How to use a JSON document in System.Text.Json (2023)

Article
05/26/2023

This article shows how to use a JSON Document Object Model (DOM) for random access to data in a JSON payload.

JSON DOM choices

Working with a DOM is an alternative to deserialization with JsonSerializer when:

You don't have a type to deserialize into.
The JSON you receive doesn't have a fixed schema and must be inspected to know what it contains.

System.Text.Json provides two ways to build a JSON DOM:

JsonDocument provides the ability to build a read-only DOM by using Utf8JsonReader. The JSON elements that compose the payload can be accessed via the JsonElement type. The JsonElement type provides array and object enumerators along with APIs to convert JSON text to common .NET types. JsonDocument exposes a RootElement property. For more information, see Use JsonDocument later in this article.
JsonNode and the classes that derive from it in the System.Text.Json.Nodes namespace provide the ability to create a mutable DOM. The JSON elements that compose the payload can be accessed via the JsonNode, JsonObject, JsonArray, JsonValue, and JsonElement types. For more information, see Use JsonNode later in this article.
(Video) System.Text.Json: Introduction

Consider the following factors when choosing between JsonDocument and JsonNode:

The JsonNode DOM can be changed after it's created. The JsonDocument DOM is immutable.
The JsonDocument DOM provides faster access to its data.

Use `JsonNode`

The following example shows how to use JsonNode and the other types in the System.Text.Json.Nodes namespace to:

Create a JsonNode DOM with object initializers and make changes

The following example shows how to:

Create a DOM by using object initializers.
Make changes to a DOM.

using System.Text.Json;using System.Text.Json.Nodes;namespace JsonNodeFromObjectExample;public class Program{ public static void Main() { // Create a new JsonObject using object initializers. var forecastObject = new JsonObject { ["Date"] = new DateTime(2019, 8, 1), ["Temperature"] = 25, ["Summary"] = "Hot", ["DatesAvailable"] = new JsonArray( new DateTime(2019, 8, 1), new DateTime(2019, 8, 2)), ["TemperatureRanges"] = new JsonObject { ["Cold"] = new JsonObject { ["High"] = 20, ["Low"] = -10 } }, ["SummaryWords"] = new JsonArray("Cool", "Windy", "Humid") }; // Add an object. forecastObject!["TemperatureRanges"]!["Hot"] = new JsonObject { ["High"] = 60, ["Low"] = 20 }; // Remove a property. forecastObject.Remove("SummaryWords"); // Change the value of a property. forecastObject["Date"] = new DateTime(2019, 8, 3); var options = new JsonSerializerOptions { WriteIndented = true }; Console.WriteLine(forecastObject.ToJsonString(options)); //output: //{ // "Date": "2019-08-03T00:00:00", // "Temperature": 25, // "Summary": "Hot", // "DatesAvailable": [ // "2019-08-01T00:00:00", // "2019-08-02T00:00:00" // ], // "TemperatureRanges": { // "Cold": { // "High": 20, // "Low": -10 // }, // "Hot": { // "High": 60, // "Low": 20 // } // } //} }}

Deserialize subsections of a JSON payload

The following example shows how to use JsonNode to navigate to a subsection of a JSON tree and deserialize a single value, a custom type, or an array from that subsection.

using System.Text.Json;using System.Text.Json.Nodes;namespace JsonNodePOCOExample;public class TemperatureRanges : Dictionary<string, HighLowTemps>{}public class HighLowTemps{ public int High { get; set; } public int Low { get; set; }}public class Program{ public static DateTime[]? DatesAvailable { get; set; } public static void Main() { string jsonString =@"{ ""Date"": ""2019-08-01T00:00:00"", ""Temperature"": 25, ""Summary"": ""Hot"", ""DatesAvailable"": [ ""2019-08-01T00:00:00"", ""2019-08-02T00:00:00"" ], ""TemperatureRanges"": { ""Cold"": { ""High"": 20, ""Low"": -10 }, ""Hot"": { ""High"": 60, ""Low"": 20 } }}"; // Parse all of the JSON. JsonNode forecastNode = JsonNode.Parse(jsonString)!; // Get a single value int hotHigh = forecastNode["TemperatureRanges"]!["Hot"]!["High"]!.GetValue<int>(); Console.WriteLine($"Hot.High={hotHigh}"); // output: //Hot.High=60 // Get a subsection and deserialize it into a custom type. JsonObject temperatureRangesObject = forecastNode!["TemperatureRanges"]!.AsObject(); using var stream = new MemoryStream(); using var writer = new Utf8JsonWriter(stream); temperatureRangesObject.WriteTo(writer); writer.Flush(); TemperatureRanges? temperatureRanges = JsonSerializer.Deserialize<TemperatureRanges>(stream.ToArray()); Console.WriteLine($"Cold.Low={temperatureRanges!["Cold"].Low}, Hot.High={temperatureRanges["Hot"].High}"); // output: //Cold.Low=-10, Hot.High=60 // Get a subsection and deserialize it into an array. JsonArray datesAvailable = forecastNode!["DatesAvailable"]!.AsArray()!; Console.WriteLine($"DatesAvailable[0]={datesAvailable[0]}"); // output: //DatesAvailable[0]=8/1/2019 12:00:00 AM }}

JsonNode average grade example

The following example selects a JSON array that has integer values and calculates an average value:

using System.Text.Json.Nodes;namespace JsonNodeAverageGradeExample;public class Program{ public static void Main() { string jsonString =@"{ ""Class Name"": ""Science"", ""Teacher\u0027s Name"": ""Jane"", ""Semester"": ""2019-01-01"", ""Students"": [ { ""Name"": ""John"", ""Grade"": 94.3 }, { ""Name"": ""James"", ""Grade"": 81.0 }, { ""Name"": ""Julia"", ""Grade"": 91.9 }, { ""Name"": ""Jessica"", ""Grade"": 72.4 }, { ""Name"": ""Johnathan"" } ], ""Final"": true}"; double sum = 0; int count = 0; JsonNode document = JsonNode.Parse(jsonString)!; JsonNode root = document.Root; JsonArray studentsArray = root["Students"]!.AsArray(); count = studentsArray.Count; foreach (JsonNode? student in studentsArray) { if (student?["Grade"] is JsonNode gradeNode) { sum += (double)gradeNode; } else { sum += 70; } } double average = sum / count; Console.WriteLine($"Average grade : {average}"); }}// output://Average grade : 81.92

The preceding code:

Calculates an average grade for objects in a Students array that have a Grade property.
Assigns a default grade of 70 for students who don't have a grade.
Gets the number of students from the Count property of JsonArray.

`JsonNode` with `JsonSerializerOptions`

You can use JsonSerializer to serialize and deserialize an instance of JsonNode. However, if you use an overload that takes JsonSerializerOptions, the options instance is only used to get custom converters. Other features of the options instance are not used. For example, if you set JsonSerializerOptions.DefaultIgnoreCondition to WhenWritingNull and call JsonSerializer with an overload that takes JsonSerializerOptions, null properties won't be ignored.

(Video) Try the new System.Text.Json APIs!

The same limitation applies to the JsonNode methods that take a JsonSerializerOptions parameter: WriteTo(Utf8JsonWriter, JsonSerializerOptions) and ToJsonString(JsonSerializerOptions). These APIs use JsonSerializerOptions only to get custom converters.

The following example illustrates the result of using methods that take a JsonSerializerOptions parameter and serialize a JsonNode instance:

using System.Text;using System.Text.Json;using System.Text.Json.Nodes;using System.Text.Json.Serialization;namespace JsonNodeWithJsonSerializerOptions;public class Program{ public static void Main() { Person person = new Person { Name = "Nancy" }; // Default serialization - Address property included with null token. // Output: {"Name":"Nancy","Address":null} string personJsonWithNull = JsonSerializer.Serialize(person); Console.WriteLine(personJsonWithNull); // Serialize and ignore null properties - null Address property is omitted // Output: {"Name":"Nancy"} JsonSerializerOptions options = new() { DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull }; string personJsonWithoutNull = JsonSerializer.Serialize(person, options); Console.WriteLine(personJsonWithoutNull); // Ignore null properties doesn't work when serializing JsonNode instance // by using JsonSerializer. // Output: {"Name":"Nancy","Address":null} var personJsonNode = JsonSerializer.Deserialize<JsonNode>(personJsonWithNull); personJsonWithNull = JsonSerializer.Serialize(personJsonNode, options); Console.WriteLine(personJsonWithNull); // Ignore null properties doesn't work when serializing JsonNode instance // by using JsonNode.ToJsonString method. // Output: {"Name":"Nancy","Address":null} personJsonWithNull = personJsonNode!.ToJsonString(options); Console.WriteLine(personJsonWithNull); // Ignore null properties doesn't work when serializing JsonNode instance // by using JsonNode.WriteTo method. // Output: {"Name":"Nancy","Address":null} using var stream = new MemoryStream(); using var writer = new Utf8JsonWriter(stream); personJsonNode!.WriteTo(writer, options); writer.Flush(); personJsonWithNull = Encoding.UTF8.GetString(stream.ToArray()); Console.WriteLine(personJsonWithNull); }}public class Person{ public string? Name { get; set; } public string? Address { get; set; }}

If you need features of JsonSerializerOptions other than custom converters, use JsonSerializer with strongly typed targets (such as the Person class in this example) rather than JsonNode.

Use `JsonDocument`

The following example shows how to use the JsonDocument class for random access to data in a JSON string:

double sum = 0;int count = 0;using (JsonDocument document = JsonDocument.Parse(jsonString)){ JsonElement root = document.RootElement; JsonElement studentsElement = root.GetProperty("Students"); foreach (JsonElement student in studentsElement.EnumerateArray()) { if (student.TryGetProperty("Grade", out JsonElement gradeElement)) { sum += gradeElement.GetDouble(); } else { sum += 70; } count++; }}double average = sum / count;Console.WriteLine($"Average grade : {average}");

Dim sum As Double = 0Dim count As Integer = 0Using document As JsonDocument = JsonDocument.Parse(jsonString) Dim root As JsonElement = document.RootElement Dim studentsElement As JsonElement = root.GetProperty("Students") For Each student As JsonElement In studentsElement.EnumerateArray() Dim gradeElement As JsonElement = Nothing If student.TryGetProperty("Grade", gradeElement) Then sum += gradeElement.GetDouble() Else sum += 70 End If count += 1 NextEnd UsingDim average As Double = sum / countConsole.WriteLine($"Average grade : {average}")

The preceding code:

Assumes the JSON to analyze is in a string named jsonString.
Calculates an average grade for objects in a Students array that have a Grade property.
Assigns a default grade of 70 for students who don't have a grade.
Creates the JsonDocument instance in a using statement because JsonDocument implements IDisposable. After a JsonDocument instance is disposed, you lose access to all of its JsonElement instances also. To retain access to a JsonElement instance, make a copy of it before the parent JsonDocument instance is disposed. To make a copy, call JsonElement.Clone. For more information, see JsonDocument is IDisposable.

The preceding example code counts students by incrementing a count variable with each iteration. An alternative is to call GetArrayLength, as shown in the following example:

double sum = 0;int count = 0;using (JsonDocument document = JsonDocument.Parse(jsonString)){ JsonElement root = document.RootElement; JsonElement studentsElement = root.GetProperty("Students"); count = studentsElement.GetArrayLength(); foreach (JsonElement student in studentsElement.EnumerateArray()) { if (student.TryGetProperty("Grade", out JsonElement gradeElement)) { sum += gradeElement.GetDouble(); } else { sum += 70; } }}double average = sum / count;Console.WriteLine($"Average grade : {average}");

Dim sum As Double = 0Dim count As Integer = 0Using document As JsonDocument = JsonDocument.Parse(jsonString) Dim root As JsonElement = document.RootElement Dim studentsElement As JsonElement = root.GetProperty("Students") count = studentsElement.GetArrayLength() For Each student As JsonElement In studentsElement.EnumerateArray() Dim gradeElement As JsonElement = Nothing If student.TryGetProperty("Grade", gradeElement) Then sum += gradeElement.GetDouble() Else sum += 70 End If NextEnd UsingDim average As Double = sum / countConsole.WriteLine($"Average grade : {average}")

Here's an example of the JSON that this code processes:

(Video) Array or object JSON deserialization (feat. .NET & System.Text.Json)

{ "Class Name": "Science", "Teacher\u0027s Name": "Jane", "Semester": "2019-01-01", "Students": [ { "Name": "John", "Grade": 94.3 }, { "Name": "James", "Grade": 81.0 }, { "Name": "Julia", "Grade": 91.9 }, { "Name": "Jessica", "Grade": 72.4 }, { "Name": "Johnathan" } ], "Final": true}

For a similar example that uses JsonNode instead of JsonDocument, see JsonNode average grade example.

How to search a JsonDocument and JsonElement for sub-elements

Searches on JsonElement require a sequential search of the properties and hence are relatively slow (for example when using TryGetProperty). System.Text.Json is designed to minimize initial parse time rather than lookup time. Therefore, use the following approaches to optimize performance when searching through a JsonDocument object:

Use the built-in enumerators (EnumerateArray and EnumerateObject) rather than doing your own indexing or loops.
Don't do a sequential search on the whole JsonDocument through every property by using RootElement. Instead, search on nested JSON objects based on the known structure of the JSON data. For example, the preceding code examples look for a Grade property in Student objects by looping through the Student objects and getting the value of Grade for each, rather than searching through all JsonElement objects looking for Grade properties. Doing the latter would result in unnecessary passes over the same data.

Use `JsonDocument` to write JSON

The following example shows how to write JSON from a JsonDocument:

string jsonString = File.ReadAllText(inputFileName);var writerOptions = new JsonWriterOptions{ Indented = true};var documentOptions = new JsonDocumentOptions{ CommentHandling = JsonCommentHandling.Skip};using FileStream fs = File.Create(outputFileName);using var writer = new Utf8JsonWriter(fs, options: writerOptions);using JsonDocument document = JsonDocument.Parse(jsonString, documentOptions);JsonElement root = document.RootElement;if (root.ValueKind == JsonValueKind.Object){ writer.WriteStartObject();}else{ return;}foreach (JsonProperty property in root.EnumerateObject()){ property.WriteTo(writer);}writer.WriteEndObject();writer.Flush();

Dim jsonString As String = File.ReadAllText(inputFileName)Dim writerOptions As JsonWriterOptions = New JsonWriterOptions With { .Indented = True}Dim documentOptions As JsonDocumentOptions = New JsonDocumentOptions With { .CommentHandling = JsonCommentHandling.Skip}Dim fs As FileStream = File.Create(outputFileName)Dim writer As Utf8JsonWriter = New Utf8JsonWriter(fs, options:=writerOptions)Dim document As JsonDocument = JsonDocument.Parse(jsonString, documentOptions)Dim root As JsonElement = document.RootElementIf root.ValueKind = JsonValueKind.[Object] Then writer.WriteStartObject()Else ReturnEnd IfFor Each [property] As JsonProperty In root.EnumerateObject() [property].WriteTo(writer)Nextwriter.WriteEndObject()writer.Flush()

The preceding code:

Reads a JSON file, loads the data into a JsonDocument, and writes formatted (pretty-printed) JSON to a file.
Uses JsonDocumentOptions to specify that comments in the input JSON are allowed but ignored.
When finished, calls Flush on the writer. An alternative is to let the writer auto-flush when it's disposed.

Here's an example of JSON input to be processed by the example code:

{"Class Name": "Science","Teacher's Name": "Jane","Semester": "2019-01-01","Students": [{"Name": "John","Grade": 94.3},{"Name": "James","Grade": 81.0},{"Name": "Julia","Grade": 91.9},{"Name": "Jessica","Grade": 72.4},{"Name": "Johnathan"}],"Final": true}

The result is the following pretty-printed JSON output:

{ "Class Name": "Science", "Teacher\u0027s Name": "Jane", "Semester": "2019-01-01", "Students": [ { "Name": "John", "Grade": 94.3 }, { "Name": "James", "Grade": 81.0 }, { "Name": "Julia", "Grade": 91.9 }, { "Name": "Jessica", "Grade": 72.4 }, { "Name": "Johnathan" } ], "Final": true}

JsonDocument is IDisposable

JsonDocument builds an in-memory view of the data into a pooled buffer. Therefore the JsonDocument type implements IDisposable and needs to be used inside a using block.

(Video) 40% faster JSON serialization with Source Generators in .NET 6

Only return a JsonDocument from your API if you want to transfer lifetime ownership and dispose responsibility to the caller. In most scenarios, that isn't necessary. If the caller needs to work with the entire JSON document, return the Clone of the RootElement, which is a JsonElement. If the caller needs to work with a particular element within the JSON document, return the Clone of that JsonElement. If you return the RootElement or a sub-element directly without making a Clone, the caller won't be able to access the returned JsonElement after the JsonDocument that owns it is disposed.

Here's an example that requires you to make a Clone:

public JsonElement LookAndLoad(JsonElement source){ string json = File.ReadAllText(source.GetProperty("fileName").GetString()); using (JsonDocument doc = JsonDocument.Parse(json)) { return doc.RootElement.Clone(); }}

The preceding code expects a JsonElement that contains a fileName property. It opens the JSON file and creates a JsonDocument. The method assumes that the caller wants to work with the entire document, so it returns the Clone of the RootElement.

If you receive a JsonElement and are returning a sub-element, it's not necessary to return a Clone of the sub-element. The caller is responsible for keeping alive the JsonDocument that the passed-in JsonElement belongs to. For example:

public JsonElement ReturnFileName(JsonElement source){ return source.GetProperty("fileName");}

`JsonDocument` with `JsonSerializerOptions`

You can use JsonSerializer to serialize and deserialize an instance of JsonDocument. However, the implementation for reading and writing JsonDocument instances by using JsonSerializer is a wrapper over the JsonDocument.ParseValue(Utf8JsonReader) and JsonDocument.WriteTo(Utf8JsonWriter). This wrapper does not forward any JsonSerializerOptions (serializer features) to Utf8JsonReader or Utf8JsonWriter. For example, if you set JsonSerializerOptions.DefaultIgnoreCondition to WhenWritingNull and call JsonSerializer with an overload that takes JsonSerializerOptions, null properties won't be ignored.

The following example illustrates the result of using methods that take a JsonSerializerOptions parameter and serialize a JsonDocument instance:

using System.Text;using System.Text.Json;using System.Text.Json.Nodes;using System.Text.Json.Serialization;namespace JsonDocumentWithJsonSerializerOptions;public class Program{ public static void Main() { Person person = new Person { Name = "Nancy" }; // Default serialization - Address property included with null token. // Output: {"Name":"Nancy","Address":null} string personJsonWithNull = JsonSerializer.Serialize(person); Console.WriteLine(personJsonWithNull); // Serialize and ignore null properties - null Address property is omitted // Output: {"Name":"Nancy"} JsonSerializerOptions options = new() { DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull }; string personJsonWithoutNull = JsonSerializer.Serialize(person, options); Console.WriteLine(personJsonWithoutNull); // Ignore null properties doesn't work when serializing JsonDocument instance // by using JsonSerializer. // Output: {"Name":"Nancy","Address":null} var personJsonDocument = JsonSerializer.Deserialize<JsonDocument>(personJsonWithNull); personJsonWithNull = JsonSerializer.Serialize(personJsonDocument, options); Console.WriteLine(personJsonWithNull); }}public class Person{ public string? Name { get; set; } public string? Address { get; set; }}

If you need features of JsonSerializerOptions, use JsonSerializer with strongly typed targets (such as the Person class in this example) rather than JsonDocument.

(Video) Using JSON IN C#! Serialization & Deserialization made easy!

FAQs

How to read a JSON file in C#? ›

How to read a JSON file in C#

Analyze the JSON object.
Define the corresponding C# model.
Read the JSON file and create the C# object.

Read On ›

How to store JSON data in text file C#? ›

First, we serialize the object to a string using JsonSerializer. Serialize method for the native version and JsonConvert. SerializeObject for Newtonsoft. Then, we write this string to file using File.

Get More Info ›

How to convert object into JSON in C#? ›

Using Newtonsoft Json.NET to Serialize C# Objects

SerializeObject(obj); var jsonString = JsonConvert. SerializeObject(obj); Here, we turn an object into a JSON string by calling the SerializeObject() static method of the JsonConvert object.

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How to read JSON file using Newtonsoft? ›

To read and parse a JSON file into a . NET object with Newtonsoft. Json , we can use the JsonConvert. DeserializeObject() method, which is a part of the Newtonsoft.

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How to read a JSON object from a file? ›

JSONParser parser = new JSONParser();
Object obj = parser. parse(new FileReader("myJSON.json"));
JsonObject jasonObject = (JsonObject)obj;

Feb 16, 2023

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How do I read a JSON file and parse it? ›

Use the JavaScript function JSON.parse() to convert text into a JavaScript object: const obj = JSON.parse('{"name":"John", "age":30, "city":"New York"}'); Make sure the text is in JSON format, or else you will get a syntax error.

Read The Full Story ›

How do you read a JSON file and store it in a string? ›

We use the readAllBytes() method of the Files class to read bytes data of the JSON files as a string. We store the returned result of the readAllBytes()and get()methods into a variable and return it to the main() method.

Get More Info Here ›

What is the best way to store JSON documents? ›

LOB storage - JSON documents can be stored as-is in NVARCHAR columns. This is the best way for quick data load and ingestion because the loading speed matches the loading speed of string columns.

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How to store JSON response in a file? ›

To write a JSON Object to a local file, following is a step-by-step guide :

Stringify JSON Object. UseJSON. stringify(jsonObject) to convert JSON Object to JSON String.
Write the stringified object to file using fs. writeFile() function of Node FS module.

Read On ›

How to convert JSON object into string? ›

Use the JavaScript function JSON.stringify() to convert it into a string. const myJSON = JSON.stringify(obj); The result will be a string following the JSON notation.

How to convert object into JSON data? ›

To convert a JavaScript object to JSON, you can use the JSON. stringify(value, replacer, space) method. The JSON. stringify() method serializes objects, arrays, and primitive values into a JSON data string.

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What is the easiest way to read a JSON file? ›

Programs that open JSON files

File Viewer for Android. Google Chrome. Mozilla Firefox.
File Viewer Plus. Microsoft Notepad. Included with OS. Microsoft WordPad. Included with OS. ...
Apple TextEdit. Included with OS. MacVim. GitHub Atom — Discontinued. ...
Linux. Vim. Pico. GNU Emacs. ...
iOS. Google Chrome. Mozilla Firefox.
Chrome OS. Google Chrome.

Feb 1, 2021

How to read data from database in JSON? ›

If you have JSON text that's stored in database tables, you can read or modify values in the JSON text by using the following built-in functions: ISJSON (Transact-SQL) tests whether a string contains valid JSON. JSON_VALUE (Transact-SQL) extracts a scalar value from a JSON string.

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How do I convert a JSON file to readable? ›

How do I convert a JSON file to readable?

Open JSON to Text tool and Copy and Paste JSON Code in Input Text Editor.
If you do have a JSON data file, you can upload the file using the Upload file button. ...
Click on JSON to Text button once data is available in Input Text Editor, via Paste, File, or URL.

More items...

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How to extract data from JSON format? ›

To extract the name and projects properties from the JSON string, use the json_extract function as in the following example. The json_extract function takes the column containing the JSON string, and searches it using a JSONPath -like expression with the dot . notation.

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How do I read a JSON file in notepad? ›

With the plugin installed, open the JSON file you want to format in Notepad++. Go to the Plugins menu and select the JSON Viewer option. This will open a new window that displays the JSON code with proper indentation and color-coded syntax highlighting to make it easier to read and edit.

How to read the JSON response? ›

We can parse a JSON response and get a particular field from Response in Rest Assured. This is done with the help of the JSONPath class. To parse a JSON response, we have to first convert the response into a string. To obtain the response we need to use the methods - Response.

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How to read JSON files from a folder? ›

Python – Read all JSON files in directory

Use os. listdir() function to get all the files at given directory path.
Use string. endswith() function to check if the extension of the file is . json .

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How to read JSON with Excel? ›

Go to the Data tab in an Excel Workbook. Click on From File and then choose JSON. Now, choose the JSON file from your system and select OPEN. This will open the JSON file in Excel and now you can view the data.

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How do I read a file and store it in a string? ›

All we have to do is append these to a StringBuilder object with newline character. Below is the code snippet to read the file to String using BufferedReader. BufferedReader reader = new BufferedReader(new FileReader(fileName)); StringBuilder stringBuilder = new StringBuilder(); String line = null; String ls = System.

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How data is stored and retrieved from JSON object? ›

Data is stored in a set of key-value pairs. This data is human readable, which makes JSON perfect for manual editing. From this little snippet you can see that keys are wrapped in double quotes, a colon separates the key and the value, and the value can be of different types. Key-value sets are separated by a comma.

How to read or fetch the JSON array inside JSON object? ›

String value = (String) jsonObject. get("key_name"); Just like other element retrieve the json array using the get() method into the JSONArray object.

Learn More Now ›

Why is storing your file in a JSON format useful? ›

JSON is a text-based format that is easy for humans to read and write, and it is also easy for computers to parse and generate. JSON storage is popular in web development because many web applications are built using JavaScript, which can easily manipulate JSON data.

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Can a JSON file be used to store data? ›

JSON is perfect for storing temporary data. For example, temporary data can be user-generated data, such as a submitted form on a website. JSON can also be used as a data format for any programming language to provide a high level of interoperability.

What is the drawback of JSON documents? ›

Limitations of JSON format

No error handling - JSON has no error handling mechanism for JSON calls. ...
No comments - These two words are enough to make the developer's life difficult.
Security - JSON can be dangerous if used with untrusted browsers or services.

More items...

Find Out More ›

How do I save a JSON file in notepad? ›

In Notepad++ on the Language menu you will find the menu item - 'J' and under this menu item chose the language - JSON. Once you select the JSON language then you won't have to worry about how to save it. When you save it it will by default save it as . JSON file, you have to just select the location of the file.

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How to set response in JSON format? ›

For the server to respond in JSON format, include the JSON data in the response message body and specify the "Content-Type: application/json" HTTP header. The server may also set the Content-Length header to indicate the length of the JSON data in the response.

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Can I store JSON in local storage? ›

In summary, we can store JavaScript objects in localStorage by first converting them to strings with the JSON. stringify method, then back to objects with the JSON.

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How to convert JSON response to string? ›

In Java, the JSONObject class provided by the org. json package is commonly used to create and manipulate JSON objects. The JSONObject. toString() method is a useful method provided by this class that converts a JSON object to a string representation.

Learn More Now ›

What is the difference between JSON parse and JSON Stringify? ›

JSON. stringify() : This method takes a JavaScript object and then transforms it into a JSON string. JSON. parse() : This method takes a JSON string and then transforms it into a JavaScript object.

What does JSON parse? ›

JSON parsing is the process of converting a JSON object in text format to a Javascript object that can be used inside a program. In Javascript, the standard way to do this is by using the method JSON. parse() , as the Javascript standard specifies.

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How to convert a JSON string to JSON object in React? ›

Conclusion:

Convert JSON string to object using JSON. parse()
Convert a data object into JSON string with JSON. stringify()
Create React App can automatically convert a json to object when you import a . json file.

Mar 8, 2022

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How to convert string to array of JSON objects? ›

The eval( ) function in javascript is a global function that is used to evaluate a string as an expression. To convert the JSON string to array of JSON objects using the eval function we pass the JSON string into it and the function returns the JSON object.

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How to convert JSON string to user defined object in Java? ›

We can convert a JSON to Java Object using the readValue() method of ObjectMapper class, this method deserializes a JSON content from given JSON content String.

Tell Me More ›

How to convert JSON object to text file? ›

Steps to Convert JSON String to TEXT File using Python

Step 1: Prepare the JSON string. Let's review a simple example, where we'll create a JSON string based on the data below: ...
Step 2: Create the JSON file. ...
Step 3: Install the Pandas Package. ...
Step 4: Convert the JSON String to TEXT using Python.

Keep Reading ›

Which method is used to convert an object data into JSON format? ›

toJson() method to convert that object into a JSON object.

How to convert an object to string? ›

In Java, you can convert an object to a string using the toString() method, which is a method of the Object class. This method returns a string that represents the object. We can also use the String. valueOf() method to convert an object to a string in Java.

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How to read the JSON array in C#? ›

To get data from a JSON array inside a JSON object in C#, you can use the Newtonsoft. Json library (also known as Json.NET) and the JObject and JArray classes. If the JSON array only contains primitive values (i.e., strings, numbers, booleans, etc.)

See Details ›

How to read JSON to XML in C#? ›

Click Tools=> NuGet Package Manager=> Package Manager Console. Type “PM> Install-Package Newtonsoft. Json”. DeserializeXmlNode() is the helper method to convert JSON to XML.

Show Me More ›

How to read csv file in JSON in C#? ›

Convert CSV to JSON in C#

Prepare the load options for loading the CSV file.
Load the CSV using the Converter class.
Set the conversion format to JSON using DataConvertOptions.
Call the Convert method to get the CSV data transformed into JSON format.

Jun 18, 2021

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How to read JSON response from REST API in C#? ›

To get JSON from a REST API endpoint using C#/. NET, you must send an HTTP GET request to the REST API server and provide an Accept: application/json request header. The Accept: application/json header tells the REST API server that the API client expects to receive data in JSON format.

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How to access a JSON object in an array? ›

To access the JSON object in JavaScript, parse it with JSON. parse() , and access it via “.” or “[]”.

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How to read data from JSON array? ›

String value = (String) jsonObject. get("key_name"); Just like other element retrieve the json array using the get() method into the JSONArray object.

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How to convert JSON file into XML? ›

JSON to XML Converter

Select the JSON to XML action from the Tools > JSON Tools menu. ...
Choose or enter the Input URL of the JSON document.
Choose the path of the Output file that will contain the resulting XML document.
Select the Open in Editor option to open the resulting XML document in the main editing pane.

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How to read data from XML file to DataSet in C#? ›

Load Xml Document in Dataset

class Program.
public static void Main(string[] args)
string xmlDoc = @"<? xml version='1.0'?>
StringReader sr = new StringReader(xmlDoc);
DataSet ds = new DataSet();
foreach (DataColumn dc in ds.Tables[0].Columns)
Console.Write("{0,15}", dc.ColumnName);
Console.Write("\n");

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Oct 4, 2013

How to convert JSON data to DataTable in C#? ›

First, we check if the JSON string is null or consists of only whitespaces, if it is, we return an empty DataTable . Then, if the string is not empty, we use the JsonConvert. DeserializeObject<DataTable>() method from the Newtonsoft. Json library to deserialize it to a DataTable .

How to read JSON file and convert to CSV? ›

Steps to Convert a JSON String to CSV using Python

Step 1: Prepare a JSON String. To start, prepare a JSON string that you'd like to convert to CSV. ...
Step 2: Create the JSON File. ...
Step 3: Install the Pandas Package. ...
Step 4: Convert the JSON String to CSV using Python.

How do I open a JSON file in CSV? ›

Convert Large JSON To CSV In Excel

Select Data > Get Data > From File > From JSON. The Import Data dialog box appears.
Search the JSON file, and then select Open.

How to put JSON data into CSV? ›

Use Pandas to Convert JSON to CSV

Import Pandas. Import Pandas using import pandas as pd.
Load the JSON string as a Pandas DataFrame. Load the DataFrame using pd.read_json(json_string)
Convert the DataFrame to a CSV file. Use the df.

Oct 31, 2022

Learn More Now ›

Videos

1. Learn JSON in 10 Minutes

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2. Polymorphic JSON Serialization (feat. .NET & System.Text.Json)

(Coding Militia)

3. Comparing Newtonsoft.Json with the new System.Text.Json API - .NET Quick Hits

(Spencer Schneidenbach)

4. The fastest way to work with JSON in .NET

(Nick Chapsas)

5. System.Text.Json & DeserializeAsync:

(Bugs In Cloud)

6. Fix: System.Text.Json.JsonException : A Possible Object Cycle was detected

(ASP.NET MVC)

How to use a JSON document in System.Text.Json (2023)

JSON DOM choices

Use `JsonNode`

Create a JsonNode DOM with object initializers and make changes

Deserialize subsections of a JSON payload

JsonNode average grade example

`JsonNode` with `JsonSerializerOptions`

Use `JsonDocument`

How to search a JsonDocument and JsonElement for sub-elements

Use `JsonDocument` to write JSON

JsonDocument is IDisposable

`JsonDocument` with `JsonSerializerOptions`

See also

FAQs

How to read a JSON file in C#? ›

How to convert object into JSON data? ›

How data is stored and retrieved from JSON object? ›

What does JSON parse? ›

How to read JSON response from REST API in C#? ›

Videos

References

How to use a JSON document in System.Text.Json (2023)

JSON DOM choices

Use JsonNode

Create a JsonNode DOM with object initializers and make changes

Deserialize subsections of a JSON payload

JsonNode average grade example

JsonNode with JsonSerializerOptions

Use JsonDocument

How to search a JsonDocument and JsonElement for sub-elements

Use JsonDocument to write JSON

JsonDocument is IDisposable

JsonDocument with JsonSerializerOptions

See also

FAQs

How to read a JSON file in C#? ›

How to convert object into JSON data? ›

How data is stored and retrieved from JSON object? ›

What does JSON parse? ›

How to read JSON response from REST API in C#? ›

Videos

References

Use `JsonNode`

`JsonNode` with `JsonSerializerOptions`

Use `JsonDocument`

Use `JsonDocument` to write JSON

`JsonDocument` with `JsonSerializerOptions`