Online JSON Formatter & Validator

Quickly and easily convert JSON data strings to an easy-to-read format and validate JSON errors. The Online JSON Formatter and Validator includes a best-in-class JSON code editor with advanced JSON syntax highlighting, a JSON lint error checker, and a JSON code reformatter


JSON Formatter Features

Convert complex and minified JSON data strings to a human-readable format and detect JSON errors with free ReqBin JSON formatting and linting tool. View both the source JSON code and the result of formatting in a convenient two-pane view.

  • JSON syntax highlighting
  • JSON linting and validation
  • Support for Google Chrome, Mozilla Firefox, Apple Safari, Microsoft Edge browsers
  • Clean UI and easy to use
  • Two-pane view
  • It's free

About Online JSON Formatter and Validator

ReqBin Online JSON Formatter and Validator is an easy-to-use online tool for formatting and validating JSON strings in the browser. When formatting and validating JSON, requests are not sent to the server, making JSON formatting safe and fast. Copy and paste the JSON string into the JSON Formatter source field and click on the Format JSON button to format JSON. ReqBin JSON Formatter will show formatted JSON in the right pane. If your JSON contains any errors, the online JSON Validator will flag the line with the error in the editor and provide a detailed error description for each error it encounters.

What is JSON?

JSON (JavaScript Object Notation) is an open and lightweight format that uses human-readable text to structure, store, and transmit data over a network. JSON is independent of the programming language of your system and is easy to parse into logical syntactic components, even though it is derived from JavaScript.JSON is a widely used data format that is often used to store and transfer data objects, for example, for client/server interactions. JSON is an informative and easy-to-understand format. The MIME type for JSON is application/json. JSON files use the .json filename extension.

Why format and validate JSON?

JSON is primarily used for transferring data over the network, and many servers minify it to save bandwidth. This does not affect the data in the JSON file, but it makes the JSON code unreadable to humans. Also, when generating or minimizing a JSON file, servers may sometimes generate incorrect JSON, leading to data corruption and causing API clients and servers to work incorrectly. Finding an error in JSON data string can be difficult and time-consuming. When formatting JSON manually, you may inadvertently break JSON and break your application. Therefore, it becomes mandatory to format the JSON code with a JSON formatter, which allows you to display the code in a tree and form view and see errors in the JSON. The best solution to troubleshoot JSON errors and save time is to use an online tool that formats JSON and indicates errors, such as ReqBin Online JSON Formatter and Validator.

How to format JSON Online?

To format your JSON string online, paste it into the Source JSON field and click on the Format JSON button. The formatted JSON appears in the Formatted JSON box. If your JSON contains any errors, the online JSON formatter will highlight the error line and provide a detailed description of the error on the left side of the source JSON.

Why format JSON online?

ReqBin Online JSON Formatter and Validator is easy to use and runs smoothly without errors. Online JSON Formatter does not require any software installed on your computer or a browser plug-in and works directly in your browser. JSON Formatter is a fast and secure online application that can save you time troubleshooting hard-to-find JSON issues.

How does the JSON formatter and validator works?

ReqBin Online JSON Formatter and Validator is an online JSON editor and validator that runs entirely in the browser without sending any requests to the backend server. ReqBin JSON Formatter uses best-in-class JavaScript libraries to beautify and validate JSON data strings. ReqBin JSON Validator will validate your JSON content against JSON standards, informing you of every possible error. Using ReqBin, you can quickly find any errors that may have occurred, saving you time and focusing more on your work.

Online JSON Formatter Example

Below is an example of the original JSON and the formatted result.

Original JSON Example
{"Id": 78912,"Customer":"Jason Sweet","Quantity": 1,"Price": 18.00}

And an example of how the online JSON formatter works.

Formatted JSON Result
   "Id": 78912,
   "Customer":"Jason Sweet",
   "Quantity": 1,
   "Price": 18.00

JSON Format Rules

JSON is derived from JavaScript, but no JavaScript knowledge is required to use it. When creating JSON, certain rules must be followed:

  • Data is represented by name/value pairs.
  • Commas separate data.
  • Objects are enclosed in opening and closing curly braces {}.
  • Arrays are enclosed in opening and closing square brackets [].
  • Boolean values are represented using the literals true or false in lowercase.
  • Dates and similar object types are not supported properly and must be converted to strings.
  • Numeric values are in double precision floating point format and must not have leading zeros.
  • Null values are represented by a lowercase null literal.
  • The standard extension for a JSON file is ".json".
  • The MIME type for JSON files is application/json.

How to pretty print JSON data?

Well-formatted JSON is easy for humans to read but usually takes up more disk space. You can programmatically print JSON data in different programming languages. Learn how to pretty-print JSON in JavaScript and Python.

Online XML Formatter and Validator

If you need to format XML data strings, you can use our XML Formatter, which provides the same feature set as JSON Formatter but for XML strings.