JSON Formatter

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write, and it is easy for machines to parse and generate. Based on a subset of the JavaScript Programming Language, JSON has become the de facto standard for transmitting data in web applications (e.g., sending data from a server to a client so it can be displayed on a web page).

Why Format JSON?

APIs and web servers typically transmit JSON in a "minified" format. Minified JSON has all unnecessary whitespace, newlines, and indentation removed. This reduces the file size, which saves bandwidth and makes network transfers faster.

However, minified JSON is nearly impossible for humans to read or debug. If you receive a massive block of unformatted text from an API, a JSON Formatter (also known as a JSON Beautifier) restores the line breaks and structural indentation. This allows developers to clearly see the nested hierarchy of objects and arrays.

Common JSON Syntax Rules

When writing or editing JSON, it is easy to make syntax errors that will break your application. Our JSON Validator will catch these, but it helps to know the rules:

• Data is in name/value pairs: Data is structured as keys and values, separated by a colon (e.g., "name": "Sushera").
• Keys MUST be strings: Unlike standard JavaScript objects, JSON requires that all property keys be enclosed in double quotes.
• Double quotes only: JSON does not support single quotes ('). You must use double quotes (") for strings and keys.
• No trailing commas: You cannot have a comma after the last element in an object or array. This is a very common error!
• Data types: Values must be a string, number, object (JSON object), array, boolean, or null. Functions and dates are not natively supported JSON types.

How Our Tool Works

Our JSON Formatter runs entirely securely in your browser using standard JavaScript parsing engines. When you paste your data, it doesn't leave your computer.

If you select Format, we parse the text into an object and re-serialize it with consistent spacing (2 or 4 spaces). If you select Minify, we do the reverse, stripping all spacing. If there is a syntax error in your input, our tool catches the exception and provides a detailed error message, often pinpointing the exact line and character where the error occurred.