JSON Formatter and Validator

What Is JSON?

JSON (JavaScript Object Notation) is a text-based data format that has become the standard for data exchange on the web. Originally derived from JavaScript, JSON is now language-independent and supported by virtually every programming language. It uses two primary structures: objects (collections of key-value pairs wrapped in curly braces) and arrays (ordered lists of values wrapped in square brackets).

JSON supports six data types: strings, numbers, booleans, null, objects, and arrays. Its simplicity and readability make it the preferred choice for REST APIs, configuration files, NoSQL databases like MongoDB, and front-end/back-end communication.

How to Format JSON

Formatting (or "pretty-printing") JSON adds indentation and line breaks to make the data structure easier to read. This is especially useful when debugging API responses, reviewing configuration files, or sharing data with teammates.

1. 1. Paste your JSON into the input field above.
2. 2. Click "Format" to pretty-print with 2-space indentation.
3. 3. Use "Minify" to remove all whitespace for a compact, production-ready output.
4. 4. Toggle "Tree" view to explore nested structures visually with expandable nodes.

Common JSON Errors and How to Fix Them

JSON vs XML

Both JSON and XML are used for data exchange, but they differ in syntax, verbosity, and use cases. JSON is more compact, easier to parse in JavaScript, and has become the default for modern web APIs. XML is more verbose but supports attributes, namespaces, and schemas, making it suitable for document markup and enterprise integrations.

Frequently Asked Questions

More Free Tools