JSON Formatter & Validator
Format, validate, and minify JSON data instantly in your browser.
How To Use
- Paste JSON — Paste your JSON string into the input area.
- Choose Action — Format to beautify, Minify to compress, or Validate to check syntax.
- Copy Result — Copy the formatted or minified output for use in your code.
What Is JSON?
JSON (JavaScript Object Notation) is a lightweight data format used everywhere in web development — from API responses to configuration files to database exports. Its simple structure of key-value pairs makes it easy for humans to read and machines to parse. But JSON can quickly become unreadable when minified into a single line or when dealing with deeply nested data structures containing hundreds of lines.
Format, Minify, and Validate — All in One Tool
This tool gives you three essential operations in one place. Format (Beautify) takes compressed or minified JSON and adds proper indentation, line breaks, and spacing — making it readable for debugging or editing. Minify does the opposite: it strips all whitespace to reduce file size for faster API transfers or storage efficiency. Validate checks your JSON for syntax errors and pinpoints exactly where issues like trailing commas, missing brackets, or unquoted keys occur. Having all three in one tool saves you from switching between different utilities.
Common JSON Errors and How to Fix Them
The most common JSON errors include trailing commas (JSON doesn't allow a comma after the last item in an object or array), unquoted keys (all keys must be wrapped in double quotes), and mismatched brackets or braces. Single quotes are not valid in JSON — you must use double quotes for both keys and string values. This tool's Validate function catches all these issues and shows you the exact line and character position so you can fix them quickly.
Common Use Cases for JSON Tools
Developers use JSON formatters constantly for debugging API responses, editing configuration files like package.json or tsconfig.json, preparing data for database imports, and cleaning up copy-pasted JSON from documentation or tools. Everything runs entirely in your browser — your API keys, configuration data, and sensitive payloads never leave your device.