Format, validate, and minify JSON instantly. Catch syntax errors and beautify messy output — all in your browser.
Paste your JSON to instantly format, validate, and minify it. Beautifully indent messy JSON, catch syntax errors before they break your code, and compress JSON for production payloads — all in your browser, no data sent anywhere.
Paste or type your JSON into the editor. The formatter parses it with a standards-compliant JSON parser, re-serializes it with 2-space indentation, and highlights any syntax error with a line and column pointer. Toggle minify mode to strip all whitespace for compact output. All processing is client-side — your data never leaves your browser.
JSON formatting (or "pretty-printing") adds consistent indentation and line breaks to minified or messy JSON so it is readable by humans. Standard formatting uses 2 spaces per nesting level, but you can also use 4 spaces or tabs.
JSON does not allow trailing commas, single quotes, comments, or unquoted keys. The formatter points you to the exact line and column where the parser stopped, so you can fix the issue quickly.
Minify removes all unnecessary whitespace — spaces, tabs, newlines — from valid JSON, producing the smallest possible string. This reduces payload size for API requests and responses, improving transfer speed.
No. All formatting, validation, and minification happens entirely in your browser using JavaScript. Your data is never uploaded or stored on any server.
