Paste JSON to format, validate, and syntax highlight instantly. Works entirely in your browser — nothing is sent to any server.
What it does: formats minified or malformed JSON into readable, indented output, validates syntax and points to the exact error location, and runs entirely client-side — your data never leaves your browser.
Formatted output will appear here
Tip: press Ctrl+Enter to format
JSON (JavaScript Object Notation) is a lightweight data format used by virtually every web API and configuration file. Raw API responses are often minified (stripped of whitespace) to save bandwidth, making them impossible to read. Our formatter pretty-prints JSON with 2-space indentation and syntax highlighting so you can read and debug it instantly.
JSON has strict syntax rules — strings must use double quotes, keys must be quoted, trailing commas are not allowed, and comments are not supported. Common errors include missing commas, unmatched brackets, and using single quotes. Our validator shows the exact error location to help you fix it.
Formatting (pretty-printing) adds indentation and line breaks to make JSON human-readable. Minifying does the opposite — it removes all whitespace to produce the smallest possible file, which is faster to transfer over networks. Use minified JSON in production APIs and formatted JSON for debugging.
No — our JSON Formatter works entirely in your browser using JavaScript. Your data never leaves your machine and is never sent to any server. This makes it safe to paste sensitive API responses, credentials, or configuration data.