JSON Formatter & Validator

How to use the JSON Formatter

1. Paste your raw or minified JSON into the input box on the left.
2. Click Format to beautify with 2-space indentation, or Minify to compress it to a single line.
3. Click Validate to check syntax without modifying the JSON.
4. Click Copy to copy the output to your clipboard.

Format, minify, or validate, what is the difference?

Formatting (also called beautifying or pretty-printing) adds consistent indentation and line breaks. It does not change the data, only the whitespace. The result is human-readable JSON that is easy to navigate and debug.

Minifying removes all unnecessary whitespace: spaces, tabs, and newlines. A minified JSON file is smaller and faster to transmit over a network. API responses are usually minified for this reason.

Validating checks whether the JSON is syntactically correct according to the JSON specification (RFC 8259). An error message pinpoints the exact position of the problem, missing comma, unterminated string, trailing comma, unquoted key, so you can fix it quickly.

Common JSON errors

• Trailing comma: {"a":1,} is invalid JSON (though valid in JavaScript). Remove the last comma.
• Unquoted keys: {a:1} is not JSON. Keys must be double-quoted: {"a":1}.
• Single quotes: JSON requires double quotes for strings. Single quotes are not allowed.
• Comments: JSON has no comment syntax. Remove any // or /* */ lines before validating.
• NaN / Infinity: these JavaScript values are not valid JSON. Use null instead.

When to use each action

• Use Format when reading an API response, reviewing a config file, or debugging data.
• Use Minify before embedding JSON in source code, sending it over a network, or storing it in a system where size matters.
• Use Validate when an API rejects your request or a parser throws an unexpected error, first confirm the JSON itself is valid.

Privacy

All processing happens entirely in your browser. Your JSON never leaves your device, nothing is sent to a server, stored, or logged.