Beautify, minify, and validate JSON — with clear, line-level error messages — instantly in your browser.
JSON from APIs, logs, or config files often arrives minified — compressed with no whitespace — which makes it hard to read. This tool beautifies it with proper indentation, or does the reverse: strips whitespace down to the smallest valid payload for production use.
Validation uses JavaScript's native JSON parser and reports the exact line and column of any syntax error, so you can jump straight to the problem instead of guessing.
Formatting (beautifying) adds indentation and line breaks to make JSON human-readable. Minifying does the opposite — it removes all unnecessary whitespace to produce the smallest possible payload, which is useful for production APIs and reducing file size.
It catches trailing commas, single quotes instead of double quotes, unquoted object keys, missing commas between items, and mismatched or missing brackets — with the exact line and column where the problem occurs.
No. All formatting, minifying, and validation happens directly in your browser using JavaScript. Your data is never uploaded to a server or stored anywhere.
2 spaces is the most common standard, used by style guides like Prettier, ESLint, and Google. 4 spaces is traditional in Python and some older toolchains. Either is valid — it's a matter of team or personal preference.
No. Standard JSON does not support comments of any kind. If you need comments in a config file, consider a superset format like JSON5 or JSONC, or use a different file format such as YAML.