JSON Formatter

Is it safe to paste real API keys or sensitive data here?

Completely safe. All formatting happens in your browser using JavaScript — nothing is sent to any server. You can verify this yourself by opening your browser's Network tab while using the tool. No account needed, no logging.

What's the size limit?

There's no hard limit from the tool itself. It depends on your browser's available memory. JSON files up to 10-15 MB generally work without issues in Chrome and Firefox. For very large files (hundreds of MBs), a command-line tool like jq is more practical.

Why would I need to minify JSON?

Minified JSON has all whitespace stripped — no line breaks, no spaces, just the raw data. That makes it smaller to send over a network, cheaper to store in a database field, and safe to embed in a URL. The Minify button does this instantly on the current output. There's also a dedicated JSON Minifier page if that's your primary use case.

Why does the output say "Invalid JSON"?

The input has a syntax error. Common causes include trailing commas after the last element, single quotes instead of double quotes, unquoted property names, or mismatched brackets. The JSON spec is strict about all of these.

Can this validate JSON against a schema?

This tool validates syntax (whether the JSON is well-formed), not structure. For schema validation, use the JSON Schema Generator to generate a schema from sample data, or the JSON Validator for more detailed checks.