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JSON Formatter & Validator
Paste JSON to beautify, minify or validate it. Errors are pinpointed by line and column. Everything runs in your browser.
About JSON formatting
JSON (JavaScript Object Notation) is the most common format for sending data between apps and APIs. Minified JSON is compact but unreadable; beautifying it adds indentation and line breaks so you can actually read and debug it. Minifying does the reverse — stripping whitespace to shrink payloads.
This tool also validates: if your JSON is malformed, it tells you what's wrong and where (line and column), which saves a lot of squinting. A common gotcha is trailing commas or single quotes — strict JSON allows neither. Everything is processed locally in your browser, so even sensitive data never leaves your device.