JSON Formatter
Format, beautify, minify and validate JSON with clear error messages.
About the JSON Formatter
This free JSON formatter beautifies, minifies and validates JSON in your browser. Paste a compact API response to make it readable with proper indentation, or minify a config file to strip every unnecessary space before shipping it. If the JSON is invalid, the validator shows the exact parser error so you can spot the stray comma or missing bracket fast.
It's a daily helper for developers debugging APIs, editing configuration files or inspecting log payloads. Because it uses your browser's native JSON engine, even large documents format instantly and nothing you paste is ever uploaded.
Frequently asked questions
What does the JSON formatter do?
It takes messy or minified JSON and re-indents it into a clean, readable structure. It can also minify JSON back to a single line and validate it, pointing out exactly where any syntax error is.
How do I fix a JSON syntax error?
Paste your JSON and click Validate or Format. If it is invalid, the tool shows the parser's error message — usually naming the position or unexpected token — so you can find the missing comma, bracket or quote.
Can I choose the indentation?
Yes. You can format with 2 spaces, 4 spaces or tabs, depending on your project's style.
Is it safe to paste sensitive JSON here?
Yes. The JSON formatter runs entirely in your browser using the built-in JSON parser. Nothing you paste is sent to a server or stored.