JSON Formatter
Format, validate, beautify, and minify JSON.
Overview
Formats messy or minified JSON into clean, indented, readable text, and flags errors if the JSON is invalid. Useful for inspecting API responses, config files, and anything where you need to actually read the structure. It runs in your browser, so your data is never uploaded.
How it works
The tool parses your input to confirm it is valid JSON, then re-serializes it with consistent indentation so the nesting is easy to follow. It can also minify JSON, stripping whitespace to produce the most compact form. If parsing fails, it points to the problem rather than producing output, which makes it a quick way to catch a stray comma or an unclosed bracket. Because everything happens locally, you can safely paste data that you would not want to send to a third-party server.
How to use it
- Paste your JSON into the input box.
- The tool validates it and formats it with proper indentation.
- Read or copy the cleaned-up output.
- If it is invalid, fix the error it flags and try again.
Examples
Reading an API response
Paste a one-line minified response and get an indented version where you can trace the keys and arrays.
Catching a syntax error
Drop in JSON that will not parse and let the tool point you to the spot that breaks it.
FAQ
Does it validate as well as format?
Is my data sent anywhere?
What counts as invalid JSON?
Can it handle large files?
Can it minify too?
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Open toolEmbed this tool
Paste this snippet to put the tool on your own site. It runs entirely in the visitor's browser, the same as it does here.