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JSON Formatter
Pretty-print and validate JSON instantly
About the JSON Formatter
The JSON Formatter pretty-prints messy or minified JSON into a clean, indented structure, validates that it's syntactically correct, and can also minify it back down to a single line. It's useful for debugging API responses, reading config files, or preparing JSON for production use.
How to Format JSON
- Paste your JSON into the input box, or click Load Sample to try it out.
- Choose an indent size — 2 spaces, 4 spaces, or a tab.
- Click Format to pretty-print it, or Minify to compress it.
- Copy the output.
Key Features
- Pretty-print with adjustable indentation
- One-click minify to a single line
- Clear error messages for invalid JSON
- Output size shown alongside the result
FAQ
Does this tool validate my JSON?
Yes, if the JSON is invalid, an error message points out the problem.
Can I minify JSON as well as format it?
Yes, click Minify to compress the JSON down to a single line.
Which indent sizes are available?
2 spaces, 4 spaces, or a tab character.
Is my JSON uploaded anywhere?
No, formatting and validation happen entirely in your browser.