UtilityBaseDeveloper Tools
JSON Formatter
Format, validate, and minify JSON with precise error locations.
Updated February 18, 2026
How to use the json formatter
- 1Paste JSON into the input.
- 2Click Format (choose 2 or 4 spaces) or Minify.
- 3If the JSON is invalid, fix the reported line and column and retry.
- 4Copy the output.
Common uses
- Read minified API responses and log payloads.
- Validate configuration files before deploying.
- Minify JSON for compact storage.
Frequently asked questions
Where is my JSON processed?
Entirely in your browser with the native JSON parser. Nothing is uploaded — appropriate for logs and payloads containing internal data.
What do the error messages mean?
The validator reports the first syntax problem with its line and column. The usual culprits: trailing commas, single quotes instead of double quotes, unquoted keys, and comments — none of which are valid JSON.
What's the difference between formatting and minifying?
Formatting adds indentation and line breaks for reading. Minifying strips all insignificant whitespace to make the payload as small as possible for storage or transmission. Both produce equivalent JSON.
Does the formatter change my data's key order?
No — keys are kept in their original order. Only whitespace changes.
About this tool
The JSON formatter pretty-prints minified JSON with your choice of indentation, minifies formatted JSON back down for transport, and validates syntax with the exact position of the first error so malformed payloads are quick to fix. Paste a response from a log or API, format it, and read the structure comfortably. Parsing happens locally in your browser — safe for payloads you'd rather not paste into a random website's server.
Like everything on UtilityBase, the json formatter runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more developer tools here.
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