JSON Formatter
Paste JSON to format it with clean, consistent indentation. Invalid input is flagged with an error message, and everything runs locally in your browser.
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About the JSON Formatter
This tool takes raw or compact JSON and re-prints it with consistent indentation so nested objects and arrays become easy to read. As it formats, it also parses the input, so any syntax problem is reported instead of producing broken output. It is handy for inspecting API responses, config files, or log lines where the JSON arrived as one long string.
How to use it
- Paste your JSON into the input box.
- The formatted, indented result appears automatically.
- If the input is invalid, an error message tells you what went wrong.
- Copy the tidied output back into your editor or ticket.
A common use is cleaning up a minified API payload before debugging it. Note that formatting normalizes whitespace only - it never changes keys, values, or the order of object members, so the data stays identical. Because everything runs in your browser with JSON.parse and JSON.stringify, your data is never uploaded to a server.
Frequently asked questions
Does the JSON formatter change my data?
No. It only re-indents and re-spaces the text. Keys, values, types, and member order are preserved exactly, so the parsed result is identical to your input.
What indentation does it use?
The output is pretty-printed with standard two-space indentation, which is the most common convention for JSON and is easy to read in any editor.
Can it format JSON with comments or trailing commas?
No. Standard JSON does not allow comments or trailing commas, so such input is reported as invalid. Remove them first, or use the JSON Validator to locate the problem.
Is my JSON sent anywhere?
No. Formatting happens entirely in your browser using the built-in JSON engine. Nothing is uploaded or stored.