Prettify JSON online with clean indentation, validation feedback and one-click copy.
If you have ever written JSON.stringify(value, null, 2) in JavaScript or json.dumps(data, indent=2) in Python, you have used the prettify operation in code. This online tool is the same idea moved into the browser so you can prettify ad-hoc JSON without writing a script. Internally it parses with the standard JSON parser and re-serializes with a fixed indent, exactly how the language built-ins behave.
Prettifying is usually the first step in a longer cleanup. After prettifying, sorting object keys with JSON Sorter makes diffs deterministic — two responses with the same content but different key order will look identical, which is the behavior you want when a flaky API shuffles keys between requests.
If you are comparing two responses, prettify both, sort both, then paste them into JSON Compare to see only the structural differences.
If jq is already in your terminal, jq '.' is a great prettifier. The browser tool wins when you want to share a URL with someone, when you need to prettify a single payload without leaving your browser, or when the input is broken JSON that would make jq fail. AI JSON Repair plus the prettifier on this site handle messy input that jq refuses to parse.
Input
{"level":"info","msg":"request handled","ctx":{"path":"/users","status":200,"ms":42}}Output
{
"level": "info",
"msg": "request handled",
"ctx": {
"path": "/users",
"status": 200,
"ms": 42
}
}Logs typically print JSON on one line. Prettifying turns each request into something you can scan in a review.
Repair common JSON syntax errors such as trailing commas, comments, single quotes, missing quotes and unmatched brackets.
JSON guideGuideRemove trailing commas from JSON objects and arrays so strict JSON parsers can read the data.
JSON guideGuideFormat JSON online into readable indentation and copy clean output for APIs, configs and docs.
JSON guideGuideUse a free online JSON formatter with no signup for quick developer copy-and-paste workflows.
JSON guideGuideBeautify minified JSON into readable, indented output for debugging and documentation.
JSON guideGuideLint JSON online by validating syntax and identifying parse errors before using data in code.
JSON guideGuidePrettified JSON is JSON printed with line breaks and indentation so nested structure is visible to a human.
It makes nested data easier to inspect, easier to share in a code review, and easier to compare against another response.
Yes, as long as the JSON portion is extracted and is valid (or repaired first with AI JSON Repair).
Yes. The output matches the standard library behavior for two-space indentation.
The default is two spaces, which matches JS and Python convention. Different indent widths can be added later.