JSON Formatter
Beautify, minify & validate JSON instantly.
100% private — runs in your browser, nothing is uploaded.
How to use the JSON Formatter
- 1Paste your JSON
Paste raw, minified or messy JSON into the input box on the left.
- 2Beautify or minify
Click Beautify to indent it (2 or 4 spaces), or Minify to compress it to one line.
- 3Fix any errors
If the JSON is invalid, the exact error message appears so you can find and correct it.
- 4Copy the output
Click Copy result to grab the formatted JSON.
Examples
| Input | Output |
|---|---|
{"name":"Sam","tags":[1,2]} | {
"name": "Sam",
"tags": [
1,
2
]
} |
{ "a": 1, "b": 2 } | {"a":1,"b":2} |
Free online JSON formatter & validator
This JSON formatter beautifies, minifies and validates JSON right in your browser. Paste messy or single-line JSON and get clean, indented output that is easy to read — or minify it to the smallest possible size for production.
Features
- Beautify with 2 or 4-space indentation.
- Minify to remove all unnecessary whitespace.
- Validate — clear error messages for invalid JSON.
- One-click copy of the result.
It is ideal for developers debugging API responses, config files and logs. Because it runs locally, even sensitive JSON stays completely private.
Frequently Asked Questions
How do I format (beautify) JSON?
Paste your JSON into the input box and click Beautify. The tool re-indents it with 2 or 4 spaces so it is easy to read. Click Minify to remove all whitespace instead.
Does it validate my JSON?
Yes. If your JSON has a syntax error, the tool shows the exact error message so you can find and fix the problem quickly.
Is my JSON data safe?
Completely. Parsing and formatting happen in your browser with the built-in JSON engine. Your data is never uploaded to any server.
What is the difference between beautify and minify?
Beautify adds indentation and line breaks so JSON is easy to read. Minify removes all unnecessary whitespace to make the file as small as possible for production.
Why does my JSON show an error?
Common causes are trailing commas, single quotes instead of double quotes, missing quotes around keys, or unclosed brackets. The error message points you to the problem.
Can it format a large JSON file?
Yes. Since it runs locally in your browser, you can paste large JSON payloads and format them instantly without any size limit or upload.