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What do you need to get done?
- Stays on this device
- No watermark
- Works offline
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JSON formatter
Format JSON online: paste messy or one-line JSON and get it back indented and readable, with 2 spaces, 4 spaces or tabs. Big numbers keep every digit, and an error tells you the line and column. Free, and nothing leaves your browser.
How to format JSON
- 1Paste your JSON or drop a .json file
- 2Leave the action on "Format" and pick the indent
- 3Copy the result or save it as formatted.json
- Indented JSON, ready to read or paste.
What you get
- Nothing is uploaded.Your JSON is parsed and formatted by your browser, so API responses and configs stay with you.
- Numbers stay exact.12345678901234567890 and 1.50 come out as written, not rounded.
- Errors point to the spot.You see the line and column, and the line itself with a mark under the problem.
What you can do
- Indent with 2 spaces, 4 spaces or a tab.
- Switch the action to "Sort keys", "Minify (one line)" or "Validate" without leaving the page.
- Paste text or drop a text file into the input.
- The result updates as you type, and you can copy it or save it as a file.
Good to know
- Output follows the order of keys in your input. Use "Sort keys" if you want them alphabetical.
- JSON must be strict: no comments, no trailing commas, double quotes only.
- The tool works in the page, so a very large file depends on the memory of your device.
Questions
Is my JSON sent to a server?
No. It is parsed and formatted in your browser. Nothing is uploaded.
Why does my JSON show an error?
The message names the line and column. Common causes are a trailing comma, single quotes or a missing bracket.
Does it change large numbers like IDs?
No. A number that plain JavaScript would round, such as 12345678901234567890, is printed exactly as you wrote it.
Can I use tabs instead of spaces?
Yes. Choose "Tab" in the Indent list.