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Result will appear here.
What this tool does
Paste a JSON payload and get indentation or a minified version, plus a parse error that points to the problem instead of failing silently.
Readable JSON and a clear error. Everything runs in your browser; your text is not uploaded.
Debugging an API response, checking a config file, or preparing a compact payload.
Pasting secrets or production credentials into any online formatter.
Validate before shipping
Invalid JSON is reported rather than formatted into something that looks valid.
Pretty or compact
Switch between readable and minified output.
Browser-first
Everything runs in your browser; your text is not uploaded.
No install, no lock-in
Open the page, finish the job, and copy the result. No desktop software.
How to use
- 1
Paste your text
Add the text you want to work on.
- 2
Run the tool
Adjust the few options that matter, then start the job.
- 3
Take the result
Copy, download, or keep editing. Nothing is saved to an account.
Example
{"name":"Ada","roles":["admin","editor"]}
{ "name": "Ada", "roles": [ "admin", "editor" ] }
FAQ
JSON Formatter questions
Does it fix invalid JSON?
No. It tells you that parsing failed; use the error message to repair the syntax.
Is my text stored?
No. The text is processed in your browser.
What is the limit?
Up to 2 MB
Do I need an account?
No for the guest allowance. A free account gives 20 runs per tool per day; Pro gives 50.