How do I find errors in JSON?

Paste your JSON into a validator like FixTools. It parses the JSON and reports the exact line and character where parsing failed, along with what was expected vs what was found.

What should I do if my JSON has many errors?

Validators typically stop at the first fatal error. Fix the first reported error and revalidate — sometimes one fix reveals or resolves subsequent errors.

Can I check JSON errors in large files?

Yes. FixTools processes JSON in your browser without file size limits. Large files may take a moment to parse.

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Check JSON for Errors

Something is wrong with your JSON but you cannot see it? FixTools finds the error immediately — whether it is a trailing comma, a mismatched bracket, an unquoted key, or a stray character hiding in a large file. Paste your JSON and get the exact error location and a plain-language fix.

⚡ Use Tool Now How it works

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

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Pinpoints exact error location

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Plain-language error descriptions

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Catches all JSON syntax errors

JSON Tool

JSON Validator

All processing happens in your browser — your files are never uploaded to any server.

🚀Open JSON Validator

100% Free · No account · Works on any device

How to use this tool

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Paste the JSON you suspect has an error and click Validate to find it.

How It Works

Step-by-step guide to check json for errors:

1
Paste the JSON
Copy your JSON — from a file, an API response, or a config — and paste it into the validator.
2
Check for errors
Click Validate. FixTools scans the entire JSON and reports every error with the line number and column.
3
Fix and re-check
Correct each reported error. Re-validate until the JSON is confirmed as error-free.