JSON Validator
Check whether your JSON is valid and find the exact line and column of any error. Validation runs entirely in your browser.
How to validate JSON
- Paste your JSON into the input box.
- The validator parses it instantly and reports valid or invalid.
- If invalid, it shows the exact error with the line and column number.
- Fix the issue, then format or minify the corrected JSON.
Common JSON errors
- Trailing commas after the last item.
- Single quotes instead of double quotes.
- Unquoted keys.
- Missing or mismatched brackets and braces.
- Comments, which standard JSON does not allow.
Once valid, minify or beautify your JSON. See also how to format and validate JSON.
Frequently Asked Questions
How does the JSON validator work?
It parses your JSON and reports whether it is valid. If not, it shows the exact error message plus the line and column where parsing failed.
What counts as invalid JSON?
Common causes are trailing commas, single quotes instead of double, unquoted keys, missing brackets, comments, and wrong value types.
Is it the same as a JSON linter?
Yes — it lints and validates syntax. It confirms your JSON parses cleanly before you ship it to an API or config.
Is my data sent to a server?
No. Validation happens entirely in your browser; your JSON is never uploaded.
Can it also format the JSON?
Yes. Once valid, you can beautify it with indentation or minify it into a single line.
Does it check against a JSON Schema?
This tool validates JSON syntax, not JSON Schema. It confirms the document is well-formed JSON.