What does linting JSON mean?

Linting JSON means checking it for syntax errors that would prevent it from being parsed. JSON linting is simpler than linting code — it is a binary pass/fail based on the JSON specification.

Can I lint JSON in my CI pipeline?

Yes. For CI, use command-line tools: `python3 -m json.tool file.json > /dev/null` exits non-zero if JSON is invalid. `jq . file.json > /dev/null` does the same. FixTools is for manual quick checks in the browser.

Is JSON linting the same as JSON schema validation?

No. Linting checks syntax. Schema validation additionally checks that the data structure and types match a defined schema.

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JSON Linter Online

A JSON linter checks your JSON for errors that would cause a parse failure. Unlike code linters that flag style issues, JSON linting is primarily about syntax correctness — JSON either parses successfully or it does not. FixTools acts as an instant online JSON linter, validating your JSON and reporting any issues that would break a parser.

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Processing: In your browser
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Instant JSON lint results

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Reports exact error location

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Works for any valid JSON value

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JSON Validator

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

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How to use this tool

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Paste your JSON and click Validate to run a lint check.

How It Works

Step-by-step guide to json linter online:

1
Paste your JSON
Paste the JSON string you want to lint into the editor.
2
Run the linter
Click Validate. FixTools reports any syntax errors that would prevent parsing.
3
Fix and re-lint
Address the errors and re-run the validation until the JSON passes.