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JSON Validator

Validate JSON against syntax rules with detailed error messages showing line, column and the specific problem. Optional schema validation.

JSON input

{"name": "Alice", "age": 30}

✓ Valid JSON

Bytes

Top-level depth

Total keys

Validation runs in your browser using JSON.parse.

How to use JSON Validator

1Paste your input in the panel above or use the example data if available.
2Choose an action — format, generate, convert, encode, or analyze.
3Your result appears instantly. Use Copy to grab it, or Download if a file option is shown.

Runs entirely in your browser

Nothing you type, paste, generate, or upload leaves your device.

Format and validate JSON instantly.

Compare two JSON documents.