Developer tool
JSON Validator
Validate JSON instantly and find syntax errors directly in your browser.
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Paste JSON to validate it.
About this JSON validator
This free JSON validator helps you check whether your JSON is valid. It is useful for developers, API testing, debugging, configuration files and structured data.
How it works
Paste your JSON and click Validate. The tool checks the syntax instantly in your browser and shows whether the JSON is valid or contains an error.
Frequently asked questions
- What is JSON validation? ▾
- JSON validation checks whether your JSON text follows the correct syntax rules. Valid JSON can be parsed by any JSON parser without errors.
- What are common JSON syntax errors? ▾
- Common errors include missing or mismatched brackets, single-quoted strings instead of double-quoted, trailing commas, missing commas between items, and unquoted keys.
- Does this JSON validator send my data anywhere? ▾
- No. Validation happens entirely in your browser. Your JSON never leaves your device.
- What is the difference between a JSON validator and a JSON formatter? ▾
- A JSON validator checks whether your JSON is syntactically correct and shows any errors. A JSON formatter also reformats valid JSON with proper indentation.
- Is this JSON validator free? ▾
- Yes, completely free. No sign-up, no download and no ads. Works entirely in your browser.