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Validate your JSON syntax instantly. Get detailed error messages with line numbers and statistics about your JSON structure.
Features
Validate your JSON instantly with detailed error messages showing exact line and column numbers.
Get insights about your JSON structure including key count, nesting depth, and data size.
Auto-format your JSON with proper indentation using the built-in beautify feature.
Guide
This JSON validator checks whether your JSON follows the official syntax rules for JavaScript Object Notation. Paste, type, or upload JSON to find parse errors, see the line where validation fails, and format valid JSON into readable indentation. It is useful for API responses, configuration files, structured logs, test fixtures, and exported data.
Validating JSON before using it in your application helps catch errors early, prevents runtime crashes, and ensures data integrity. Whether you're working with API responses, configuration files, or data exports, validation is an essential step in any JSON workflow.
Remove commas after the final property in an object or the final item in an array.
JSON strings and property names must use double quotes, not single quotes.
Every object key must be wrapped in double quotes, even if it looks like a JavaScript identifier.
Add commas between object properties and array items so the parser can separate values.
Remove // and /* */ comments before using JSON in APIs, config files, or data imports.
Use true, false, and null in lowercase. Values such as True, None, undefined, and NaN are invalid.
Yes. You can validate, format, paste, upload, and reset JSON directly in your browser without creating an account.
No. Validation runs client-side in your browser, so the JSON you paste or upload stays on your device.
Yes. After entering valid JSON, use the formatter button in the editor toolbar to beautify it with indentation.
JSON is stricter than JavaScript object syntax. JSON does not allow comments, trailing commas, single-quoted strings, or unquoted keys.