>_ JSON Validator

Validate your JSON data instantly. Get detailed error messages with line numbers. 100% client-side processing.

How to Use JSON Validator

  1. Paste your JSON data into the input area
  2. Click "Validate JSON" to check syntax
  3. Green result means valid JSON, red means error with details

Example

Valid: {"name": "test", "value": 42} → ✓ Valid JSON

Invalid: {name: test} → ✗ Error: keys must be quoted

FAQ

What does JSON Validator check?>
It checks if your JSON conforms to the JSON specification (RFC 8259) — proper quoting, brackets, commas, and data types.
Is my data safe?>
Yes. All validation runs in your browser. No data is sent to any server.