JSON Validator
Local ProcessingCheck syntax using the browser JSON parser.
How It Works & Processing Standards
Check syntax using the browser JSON parser.
Tool processing runs in your browser. If you create a calculator or conversion share link, its values are included in the URL. See the privacy policy for account, analytics and advertising data.
Current Limits
- Desktop max file size: 50MB
- Mobile max file size: 20MB
The pasted JSON is read with a standard parser. Trailing commas, single quotes, comments and other things JSON forbids are reported with their position.
What You Can Do
- Syntax check
- Whether it parses under standard JSON rules.
- Error position
- The line and column of the problem.
How to Use JSON Validator
- 1Paste JSONPaste the JSON to check.
- 2Read the resultSee validity and any error position.
Examples
Valid JSON
Input: {"a": 1, "b": 2}
Result: ✓ Valid, top level object
Trailing comma
Input: {"a": 1,}
Result: ✗ Invalid (around line 1, column 9)
Common Use Cases
- Finding why a config file will not load
- Checking an API request body before sending
Frequently Asked Questions (FAQ)
What about JSON with // comments?
Standard JSON does not allow comments, so it is reported as invalid. For JSONC or JSON5, remove comments first.