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Valid JSON18 lines259 B
Client-side only
JSON Validator
Validate your JSON data instantly with detailed error messages. Our validator checks JSON syntax and highlights errors with exact line numbers and descriptions. All validation happens in your browser — no data is sent to any server.
Features
- Real-time validation as you type
- Detailed error messages with line and column numbers
- Syntax highlighting for JSON
- Support for large JSON files
- 100% client-side processing
Frequently Asked Questions
What JSON errors does the validator detect?
The validator detects all JSON syntax errors including: trailing commas, single quotes, unquoted keys, comments, undefined values, missing colons or commas, and unclosed brackets or braces.
Does the validator send my JSON to a server?
No. Validation happens entirely in your browser using JavaScript's built-in JSON.parse(). Your data never leaves your machine.