JSON Validator

What is JSON Validator?

A JSON validator checks whether a text string conforms to the JSON specification (RFC 8259). Invalid JSON — missing quotes, trailing commas, unescaped characters — causes parsers to fail and APIs to return errors.

Our validator pinpoints the exact line and column of syntax errors so you can fix problems quickly. This is essential when debugging API responses, editing config files, or preparing data for import.

The tool processes everything locally in your browser. Paste suspicious JSON from logs, error messages, or third-party services and get an instant pass/fail result with actionable error details.

How to Use JSON Validator

1. Paste or upload your JSON file.
2. Click Validate to check syntax.
3. Fix errors using the line and column hints.
4. Re-validate until your JSON passes.

Features

• Instant syntax validation against the JSON standard
• Precise line and column error reporting
• Upload .json files via drag-and-drop
• Clear success and error status messages
• No server upload — fully private validation
• Works with JSON from any source or programming language

Example

{"name": "test",}

Error at line 1, column 18: trailing comma

Frequently Asked Questions