JSON Validator — Check JSON Syntax Online
Paste your JSON to instantly validate syntax, find errors with precise line and column numbers, and see structure statistics like key counts, depth, and size.
How It Works
Paste or type JSON and the tool instantly validates it using the browser's JSON parser. If there's an error, it extracts the position. Valid JSON shows stats including unique keys, arrays, objects, nesting depth, and byte size.
Common Use Cases
- Validate API responses
- Debug malformed configuration files
- Check JSON data before database import
- Verify JSON payloads in development
Frequently Asked Questions
It detects all syntax errors like missing commas, unquoted keys, trailing commas, mismatched brackets, and invalid values.
This tool validates and reports errors. Use our JSON Formatter tool to auto-format and fix common issues.