JSON Validator

How to Use the JSON Validator

Paste JSON data and get instant validation with precise error locations. The tool shows the exact line and column where errors occur and provides detailed statistics about your JSON structure.

Features

Precise Error Reporting — Shows the exact line number, column position, and error message for syntax issues.

Deep Analysis — Counts total keys, nesting depth, arrays, objects, strings, numbers, booleans, and nulls.

Pretty Print — Valid JSON is automatically formatted with proper indentation.

Privacy First — All validation happens in your browser.

Common Use Cases

API Debugging — Validate responses from REST APIs to find malformed data.

Config Validation — Check package.json, tsconfig.json, or any config file for syntax errors.

Data Import — Validate JSON before importing into databases or applications.

Learning — Understand JSON structure through the statistics breakdown.

Why Use This Tool

JSON syntax errors can be maddeningly subtle — a missing comma, an extra trailing comma, or an unescaped quote. This tool pinpoints the exact location of the error instead of giving you a generic "Unexpected token" message.