JSON Validator & Schema Checker
Industrial-grade JSON syntax and schema validator with line-number error pointing, auto-repair, and schema inference.
How to Use
Debugging and validating JSON is fast and precise with our diagnostic editor:
- Paste JSON: Enter your data into the JSON DATA input box.
- Identify Errors: If violations are found, look at the Diagnostic HUD in the sidebar for exact line numbers and error descriptions.
- Auto-Fix: Use the Auto-Fix Syntax button if available to instantly repair common syntax errors.
- Validate Schema: Toggle Schema Validation and paste your JSON Schema to verify complex data rules and types.
- Infer Schema: Don't have a schema? Click Infer Schema from Data to generate one automatically based on your current input.
About This Tool
Deep Structural Inspection
Most validators only tell you that a parse failed. Our JSON Validator goes deeper, using structural source-mapping to link schema violations back to the specific characters in your text. This makes it an essential tool for developers building high-reliability APIs or complex cloud configurations.
Why Use This Tool
Why use our tool?
Privacy-first diagnostics. While many online linting tools log your data or schema for analysis, DevToolkit performs all validation 100% client-side. Your sensitive API payloads, proprietary schemas, and internal documentation never leave your browser, ensuring complete security and compliance.