JSON Validator
Validate JSON syntax and structure with detailed error reporting.
Enter JSON and click Validate
Validation Features
Syntax Validation
Real-time JSON parsing with precise error location reporting including line and column numbers.
Schema Validation
Optional JSON Schema support to validate structure, types, required properties, and nested constraints.
Structure Analysis
Get insights into your JSON: root type, total keys, nesting depth, and byte size.
Fix Suggestions
Contextual suggestions for common JSON errors like trailing commas, missing quotes, and truncated input.
All validation happens locally in your browser. No data is sent to any server.
Technical Specification
JSON Schema Validation & Structural Compliance Engine
Overview
The ToolsForges JSON Validator goes beyond basic syntax checking to validate JSON data against user-provided schema definitions, ensuring structural compliance, type correctness, and required-field presence before data reaches production systems. Paste your JSON payload and schema definition to receive a detailed validation report identifying every structural violation, type mismatch, and missing required field.
Feature Specifications
- JSON Schema Compliance CheckingValidate JSON payloads against standard JSON Schema definitions, checking type correctness, required field presence, nested object structure, and array item validation.
- Detailed Error ReportingReceive precise error messages with JSON path locations identifying exactly which field failed validation and why, enabling rapid debugging of schema compliance issues.
- Nested Object ValidationRecursively validate deeply nested JSON objects and arrays, ensuring that every level of the data structure conforms to the defined schema without遗漏 violations.
- Type Mismatch DetectionIdentify and report type mismatches where the provided value does not match the expected type — string where number is expected, null where object is required.
Architecture
The validator uses React useState for JSON and schema inputs and implements a recursive validation engine that traverses the schema definition, checking each constraint against the provided data. Results render in a structured error list with JSON path indicators.
Frequently Asked Questions
What JSON Schema versions are supported?
The validator supports core JSON Schema draft features including type, required, properties, items, enum, pattern, minimum, maximum, minLength, and maxLength constraints.
Can I validate API responses?
Yes. Paste the API response JSON and define the expected schema to verify that the response conforms to your API contract before integrating it into your application logic.
Does this validate JSON against TypeScript interfaces?
The validator works with JSON Schema definitions, not TypeScript interfaces directly. Convert your TypeScript interfaces to JSON Schema format using available tools before validation.
Is my JSON data stored?
No. All JSON payloads and schema definitions are processed entirely within your browser. No data is transmitted to external servers or stored beyond the active session.