How to Validate JSON Schema
Validate JSON data against a JSON Schema definition. Check types, required fields, patterns, and constraints. Free online validator with detailed error messages.
Open JSON Schema Validator →Step-by-Step Guide
Enter your JSON Schema
Paste your JSON Schema definition in the schema editor. The tool supports Draft 4, 6, 7, and 2020-12 specifications. Start from a template or write your own schema from scratch.
Paste your JSON data
Enter the JSON data you want to validate in the data editor. This is the actual payload — an API response, config file, or user input — that should conform to the schema.
Run validation
Click validate to check your data against the schema. The tool checks types, required properties, string patterns, numeric ranges, array constraints, and conditional rules.
Fix reported errors
Each validation error shows the exact JSON path, the rule that failed, and what was expected. Fix issues one by one or use the error summary to prioritize the most critical problems.
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Open JSON Schema Validator