James Allman — JA Technology Solutions LLC
JSON Schema Validator
Validate JSON documents against JSON Schema definitions with detailed error reporting and skeleton generation.
JSON Schema Validator
Paste or upload a JSON Schema and a JSON document side by side, then validate. Errors are reported with the exact JSON path, a human-readable message, and the schema path that triggered the violation. Auto-detects the schema draft version from the $schema property. Generate a minimal skeleton JSON that conforms to the schema with one click. Supports draft-07 and 2020-12 with format validation. Everything runs in your browser — your data never leaves your machine.
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What Is JSON Schema?
JSON Schema is a vocabulary for annotating and validating JSON documents. It describes the expected structure, types, constraints, and relationships of a JSON payload — similar to what XSD does for XML. JSON Schema is widely used for API request/response validation, configuration file validation, form generation, and data interchange contracts between systems.
Why Validate Against a Schema?
Invalid data that passes silently through a pipeline causes downstream failures that are harder to diagnose than catching the violation at the boundary. Schema validation catches missing required fields, wrong types, out-of-range values, invalid formats, and structural mismatches before the data reaches application logic. This tool shows you exactly where and why each violation occurs.
API and Data Validation Services
This tool validates individual documents interactively. For building automated validation into API middleware, data pipelines, and integration workflows, I build the infrastructure. Learn about integration services or custom application development. Have questions? Ask James.
All tools run entirely in your browser. Your data never leaves your machine. Need help? Ask James.