JSON Schema Validator

Why use JSON Schema validation

JSON Schema lets you define rules for your JSON data — expected types, required fields, value ranges, and structural patterns. By validating at the boundary, you catch bad data before it reaches your APIs, databases, or configuration systems.

• API contract validation for request and response payloads
• Configuration file validation before deployment
• Form data validation in frontend applications
• Automated testing of JSON data structures

Specification reference: json-schema.org

Frequently asked questions

What is JSON Schema?

JSON Schema is a way to describe the expected shape of your JSON data — required fields, types, formats, and constraints. Schemas are just JSON files, so they're easy to version-control, share with a team, and plug into CI pipelines.

Which JSON Schema versions are supported?

This validator supports JSON Schema draft 2020-12, draft-07, draft-06, and draft-04. The tool automatically detects the schema version from the $schema keyword, so you can paste any schema and validation will use the correct specification rules.

Is my data sent to a server?

No. All validation runs in your browser using JavaScript. Your JSON data and schemas never leave your device — nothing is sent to a server. Safe to use with sensitive data, API keys, or internal configuration.

What are common JSON Schema validation errors?

Common errors include: type mismatches (expecting string but got number), missing required properties, values outside of minimum/maximum bounds, strings not matching regex patterns, and additional properties when additionalProperties is false. The validator shows the exact JSON path where each error occurred.

Related tools

• JSON Studio — format, beautify, and validate JSON syntax
• JSON Diff — compare two JSON documents for structural differences
• JSON to YAML — convert validated JSON to YAML for Kubernetes
• JSON to CSV — export JSON arrays to spreadsheet format