JSON Schema Validator
Validate JSON against a JSON Schema online. Checks required fields, data types, value constraints, and patterns. Free, 100% client-side — your data never leaves your browser.
JSON Input
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JSON Schema
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What is JSON Schema?
JSON Schema is a vocabulary that allows you to annotate and validate JSON documents. It defines the structure, data types, and constraints that a JSON object must conform to. JSON Schema is widely used in APIs, form validation, configuration management, and data pipelines to ensure data quality and consistency.
This validator supports the most commonly used JSON Schema keywords including type, required, properties, minimum, maximum, minLength, maxLength, pattern, and enum.