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JSON Schema Validator
Validate JSON against a JSON Schema in the browser with clear errors and example templates.
JSON Schema
JSON document
Example templates
Loads a Draft-07 schema and matching sample JSON into both editors.
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Frequently asked questions
Common questions about this tool.
JSON Schema is a vocabulary for annotating JSON documents with rules: allowed types, required fields, string formats, numeric ranges, nested objects, arrays, and logical combinations (for example oneOf). It is commonly used for API contracts and configuration validation.
Validation uses the Draft-07 meta-schema. The built-in examples declare $schema as http://json-schema.org/draft-07/schema#. Newer drafts may work for simple schemas but are not guaranteed; for Draft 2019-09 or 2020-12 you may need a dedicated validator or library configuration.
No. Parsing, schema compilation, and validation run entirely in your browser.
The schema itself must be valid JSON and compile cleanly. Malformed schema JSON or invalid schema logic surfaces as compilation errors before any data validation runs.
Each error lists an instance path (JSON Pointer style, where /field is a property and /items/0 is the first array element), a short message, the failing keyword (such as type or required), and the schema path that produced the rule. Fix the document at the indicated path or relax the schema if the rule is too strict.
This tool does not fetch remote $ref URLs. Inline definitions and local $ref fragments inside the same schema object work; for remote references, expand or bundle the schema first, then paste it here.
They load ready-made Draft-07 schemas plus matching sample JSON so you can see a passing validation, then edit the JSON to trigger real errors and learn how messages look.