JSON Schema Validator
Paste JSON data and a JSON Schema (Draft-7) — instantly validate and see all errors with paths, schema hints and an auto-generated example.
Validation results will appear here after you click Validate.
{
"name": "example",
"age": 0,
"email": "example"
}What is JSON Schema Validator?
A JSON Schema validator checks whether a JSON document conforms to a schema written in the JSON Schema specification. JSON Schema is a vocabulary that allows you to describe the structure, data types, required fields, value constraints, and format of JSON data — and then automatically verify that any given JSON document follows those rules.
JSON Schema validation is a standard practice in API development, configuration management, data pipelines, and automated testing. When a service receives JSON from an external source, validating it against a schema before processing catches malformed payloads early, prevents runtime errors, and makes bugs much easier to diagnose. This tool supports JSON Schema Draft-7, which is the most widely adopted version and the one used by popular libraries like Ajv.
This validator provides more than a simple pass/fail result. When validation fails, it shows the exact JSON path where each error occurred, the rule that was violated, and a human-readable description — making it easy to fix problems quickly. You can also explore the schema structure in a tree view and generate example JSON that satisfies the schema, which is useful for writing tests or seeding development fixtures.
How to Use JSON Schema Validator
- Paste your JSON data
Enter the JSON document you want to validate in the left panel. The editor highlights syntax errors as you type.
- Paste or write your JSON Schema
Enter a JSON Schema Draft-7 document in the right panel, defining the expected structure and constraints.
- Run validation
Click Validate to check the JSON against the schema. Results appear instantly with pass confirmation or a list of errors.
- Review error paths and fix issues
Each error shows the exact JSON path (e.g. "/users/0/email") and the rule violated, so you can fix problems precisely.
Key Benefits
Errors include the exact JSON Pointer path to the failing field, not just a generic "validation failed" message.
Fully compatible with Draft-7, the most widely used version, supported by Ajv, jsonschema, and most major validators.
Generate a valid example JSON document from any schema — ideal for writing tests or populating dev environments.
Validation logic executes client-side — sensitive schema definitions and data payloads never leave your machine.
Frequently Asked Questions
This tool supports JSON Schema Draft-7. Draft-7 is the most widely deployed version in production systems. Support for Draft 2019-09 and Draft 2020-12 is planned.
A JSON Pointer (RFC 6901) is a string that identifies a specific value in a JSON document. "/users/0/email" means the "email" property of the first element in the "users" array.
Not directly — the validator requires JSON input. However, you can convert YAML to JSON using our YAML-to-JSON tool first, then validate the converted document.
In JSON Schema, properties listed in "required" must be present in the object. Properties not listed in "required" are optional — they may appear or not, but if they do appear they must match the defined schema for that property.