Data Tools

JSON Schema Validator

Validate JSON data against a schema. Check types, required fields, and constraints.

JSON Schema

JSON Data

✅Valid! Data matches schema.

Quick Schema Reference

stringText values

numberNumeric values

booleantrue/false

arrayList of items

objectNested objects

nullNull value

The Schema Validator checks a JSON document against a JSON Schema and shows you exactly what fails and why.

Point it at your schema and paste your data to verify types, required fields, string patterns, numeric ranges, and nested structures before an API contract breaks in production.

Validation runs in your browser, which makes it a safe option when payloads contain personal or proprietary data you cannot send to an online validator.

Frequently Asked Questions

What can it validate?

Type checking (string, number, boolean, array, object), required and optional fields, string patterns, numeric constraints, and nested structures.

Can I validate deeply nested data?

Yes. The validator walks the whole document, so nested objects and arrays are checked at every level.

Does my data get uploaded?

No. Both the schema and the document stay on your device.