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JSON Schema Validator

Validate JSON data against a JSON Schema in real-time. Human-readable errors, Draft 7 and 2020-12.

Last updated: June 2026

Real-time

Validates as you type

Draft 7 & 2020

Both schema versions

Readable errors

Plain English messages

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About JSON Schema Validator

Our free JSON Schema Validator checks JSON data against a schema in real-time with human-readable error messages.

Supports Draft 7 and Draft 2020-12, example schemas, format validation, and copyable error paths.

Runs entirely in your browser using Ajv β€” your JSON never leaves your device.

Read the full guide: JSON Schema validator guide

When Should You Use the JSON Schema Validator?

API development

Validate request/response bodies against OpenAPI schemas.

Config files

Ensure required fields are present.

Debugging

Find which field fails type or format checks.

Schema design

Test schemas before deploying to production.

Learning

Understand JSON Schema keywords with examples.

Frequently Asked Questions