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JSON Schema Validator
JSON Schema Validator (Ajv Engine)Ready
Provide a JSON Schema and target JSON payload below, then click Validate Schema (⌘↵).
JSON Schema (Draft-07)
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Target JSON Data
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JSON Schema Validator

Validate JSON data against JSON Schema specifications online using Draft-07 and Draft 2020-12 standards. Real-time Ajv schema validation in your browser.

Ajv engine
Draft-07 / Draft-04
Detailed error paths
Instant client evaluation
Step-by-Step Guide

How to Use JSON Schema Validator Online

Follow these quick steps to process your data online directly in your browser with zero latency and 100% privacy.

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Step 1Compiles JSON Schema using industry-standard Ajv validation engine.
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Step 2Validates data types, constraints (e.g. minLength, maximum, pattern), and required keys.
3
Step 3Displays detailed error messages indicating the exact JSON path that failed validation.
Demonstration

Example Input & Output

Validates the data payload on the right against the JSON Schema definition on the left using the Ajv validator engine.

JSON Schema (Left)
{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "properties": {
    "userId": { "type": "integer" },
    "username": { "type": "string", "minLength": 3 }
  },
  "required": ["userId", "username"]
}
JSON Data (Right)
✓ Valid! Data matches the JSON Schema specifications.
Applications

Common Use Cases

API Testing

Verify that API server responses match contractual JSON Schema definitions.

Data Pipeline Ingestion

Ensure incoming batches adhere to required schema constraints before database insertion.

Guidelines

Specifications & Gotchas

Schema Syntax Errors

The schema itself must be valid JSON and adhere to standard JSON Schema specifications.

Knowledge

Frequently Asked Questions

What JSON Schema specifications are supported?

It supports Draft-07, Draft-06, and Draft-04 schema specifications via Ajv.

What errors are reported?

It reports missing required properties, type mismatches, pattern failures, and range violations with JSON path pointers.

Workflow

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