JSON Schema Validator - Validate JSON Against Schema Online

Validate JSON data against a JSON Schema. Check required fields, types, patterns, min/max length and more. Free, browser-based JSON schema validator.

JSON Input

JSON Schema

Validation Result

What is JSON Schema Validation?

JSON Schema is a vocabulary that allows you to annotate and validate JSON documents. It defines the structure, types, and constraints that valid JSON data must conform to.

This tool validates your JSON against a JSON Schema definition, checking required fields, data types, string patterns, numeric ranges, and more.

How to Use

1

Enter your JSON

Paste the JSON data you want to validate in the left panel.

2

Enter your JSON Schema

Paste the JSON Schema definition in the right panel. The schema defines what the valid JSON structure should look like.

3

See validation results

The tool automatically validates as you type (debounced). The output panel shows whether the JSON is valid or lists all validation errors with field paths.

Frequently Asked Questions

What JSON Schema keywords are supported?

This validator supports: type, required, properties, minLength, maxLength, minimum, maximum, pattern, and enum.

Does this tool send my data to a server?

No. All validation runs entirely in your browser. No data is ever sent to any server.

What JSON Schema draft does this validator use?

This validator implements core keywords common across JSON Schema Draft 4, 6, 7, and 2019-09. Full meta-schema validation is not supported.

Related Tools

JSON Formatter JSON Validator JSON Schema Generator JSON Minifier

References: JSON Schema | JSON.org