Online JSON Schema Validator
Validate a JSON document against a JSON Schema with readable path-specific errors. Both inputs stay entirely in your browser. It helps API developers, QA engineers, and frontend teams confirm that a JSON response follows a documented data contract.
What is a JSON Schema validator?
JSON Schema describes the shape and constraints of JSON data. A validator compares a document with that contract so API payloads, configuration files, and test fixtures can be checked before they move through an application.
How to use this validator
Paste a schema in the left editor and the JSON document it should describe in the right editor. Select Validate JSON to see either a success message or exact paths for missing properties, wrong types, and failed constraints.
Client-side validation
This tool implements common JSON Schema checks locally, including required properties, nested object properties, arrays, primitive types, enum values, lengths, ranges, and patterns. Nothing is uploaded.
How to use JSON Schema Validator for related tasks
Paste the schema and document, validate JSON online, and follow the reported JSON paths for missing fields, type mismatches, and constraints.
Related tools: JSON Parser, JSONPath Tester.
Frequently asked questions
Does this validator upload my JSON?
No. The schema and document are parsed and checked in your browser. Nothing is sent to a server or stored.
Which JSON Schema keywords are supported?
This lightweight validator supports object properties and required fields, primitive types, arrays and items, enum, minimum, maximum, minLength, maxLength, and pattern.
How are validation errors reported?
Each failure includes a JSON path such as $.user.email or $.items[0], followed by a concise reason.
How do I validate a JSON response against a schema?
Provide the schema and response together; the validator checks the contract locally and reports the exact property path that needs attention.