JSON Schema Validator
Validate JSON data against a JSON Schema.
JSON Data
JSON Schema
About JSON Schema Validator
JSON Schema Validator checks whether your JSON data conforms to a provided JSON Schema definition, reporting any fields that are missing, of the wrong type, or violate constraints. This is the standard way to enforce data contracts between services, validate user input on the backend, or test that an API response matches its documented shape. It supports JSON Schema drafts 4, 6, 7, and 2019-09.
Related Tools
Frequently Asked Questions
Is JSON Schema Validator free?
Yes, completely free. No signup, no account, no usage limits. Use it as much as you need.
Is my data secure?
All processing happens directly in your browser using JavaScript. Your data is never sent to any server, stored, or shared. It stays entirely on your device.
Where do I get a JSON Schema for my data?
Many APIs publish their schema alongside their documentation. You can also generate one from example data using tools like quicktype.io, or write one by hand following the JSON Schema specification.
Which JSON Schema draft versions are supported?
The validator supports drafts 4, 6, 7, and 2019-09, covering the vast majority of schemas in use today.