01
Open Schema Validator
Go to app.bracketview.in/json-schema in your browser.
Schema Validator
JSON Schema Validator Online
BracketView validates JSON against JSON Schema and OpenAPI definitions. See exactly which fields are missing or wrong. Free online schema validator — no install.
JSON Schema validation confirms that your JSON data matches an expected structure — required fields, correct types, and allowed values. BracketView's schema validator lets you paste a JSON Schema or OpenAPI definition alongside your data and see exactly which fields are missing, have wrong types, or violate constraints. Essential for API contract testing, webhook payload review, and keeping documentation accurate. Generate schemas from example objects, validate against them, and iterate fast — all in your browser.
Key features
- Validate JSON against JSON Schema
- Support for OpenAPI schema definitions
- Detailed error messages per field
- Schema generator from example JSON
- Schema library for common patterns
- Pair with type generator for code export
- Free core validation — no install
How to
How to Validate JSON Against a Schema with BracketView
Check JSON against a JSON Schema in three steps using BracketView.
02
Paste schema and JSON
Paste your JSON Schema and the JSON data you want to validate.
03
Review validation results
See which fields fail validation with specific error messages.
Frequently asked questions
What is JSON Schema validation?
JSON Schema validation checks whether JSON data conforms to a defined structure — required fields, types, and constraints.
Can I validate against OpenAPI schemas?
Yes. BracketView supports JSON Schema and OpenAPI schema definitions for validation.
Can BracketView generate a schema from JSON?
Yes. BracketView includes a Schema Generator that creates a JSON Schema draft from an example object.
Is schema validation free?
Yes. Core schema validation is included in the free BracketView workspace.
What happens when validation fails?
BracketView shows specific errors — which fields are missing, have wrong types, or violate schema rules.
Related tools
Explore more JSON tools in the BracketView workspace.