Issue 230: Add OpenAPI 3.1 Support #1102
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The implementation provides complete OpenAPI 3.1 specification compliance while maintaining 100% backward compatibility with OpenAPI 3.0. ## What Was Implemented ### 1. Schema Object Extensions (openapi3/schema.go) Added full JSON Schema 2020-12 support with new fields: - **`Const`** - Constant value validation - **`Examples`** - Array of examples (replaces singular `example`) - **`PrefixItems`** - Tuple validation for arrays - **`Contains`, `MinContains`, `MaxContains`** - Array containment validation - **`PatternProperties`** - Pattern-based property matching - **`DependentSchemas`** - Conditional schema dependencies - **`PropertyNames`** - Property name validation - **`UnevaluatedItems`, `UnevaluatedProperties`** - Unevaluated keyword support - **Type arrays** - Support for `["string", "null"]` notation ### 2. Document-Level Features (openapi3/openapi3.go) - **`Webhooks`** - New field for defining webhook callbacks (OpenAPI 3.1) - **`JSONSchemaDialect`** - Specifies default JSON Schema dialect - **Version detection methods**: - `IsOpenAPI3_0()` - Returns true for 3.0.x documents - `IsOpenAPI3_1()` - Returns true for 3.1.x documents - `Version()` - Returns major.minor version string ### 3. License Object (openapi3/license.go) - **`Identifier`** - SPDX license expression (alternative to URL) ### 4. Info Object (openapi3/info.go) - **`Summary`** - Short summary of the API (OpenAPI 3.1) ### 5. Types Helper Methods (openapi3/schema.go) New methods for working with type arrays: - `IncludesNull()` - Checks if null type is included - `IsMultiple()` - Detects type arrays (OpenAPI 3.1 feature) - `IsSingle()` - Checks for single type - `IsEmpty()` - Checks for unspecified types ### 6. JSON Schema 2020-12 Validator (openapi3/schema_jsonschema_validator.go) A new opt-in validator using [santhosh-tekuri/jsonschema/v6](https://github.com/santhosh-tekuri/jsonschema): - Full JSON Schema Draft 2020-12 compliance - Automatic OpenAPI → JSON Schema transformation - Converts OpenAPI 3.0 `nullable` to type arrays - Handles `exclusiveMinimum`/`exclusiveMaximum` conversion - Comprehensive error formatting - Fallback to built-in validator on compilation errors
chanceattoast
commented
Oct 2, 2025
added 2 commits
October 2, 2025 09:40
…d formatting and correcting the version logic
alexglover-toast
approved these changes
Oct 2, 2025
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The implementation provides complete OpenAPI 3.1 specification compliance while maintaining 100% backward compatibility with OpenAPI 3.0.
What Was Implemented
1. Schema Object Extensions (openapi3/schema.go)
Added full JSON Schema 2020-12 support with new fields:
Const- Constant value validationExamples- Array of examples (replaces singularexample)PrefixItems- Tuple validation for arraysContains,MinContains,MaxContains- Array containment validationPatternProperties- Pattern-based property matchingDependentSchemas- Conditional schema dependenciesPropertyNames- Property name validationUnevaluatedItems,UnevaluatedProperties- Unevaluated keyword support["string", "null"]notation2. Document-Level Features (openapi3/openapi3.go)
Webhooks- New field for defining webhook callbacks (OpenAPI 3.1)JSONSchemaDialect- Specifies default JSON Schema dialectIsOpenAPI3_0()- Returns true for 3.0.x documentsIsOpenAPI3_1()- Returns true for 3.1.x documentsVersion()- Returns major.minor version string3. License Object (openapi3/license.go)
Identifier- SPDX license expression (alternative to URL)4. Info Object (openapi3/info.go)
Summary- Short summary of the API (OpenAPI 3.1)5. Types Helper Methods (openapi3/schema.go)
New methods for working with type arrays:
IncludesNull()- Checks if null type is includedIsMultiple()- Detects type arrays (OpenAPI 3.1 feature)IsSingle()- Checks for single typeIsEmpty()- Checks for unspecified types6. JSON Schema 2020-12 Validator (openapi3/schema_jsonschema_validator.go)
A new opt-in validator using santhosh-tekuri/jsonschema/v6:
nullableto type arraysexclusiveMinimum/exclusiveMaximumconversion