OpenAPITools/openapi-generator

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OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Stars: 26.8k
Forks: 7.7k
Open beginner issues: 49
Indexed issues: 5.1k
Avg merge: 1d 6h
Merged PRs (30d): 100

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 20, 2026
Latest indexed: Sep 21, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted hacktoberfest good first issue

Beginner friendly Everything

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5,127 open issues indexed

[REQ] Feature Request Description Open

Enhancement: Feature

Difficulty 4/5 3-5 days Newbie friendliness 52/100

OpenAPITools/openapi-generator#24965 · Opened Sep 19, 2026
[REQ] AsciiDoc generator should allow using AsciiDoc in field description Open

Enhancement: Feature

Difficulty 3/5 1-2 days Newbie friendliness 65/100

OpenAPITools/openapi-generator#24962 · Opened Sep 18, 2026
[BUG][Java] useOneOfInterfaces generates incompatible discriminator return types for inline enums Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

OpenAPITools/openapi-generator#24959 · 2 comments · Opened Sep 17, 2026
[REQ] [Kotlin] Default optional parameters to null Open

Enhancement: Feature

Difficulty 3/5 1-2 days Newbie friendliness 70/100

OpenAPITools/openapi-generator#24958 · 1 comment · Opened Sep 17, 2026
[REQ][typescript-fetch] Name downloaded files from Content-Disposition (return a File instead of an anonymous Blob) Open

Enhancement: Feature

Difficulty 3/5 1-2 days Newbie friendliness 35/100

OpenAPITools/openapi-generator#24956 · Opened Sep 16, 2026
[BUG] [JAVA] Broken code generation when using `format: enum` Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

OpenAPITools/openapi-generator#24950 · 6 comments · Opened Sep 15, 2026
[BUG][core] splitOperationsByContentType: a variant sends the Accept of another media-type when the operation has JSON error responses Open

Issue: Bug

Difficulty 4/5 3-5 days Newbie friendliness 68/100

OpenAPITools/openapi-generator#24948 · Opened Sep 15, 2026
[BUG] [JAVA] `HttpClient memberVarHttpClient` not `close`d Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

OpenAPITools/openapi-generator#24942 · Opened Sep 14, 2026
[REQ] [kotlin-spring] Add clientRegistrationId for spring-declarative-http-interface (parity with Java spring) Open

Enhancement: Feature

Difficulty 3/5 1-2 days Newbie friendliness 74/100

OpenAPITools/openapi-generator#24936 · 1 comment · Opened Sep 12, 2026
[BUG][Go] No json tags emitted when a schema has both properties and a schema-level oneOf, silently dropping snake_case fields on decode Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

OpenAPITools/openapi-generator#24916 · Opened Sep 9, 2026
[REQ][swift6] Option to mark generated declarations nonisolated for projects using default MainActor isolation Open

Enhancement: Feature

Difficulty 4/5 3-5 days Newbie friendliness 55/100

OpenAPITools/openapi-generator#24903 · Opened Sep 8, 2026
[BUG] typescript-fetch unique item array with primitives in response body is not wrapped into Set Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 62/100

OpenAPITools/openapi-generator#24888 · Opened Sep 7, 2026
[BUG] typescript-fetch api doesn't compile with unique items array in the response body Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

OpenAPITools/openapi-generator#24887 · Opened Sep 6, 2026
[BUG] [PYTHON] Schema name normalization collision generates invalid model imports Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

OpenAPITools/openapi-generator#24880 · 1 comment · Opened Sep 5, 2026
[BUG][JAVA] Direct property enum reference used by parameter omits generated model import Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 74/100

OpenAPITools/openapi-generator#24875 · 1 comment · Opened Sep 4, 2026
[BUG][java] Discriminator default for direct property enum $ref generates String.<value> Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

OpenAPITools/openapi-generator#24874 · 1 comment · Opened Sep 4, 2026
[BUG][KOTLIN] Jackson3 option does not discover modules like Jackson2 does Open

Issue: Bug

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

OpenAPITools/openapi-generator#24859 · Opened Sep 3, 2026
[BUG] [cpp-httplib-server] Primitive and binary response types incorrectly generated as models Open

Issue: Bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

OpenAPITools/openapi-generator#24854 · Opened Sep 3, 2026
Java generator: parameter defaultValue not escaped in @param Javadoc, breaks compilation for values containing "*/" Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

OpenAPITools/openapi-generator#24852 · 1 comment · Opened Sep 3, 2026
[BUG][KOTLIN] Fails to compile after updating to 7.25.0 with useJackson3=false useSpringBoot4=true Open

Issue: Bug

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

OpenAPITools/openapi-generator#24842 · 1 comment · Opened Sep 2, 2026
[BUG] Swagger 2.0 unresolved schema references are not detected during client generation Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 65/100

OpenAPITools/openapi-generator#24832 · Opened Sep 1, 2026
[REQ][typescript-axios] Add TypeScript 6 to generated package.json peer range Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

OpenAPITools/openapi-generator#24830 · Opened Sep 1, 2026
[BUG] Generated code references non-existent classes on "duplicate" property definitions Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 72/100

OpenAPITools/openapi-generator#24817 · Opened Aug 31, 2026
[BUG][R] Generated samples/client/echo_api/r cannot be run Open

Issue: Bug

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

OpenAPITools/openapi-generator#24816 · 1 comment · Opened Aug 31, 2026
[BUG][R] Date and DateTime not parsed correctly Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

OpenAPITools/openapi-generator#24811 · Opened Aug 30, 2026
[REQ][KOTLIN-SPRING] Add an opt-in generic `ResponseEntity` return type Open

Enhancement: Feature

Difficulty 4/5 3-5 days Newbie friendliness 55/100

OpenAPITools/openapi-generator#24804 · 3 comments · Opened Aug 29, 2026
[Community] JavaParser sustainability — openapi-generator depends on an unfunded project Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

OpenAPITools/openapi-generator#24784 · Opened Aug 26, 2026
[BUG][JAVA] Deprecated @Valid on DTO getter for an attribute that is a container (List, ...) Open

Issue: Bug

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

OpenAPITools/openapi-generator#24782 · Opened Aug 26, 2026
[BUG] [Java] Fluent builder through allOf is lost if the child is read before the parent Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

OpenAPITools/openapi-generator#24778 · Opened Aug 25, 2026
[BUG][Java][Spring] Missing examples parameter in @Schema annotation for OAS 3.1 spec Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 74/100

OpenAPITools/openapi-generator#24755 · Opened Aug 21, 2026
[Bug] [Spring] Invalid @Valid for List body parameter Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 70/100

OpenAPITools/openapi-generator#24752 · 1 comment · 1 reaction · Opened Aug 21, 2026
[Announcement] Drop Java 8 support Open

Announcement

Difficulty 5/5 Over a week Newbie friendliness 30/100

OpenAPITools/openapi-generator#24750 · Opened Aug 21, 2026
[BUG][Java][Spring] Always generate the default constructor if it is the only constructor Open

Issue: Bug

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

OpenAPITools/openapi-generator#24747 · 2 comments · Opened Aug 20, 2026
[REQ][Java] Update the build to verify generated Java code passes common linters Open

Enhancement: Feature

Difficulty 4/5 3-5 days Newbie friendliness 48/100

OpenAPITools/openapi-generator#24746 · 2 comments · 2 reactions · Opened Aug 20, 2026
[BUG][Java][Spring] Generated code fails Error Prone UnnecessaryFinal bug pattern Open

Issue: Bug

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

OpenAPITools/openapi-generator#24744 · Opened Aug 20, 2026
[BUG] Unable to compile code generated for GitHub OpenAPI Spec. Open

Issue: Bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

OpenAPITools/openapi-generator#24743 · Opened Aug 19, 2026
[BUG][Spring] Wrong nullability of method parameters with spring-http-interface library Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 64/100

OpenAPITools/openapi-generator#24737 · 2 comments · Opened Aug 19, 2026
[BUG] [php] [php-nexgen] allOf with annotation-only schema and string generates missing MixedString type Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

OpenAPITools/openapi-generator#24733 · 3 comments · Opened Aug 19, 2026
[BUG] [php] [php-nextgen] Number as first character of Model Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

OpenAPITools/openapi-generator#24732 · 3 comments · Opened Aug 19, 2026
Python: emit legacy-compatible model helpers once per package Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

OpenAPITools/openapi-generator#24729 · Opened Aug 18, 2026
[BUG] Multiple request-body content types generate a dangling request-model import Open

Issue: Bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

OpenAPITools/openapi-generator#24727 · 1 reaction · Opened Aug 18, 2026
[BUG][Spring] @ValidPageable / @PageableDefault / @SortDefault are never applied when the operationId needs sanitizing Open

Issue: Bug

Difficulty 3/5 1-2 days Newbie friendliness 75/100

OpenAPITools/openapi-generator#24721 · 3 comments · 1 reaction · Opened Aug 17, 2026
[BUG][spring] schema with both `$ref` and `type: object` sometimes results in `$ref` being ignored Open

Issue: Bug

Difficulty 4/5 3-5 days Newbie friendliness 64/100

OpenAPITools/openapi-generator#24710 · 6 comments · Opened Aug 14, 2026
[BUG][JAVA][SPRING] Fluent model setters for deprecated properties are not annotated with @Deprecated Open

Issue: Bug

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

OpenAPITools/openapi-generator#24704 · Opened Aug 14, 2026
Potential Vulnerabilities Due To Hidden Dependencies Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

OpenAPITools/openapi-generator#24676 · 1 comment · Opened Aug 11, 2026
[BUG][JAVA] useSpecify=true does not generate package-info.java for <invokerPackage>.auth Open

Issue: Bug

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

OpenAPITools/openapi-generator#24664 · 1 comment · Opened Aug 10, 2026
[BUG][typescript-fetch] Missing XxxFromJSON import when discriminator child is also a property type Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

OpenAPITools/openapi-generator#24654 · Opened Aug 10, 2026
[BUG][typescript-fetch] `format: date` handling is inconsistent and shifts by a day west of UTC Open

Issue: Bug

Difficulty 5/5 Over a week Newbie friendliness 38/100

OpenAPITools/openapi-generator#24636 · Opened Aug 7, 2026
[BUG][typescript-fetch] `format: date` handling is inconsistent and shifts by a day west of UTC Open

Issue: Bug

Difficulty 5/5 Over a week Newbie friendliness 42/100

OpenAPITools/openapi-generator#24635 · Opened Aug 7, 2026
[REQ][typescript-fetch] Improve typing for generated ValidationAttributeMap objects Open

Enhancement: Feature

Difficulty 3/5 1-2 days Newbie friendliness 55/100

OpenAPITools/openapi-generator#24620 · Opened Aug 5, 2026

OpenAPITools/openapi-generator

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