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

[BUG] [kotlin-server] Does not create type mapping for oneOf (jaxrs-spec) Open

Issue: Bug

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

OpenAPITools/openapi-generator#24606 · 9 comments · Opened Aug 4, 2026
[BUG][typescript] String enum values containing "/*" are corrupted to "/_*" Open

Issue: Bug

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

OpenAPITools/openapi-generator#24572 · 1 comment · Opened Aug 3, 2026
[BUG][Spring] Model named Tag collides with @Tag annotation import, generated code does not compile Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

OpenAPITools/openapi-generator#24554 · Opened Aug 1, 2026
[BUG] Inline request-body schema silently overwrites a spec-defined schema with a mangled-equal name Open

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

OpenAPITools/openapi-generator#24548 · Opened Aug 1, 2026
[BUG] allOf-inherited "any type" additionalProperties map degrades to free-form object Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

OpenAPITools/openapi-generator#24546 · Opened Aug 1, 2026
[REQ][Go] Allow streaming large response bodies Open

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

OpenAPITools/openapi-generator#24543 · Opened Jul 31, 2026
Dont apply useOptional globally like models Open

Enhancement: Feature

Difficulty 4/5 3-5 days Newbie friendliness 45/100

OpenAPITools/openapi-generator#24537 · 1 comment · Opened Jul 31, 2026
[BUG] openapi-yaml generator produces invalid output with nested references Open

Issue: Bug

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

OpenAPITools/openapi-generator#24528 · Opened Jul 30, 2026
[Announcement] Decommission scalatra server generator Open

Announcement

Difficulty 3/5 1-2 days Newbie friendliness 48/100

OpenAPITools/openapi-generator#24525 · Opened Jul 30, 2026
[BUG][core] OAS 3.1 property with a bare type: "null" resolves to a never-generated Null / ModelNull model (regression in 7.17.0) Open

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

OpenAPITools/openapi-generator#24520 · 7 comments · 1 reaction · Opened Jul 29, 2026
[BUG][typescript-axios] Missing import for a $ref under additionalProperties on a 3.1 nullable property Open

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

OpenAPITools/openapi-generator#24517 · 1 comment · Opened Jul 29, 2026
[BUG][KOTLIN][RESTCLIENT] Multiple consumes media types overwrite Content-Type header, last one always wins Open

Issue: Bug

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

OpenAPITools/openapi-generator#24500 · 1 comment · Opened Jul 27, 2026
[REQ] Feature Request Description Open

Enhancement: Feature

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

OpenAPITools/openapi-generator#24470 · Opened Jul 26, 2026
[BUG][CSHARP][GENERICHOST] oneOf Serialization: Empty WriteProperties Open

Issue: Bug

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

OpenAPITools/openapi-generator#24398 · 1 comment · Opened Jul 23, 2026
[BUG][CSHARP][GENERICHOST] Undefined Enum in Generated Converters using oneOf Open

Issue: Bug

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

OpenAPITools/openapi-generator#24397 · Opened Jul 23, 2026
[BUG][JAVA][gson] CustomTypeAdapterFactory throws "Not a JSON Object:null" for null additionalProperties values Open

Issue: Bug

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

OpenAPITools/openapi-generator#24393 · Opened Jul 23, 2026
[REQ] [Java] [Spring] Security info without SecurityContextHolder Open

Enhancement: Feature

Difficulty 5/5 Over a week Newbie friendliness 35/100

OpenAPITools/openapi-generator#24391 · 1 comment · Opened Jul 22, 2026
[python] multipart/form-data headers get URL-encoded via aiohttp.FormData Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

OpenAPITools/openapi-generator#24376 · Opened Jul 21, 2026
[BUG][csharp][generichost] Wrong error type used during deserialization Open

Issue: Bug

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

OpenAPITools/openapi-generator#24345 · Opened Jul 19, 2026
[BUG][python] Explicit additionalProperties: false ignored when disallowAdditionalPropertiesIfNotPresent=false Open

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

OpenAPITools/openapi-generator#24329 · Opened Jul 16, 2026
[BUG][typescript-fetch] oneOf ToJSON applies the date variant's toISOString() to every variant Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

OpenAPITools/openapi-generator#24321 · Opened Jul 16, 2026
[REQ] [JAVA] Possibility to customize equals hashCode and toString Open

Enhancement: Feature

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

OpenAPITools/openapi-generator#24319 · 15 comments · 2 reactions · Opened Jul 15, 2026
[REQ][RUST] Allow structs generated by using the `useSingleRequestParameter` option to derive from `#[derive(Default)]` Open

Enhancement: Feature

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

OpenAPITools/openapi-generator#24314 · Opened Jul 15, 2026
[REQ][RUST] Allow rust generator `useBonBuilder` option for all `library` types Open

Enhancement: Feature

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

OpenAPITools/openapi-generator#24313 · Opened Jul 15, 2026
[REQ][RUST] Update template generated version of bon for option `useBonBuilder` Open

Enhancement: Feature

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

OpenAPITools/openapi-generator#24312 · 1 comment · Opened Jul 15, 2026
[Announcement] Drop Python 3.9 support Open

Announcement

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

OpenAPITools/openapi-generator#24293 · 1 reaction · Opened Jul 14, 2026
[BUG] Issue with options Open

Issue: Bug

Difficulty 5/5 Over a week Newbie friendliness 15/100

OpenAPITools/openapi-generator#24266 · 1 reaction · Opened Jul 9, 2026
[BUG] Unrecognized path-item operations (e.g. OpenAPI 3.2 'query') are silently dropped from generated code with --skip-validate-spec Open

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

OpenAPITools/openapi-generator#24212 · Opened Jul 6, 2026
[BUG][SPRING] Incorrect @JsonTypeName generated for oneOf discriminator mapping regression in 7.23.0 Open

Issue: Bug

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

OpenAPITools/openapi-generator#24198 · 6 comments · Opened Jul 3, 2026
[BUG] [regression] [7.23.0] [InlineModelResolver] Previously generated sources are no longer generated without fallback Open

Issue: Bug

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

OpenAPITools/openapi-generator#24177 · 17 comments · Opened Jul 1, 2026
[BUG][jaxrs-spec] Discriminated model serializes a duplicate `type` with the class name instead of the discriminator value Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

OpenAPITools/openapi-generator#24175 · 2 comments · Opened Jul 1, 2026
[REQ][Java][Spring] xml issue Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

OpenAPITools/openapi-generator#24155 · 1 comment · Opened Jun 29, 2026
[Announcement] Replace php with php-nextgen Open

Announcement

Difficulty 5/5 Over a week Newbie friendliness 20/100

OpenAPITools/openapi-generator#24150 · 2 reactions · Opened Jun 29, 2026
[Discussion] Can we do better than Mustache templates? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

OpenAPITools/openapi-generator#24148 · 8 comments · 1 reaction · Opened Jun 28, 2026
[BUG][C#][generichost] All schemes from OR-alternative security requirements are applied — apiKey "in: query" leaks the secret into the URL Open

Issue: Bug

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

OpenAPITools/openapi-generator#24138 · 5 comments · Opened Jun 26, 2026
[REQ][Java][Retrofit2] Preserve response headers for binary file responses with declared headers Open

Enhancement: Feature

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

OpenAPITools/openapi-generator#24137 · 1 reaction · Opened Jun 26, 2026
ApiOriginFilter templates ship wildcard CORS (Access-Control-Allow-Origin: *) by default — CWE-942 Open

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

OpenAPITools/openapi-generator#24113 · Opened Jun 24, 2026
[BUG] Nullable properties generated as not null in Rust Open

Issue: Bug

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

OpenAPITools/openapi-generator#24108 · Opened Jun 23, 2026
[REQ] [typescript-nestjs-server] Add ArrayPipe support Open

Enhancement: Feature

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

OpenAPITools/openapi-generator#24107 · Opened Jun 23, 2026
[REQ] [JAVA] [SPRING] Add a way to pass the content type as a method parameter Open

Enhancement: Feature

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

OpenAPITools/openapi-generator#24106 · 4 comments · Opened Jun 23, 2026
[REQ] [JAVA] [SPRING] add option to pass authorization token in a method parameter instead of interceptor Open

Enhancement: Feature

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

OpenAPITools/openapi-generator#24087 · 1 comment · Opened Jun 21, 2026
## [typescript-angular] Nested query object serialization changed between 7.11.0 and 7.23.0 Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

OpenAPITools/openapi-generator#24059 · 1 comment · 2 reactions · Opened Jun 18, 2026
[BUG][Java][Native] invalid generated code when binary/file responses are mapped to InputStream Open

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

OpenAPITools/openapi-generator#24057 · Opened Jun 18, 2026
[REQ] Convert StringSchema with format "uri-reference" to java.net.URI instead if java.lang.String in Java client Codegenerator Open

Enhancement: Feature

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

OpenAPITools/openapi-generator#24012 · 4 comments · Opened Jun 12, 2026
[REQ] Optional getters for nullable fields only (opt-in, raw-type setters) Open

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

OpenAPITools/openapi-generator#24002 · 1 comment · Opened Jun 11, 2026
[BUG] [cpp-httplib-server] Throw exception if optional property not present in json payload Open

Issue: Bug

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

OpenAPITools/openapi-generator#23991 · Opened Jun 10, 2026
[BUG][JAVA][MAVEN] Array aliases generate uncompilable Java code with generateAliasAsModel=true Open

Issue: Bug

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

OpenAPITools/openapi-generator#23988 · 3 comments · Opened Jun 10, 2026
Dynamic matrix filtering for sample build workflows — any known reasons for the current broad recompilation and unit test triggering? Open

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

OpenAPITools/openapi-generator#23965 · 1 comment · Opened Jun 7, 2026
[CORE?;KOTLIN]Pre-escaping vs. Template-targeted Escaping in openapi-generator Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

OpenAPITools/openapi-generator#23962 · 1 comment · 1 reaction · Opened Jun 6, 2026
[BUG][Kotlin] Operation Description Escapes Generated Annotation String and Injects a Spring Handler Open

Issue: Bug

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

OpenAPITools/openapi-generator#23956 · 11 comments · Opened Jun 5, 2026

OpenAPITools/openapi-generator

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