OpenAPI Generator

OpenAPI Generator is ranked #5 of 33 in code generators on Freedom251. It runs on Linux, macOS, Self-hosted, Web, Windows. There is a free plan.

OpenAPI Generator plans and pricing

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OpenAPI Generator Free Open source generator for API clients, server stubs, documentation, and configurations openapi-generator.tech · 29 Sept 2026

Compared on code generators

Free plan: Yes
Project scaffolding: Yes
Custom templates: Yes
Schema-to-code generation: Yes
CLI available: Yes
IDE plugins: Yes
Supported languages: ActionScript, Ada, Apex, Bash, C, C#, C++, Clojure, Crystal, Dart, Elixir, Elm, Eiffel, Erlang, F#, Go, Groovy, Haskell, Java, JavaScript, Julia, Kotlin, Lua, Nim, Objective-C, OCaml, Perl, PHP, PowerShell, Python, R, Ruby, Rust, Scala, Swift, TypeScript, Xojo

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OpenAPI Generator

Purpose: Generates clients, servers, and documentation from OpenAPI 2.0 and 3.x documents.
Client generators: The homepage states it has 50+ client generators.
Server generators: It can generate server stubs for 40+ languages and technologies, including Java, Kotlin, Go, and PHP.
Other outputs: It includes generators for Apache2 configuration, MySQL, GraphQL schemas, and documentation formats such as HTML and Cwiki.
OpenAPI conversion: It supports generating newer JSON or YAML OpenAPI 3.x documents from OpenAPI 2.0.
Customization: Users can replace templates with Mustache templates, provide additional files and extensions through configuration, or create custom generators.
Integrations: The project documents Gradle, Maven, sbt, Bazel, GitHub, and CI/CD integrations; Cake is a third-party add-in.
Installation: The CLI can be installed through npm, Homebrew, Scoop, PyPI, Docker, JAR, JBang, or a Bash launcher script.
Supported operating systems: The installation page lists Linux, macOS, and Windows support for npm, PyPI, Docker, JAR, and JBang; Homebrew is listed for macOS and Scoop for Windows.
Runtime requirement: The JAR installation requires at least Java 11.
Community support: The project describes an active Slack community of users, contributors, and core team members for guidance and questions.
Sponsorship: The project invites individual and company sponsorship through Open Collective.
Price from: Free

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Where it ranks on Freedom251

Best Code Generators in 2026#5 of 33

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Sources

openapi-generator.tech· checked 29 Sept 2026
openapi-generator.tech/docs/customization/· checked 29 Sept 2026
openapi-generator.tech/docs/integrations/· checked 29 Sept 2026
openapi-generator.tech/docs/installation/· checked 29 Sept 2026