head to head · open source
openapi-generator vs typia
openapi-generator has 26,846 GitHub stars, 7,748 forks, 5,819 open issues and last shipped yesterday. typia has 5,961 stars, 233 forks, 4 open issues and last shipped yesterday. openapi-generator leads on adoption by 350% (26,846 vs 5,961 stars). openapi-generator is written in Java under Apache-2.0; typia is written in TypeScript under MIT. openapi-generator has attracted 29% as many forks as stars, typia 4%. openapi-generator was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (generator, hacktoberfest, openapi), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| openapi-generator | typia | |
|---|---|---|
| GitHub stars | ★ 27K | ★ 6.0K |
| License | Apache-2.0 | MIT |
| Written in | Java | TypeScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 7.7K | ⑂ 233 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick openapi-generator if
- You weight community size — 27K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Java
- You value the larger contributor base for long-term maintenance
pick typia if
- You want the typia feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and typia fits your workflow better
About openapi-generator
OpenAPI Generator Master ( 7.27.0 ): :star::star::star: If you would like to contribute, please refer to guidelines and a list of open tasks. :star::star::star: :bangbang: To migrate from Swagger Codegen to OpenAPI Generator, please refer to the migration guide :bangbang: :notebook with decorative cover: For more information, please refer to the Wiki page and FAQ :notebook with decorative cover: :notebook with decorative cover: The eBook A Beginner's Guide to Code Generation for REST APIs is a good starting point for beginners :notebook with decorative cover: :warning: If the OpenAPI spec, templates or any input…
read the full openapi-generator overview →
About typia
Typia typia is a transformer library supporting below features: Super fast Runtime Validators Enhanced JSON schema and serde functions LLM function calling harness Protocol Buffer encoder and decoder Random data generator [!NOTE] Only one line required, with pure TypeScript type Runtime validator is 20,000x faster than class validator JSON serialization is 200x faster than class transformer LLM function calling harness turns 6.75% → 100% accuracy Write the type on the left, and typia compiles it into the validator on the right — at build time, with no schema and no runtime reflection. Setup Install typia with…
read the full typia overview →
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Frequently asked questions
Is openapi-generator or typia more popular?
openapi-generator has 26,846 GitHub stars and typia has 5,961. openapi-generator has the larger community by that measure.
Are openapi-generator and typia free?
Both are open source. openapi-generator is licensed under Apache-2.0 and typia under MIT. Neither carries a licence fee.
What is the difference between openapi-generator and typia?
openapi-generator is written in Java and typia in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, openapi-generator or typia?
Choose openapi-generator if you want the larger community (26,846 stars) or its Apache-2.0 licence terms. Choose typia if its feature set, stack or MIT licence fits better. Both are self-hostable.