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Top 20 Rust OpenAPI Projects
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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cherrybomb
Stop half-done APIs! Cherrybomb is a CLI tool that helps you avoid undefined user behaviour by auditing your API specifications, validating them and running API security tests.
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openapi-fuzzer
Black-box fuzzer that fuzzes APIs based on OpenAPI specification. Find bugs for free!
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rustmailer
A self-hosted Email Middleware for IMAP, SMTP, Gmail API, Graph API — built for developers
Project mention: Show HN: RustMailer – self-hosted email middleware now supports Gmail API | news.ycombinator.com | 2025-10-05 -
utoipauto
Rust Macros to automate the addition of Paths/Schemas to Utoipa crate, simulating Reflection during the compilation phase
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
- Project mention: Show HN: Mixing Deterministic Codegen with LLM Codegen for Client SDKs | news.ycombinator.com | 2025-08-26
Hi HN, I’m Patrick. Elias, Kevin, and I are building Sideko (https://sideko.dev), a new type of code generator for building and maintaining API client SDKs from OpenAPI specs.
Our approach differs significantly from traditional SDK generators in that we use structured pattern matching queries to create and update the code. Other SDK generators use templates, which overwrite custom changes and produce code that looks machine generated.
We’ve mixed in LLM codegen by creating this workflow: Run deterministic codegen to establish the SDK structure. Let LLMs enhance specific components where adaptability adds value and include agent rules files that enforce consistency and correctness with type checking and integration tests against mock servers. The system will retain the LLM edits, while the rest of the SDK is automatically maintained by the deterministic generator (keeping it in sync with the API). LLMs can edit most the files (see python rules and typescript rules).
You can try it out from your terminal:
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- Project mention: Ask HN: Best way to add trackable events at Homebrew/casks? | news.ycombinator.com | 2025-06-30
I recently released Peeksy (https://github.com/anubhavitis/peeksy), and I am getting good feedback from some of the users. Therefore, I wanted to add some requested features and build this as a standard homebrew/cask.
I want to add some tracking events like, installs, uninstalls, and activation of some important flows. How can I do that?
Is there any existing setup for this? Or do I need to create a server that handles this tracking?
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myself
Myself is a Rust library for building conversational agents powered by LLM technology , providing a simple Agent abstraction to manage interactions and memory. It's like a engine to create LLM Powered Apps.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).
Rust OpenAPI discussion
Rust OpenAPI related posts
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Show HN: Mixing Deterministic Codegen with LLM Codegen for Client SDKs
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Type safe web stack with Rust and TypeScript
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Looking for a Rust API with automatic documentation and good validation?
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Announcing utoipa 3.0.0, one year anniversary release - Compile time OpenAPI library for Rust
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New Tokio blog post: Announcing axum 0.6.0
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Tool to generate API client libraries (for Rust & other langs)
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Book Review: Zero To Production In Rust
- A note from our sponsor - Stream getstream.io | 23 Dec 2025
Index
What are some of the best open-source OpenAPI projects in Rust? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | utoipa | 3,525 |
| 2 | cherrybomb | 1,220 |
| 3 | paperclip | 952 |
| 4 | openapi-fuzzer | 565 |
| 5 | rustmailer | 334 |
| 6 | utoipauto | 180 |
| 7 | WuppieFuzz | 157 |
| 8 | sideko | 88 |
| 9 | oas3-rs | 68 |
| 10 | oal | 37 |
| 11 | openapi | 26 |
| 12 | oxide_todo | 23 |
| 13 | plaid-rs | 17 |
| 14 | minos | 15 |
| 15 | peeksy | 14 |
| 16 | openapi-yup-generator | 9 |
| 17 | myself | 7 |
| 18 | postman-rs | 1 |
| 19 | sendgrid-rs | 0 |
| 20 | benchling-rs | 0 |
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Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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