--- title: Lucyd - Auto-doc & testing for Axum routes (HTTP,... description: Lucyd is a new Rust crate that centralizes documentation and testing for Axum-based backends supporting HTTP, WebSocket, and MQTT protocols in a single... canonical: https://daily.dev/posts/lucyd---auto-doc-testing-for-axum-routes-http-websocket-mqtt--rfxu1yjyy twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Lucyd - Auto-doc & testing for Axum routes (HTTP, WebSocket, MQTT) | daily.dev og:description: Lucyd is a new Rust crate that centralizes documentation and testing for Axum-based backends supporting HTTP, WebSocket, and MQTT protocols in a single... og:url: https://daily.dev/posts/lucyd---auto-doc-testing-for-axum-routes-http-websocket-mqtt--rfxu1yjyy og:image: https://api.daily.dev/og/posts/rFxU1YJyy.png og:image:alt: Lucyd - Auto-doc & testing for Axum routes (HTTP, WebSocket, MQTT) og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Lucyd - Auto-doc & testing for Axum routes (HTTP, WebSocket, MQTT) **[Arnaud Fischer](https://daily.dev/sources/kosvs7jhwte129hyptnma)** · [@jeck0v](https://daily.dev/jeck0v) · 1 min read · 8 upvotes · 0 comments ## Summary Lucyd is a new Rust crate that centralizes documentation and testing for Axum-based backends supporting HTTP, WebSocket, and MQTT protocols in a single structured project. Inspired by OpenAPI and FastAPI's native documentation approach, it aims to replace juggling multiple tools like Postman and MQTT Explorer. The author is seeking honest feedback on API design, code architecture, and overall project value. ## Content I was fed up with switching between Postman, MQTT Explorer and other tools just to test my backend, so I built my own thing. Lucyd is a Rust crate inspired by OpenAPI that centralises the description and testing of HTTP, WebSocket and MQTT requests within a single, structured project. Background: I’m developing the backend for a 3D Flipper project, and these three protocols run in parallel. Having everything in one place really makes a difference to my day-to-day work (especially as I'm used to working with FastAPI, which uses OpenAPI natively). But I might not be entirely objective. What I’m looking for: honest feedback on the API design, the code architecture, and the project’s actual value. No false politenes, I prefer tough, constructive feedback. If this resonates with you, if you want to contribute, or just pop by to tell me it’s rubbish, I’m here. [https://crates.io/crates/lucyd](https://crates.io/crates/lucyd) [https://github.com/Jeck0v/Lucyd](https://github.com/Jeck0v/Lucyd) ## Similar posts on daily.dev - [Axum Support in RustRover 2026.2: Build Web Backends Faster](https://daily.dev/posts/axum-support-in-rustrover-2026-2-build-web-backends-faster-u26dy7lsd) · JetBrains · 9 upvotes · 0 comments - [Build a Rust AI Agent Gateway with Tokio and Axum](https://daily.dev/posts/build-a-rust-ai-agent-gateway-with-tokio-and-axum-4xfsvkj3f) · SitePoint · 2 upvotes · 0 comments - [Introducing Umbral - A Batteries-Included Web Framework for Rust](https://daily.dev/posts/introducing-umbral---a-batteries-included-web-framework-for-rust-eqdvlniil) · Medium · 0 upvotes · 0 comments - [CouncilEx — CouncilEx v0.1.0](https://daily.dev/posts/councilex-councilex-v0-1-0-nukdawyh8) · ElixirStatus · 0 upvotes · 1 comments - [Lies, damned lies, and Rust in the TechEmpower Web Framework Benchmarks](https://daily.dev/posts/lies-damned-lies-and-rust-in-the-techempower-web-framework-benchmarks-ilvvsyqxm) · Sylvain Kerkour · 3 upvotes · 2 comments --- Tags: [#testing](https://daily.dev/tags/testing), [#backend](https://daily.dev/tags/backend), [#rust](https://daily.dev/tags/rust) [View this post on daily.dev](https://daily.dev/posts/lucyd---auto-doc-testing-for-axum-routes-http-websocket-mqtt--rfxu1yjyy) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/lucyd---auto-doc-testing-for-axum-routes-http-websocket-mqtt--rfxu1yjyy","headline":"Lucyd - Auto-doc & testing for Axum routes (HTTP, WebSocket, MQTT)","text":"Lucyd is a new Rust crate that centralizes documentation and testing for Axum-based backends supporting HTTP, WebSocket, and MQTT protocols in a single structured project. 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