30-Day Rust API Challenge (One Day, One API)

Welcome! This challenge helps you learn Rust by building a new mini-API every day using Axum, one concept at a time.

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Week 1 – Core Rust + Axum Basics

• Day 1: Hello World API (GET /)
• Day 2: Path Parameters (GET /hello/:name)
• Day 3: Extractor: Query Params (GET /sum?a=1&b=2)
• Day 4: Extractor: JSON Body (POST /echo)
• Day 5: Multiple REST Methods (GET, POST, PUT, DELETE /item)
• Day 6: Return Different Response Types (Plain Text, JSON, Custom Status)
• Day 7: Axum Router Nesting and Route Grouping

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Week 2 – Middleware, Error Handling, and Auth

• Day 8: Logging middleware (tower-http)
• Day 9: Enable CORS for Frontend Access
• Day 10: Rate Limiting (Basic Token Bucket or Counter)
• Day 11: Custom Error Types and Global Error Handler
• Day 12: JWT Authentication (Mock, Header Parsing)
• Day 13: Session With Cookies (or Local State)
• Day 14: Load Environment Variables (dotenvy)

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Week 3 – Storage & State

• Day 15: SQLite Integration with sqlx
• Day 16: PostgreSQL Example
• Day 17: Redis Visit Counter
• Day 18: File Upload API
• Day 19: Serve Static Files (/static/logo.png)
• Day 20: Shared Global State with Arc<Mutex<T>>
• Day 21: Current Timestamp API

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Week 4 – Tools, Testing, Deploy

• Day 22: JSON → CSV Converter API
• Day 23: Image Resize API
• Day 24: PDF Metadata Extractor
• Day 25: Async Background Task
• Day 26: Unit Test a Handler
• Day 27: Generate Swagger (OpenAPI)
• Day 28: Dockerize the API
• Day 29: Freestyle Day – Build your own
• Day 30: Deploy to Fly.io or Render idea!

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Crates to Explore

• axum, tokio, tower, tower-http
• serde, serde_json, uuid
• sqlx, sea-orm, redis
• dotenvy, utoipa

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Tips:

• Use cargo new day_XX to start fresh daily.
• Use cargo add <package> to add package dependencies to Cargo.toml
• Run cargo install cargo-watch and use cargo watch -x run to live-reload during dev.
• Use curl or httpie to test quickly.
• Feel free to mix in your own ideas!

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Happy hacking and welcome to the Rustacean life 🦀🔥