Rust Web APIs — Building REST APIs with Axum, SQLx, and Validated Input

DodaTech Updated 2026-06-28 1 min read

In this tutorial, you will learn about Rust Web APIs. We cover key concepts, practical examples, and best practices to help you master this topic.

Rust web APIs combine Axum for routing, SQLx for database access, and serde for JSON with validation and OpenAPI documentation.

What You'll Learn

Axum request handlers
SQLx database queries
Request validation
OpenAPI docs

Why It Matters

Rust APIs are fast and type-safe. DodaZIP uses Axum for its REST API.

Real-World Use

High-performance APIs, data services, Microservices.

[dependencies]
axum = "0.7"
tokio = { version = "1", features = ["full"] }
serde = { version = "1.0", features = ["derive"] }
sqlx = { version = "0.7", features = ["runtime-tokio", "postgres"] }
tower-http = { version = "0.5", features = ["cors"] }

use axum::{
    extract::{Path, Query, State},
    http::StatusCode,
    response::IntoResponse,
    routing::get,
    Json, Router,
};
use serde::{Deserialize, Serialize};
use std::sync::Arc;
use sqlx::PgPool;

#[derive(Serialize, Deserialize)]
struct User {
    id: i32,
    name: String,
    email: String,
}

#[derive(Deserialize)]
struct CreateUser {
    name: String,
    email: String,
}

async fn list_users(State(pool): State<Arc<PgPool>>) -> impl IntoResponse {
    let users = sqlx::query_as::<_, User>("SELECT * FROM users")
        .fetch_all(&*pool).await;
    Json(users.unwrap_or_default())
}

async fn create_user(
    State(pool): State<Arc<PgPool>>,
    Json(input): Json<CreateUser>,
) -> impl IntoResponse {
    let user = sqlx::query_as::<_, User>(
        "INSERT INTO users (name, email) VALUES ($1, $2) RETURNING *"
    )
    .bind(&input.name)
    .bind(&input.email)
    .fetch_one(&*pool).await;

    match user {
        Ok(u) => (StatusCode::CREATED, Json(u)).into_response(),
        Err(e) => (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()).into_response(),
    }
}

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