Rocket | 04 , Dynamic Paths

Mike Code

1 min read

·

Sep 29, 2026

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We can declare dynamic path segments in route’s path by using angle brackets around variable names

（Youtube Video）

use rocket::{ get, routes};

#[rocket::main]
async fn main() {
    rocket::build().mount("/", routes![index]).launch().await.unwrap();
}

#[get("/user/<id>")]
fn index(id: i32) -> String {
    format!("id: {}", id)
}

In index handler , we give it path start with /user/ , after the first segment , is dynamic path segment , id is variable name , we put id in a pair of angle brackets

Then in handler , we add a parameter with type annotation. And parameter’s name must be the same as variable’s name in the dynamic path segment .

Last we mount this handler to rocket server.

When we visit /user/1 , it will send a response id: 1 ; if we visit /user/2 , response will be id: 2 .

We also can add multiple dynamic segments in one path:

#[get("/user/<id>/<name>")]
fn index(id : i32, name: String) -> String {
    format!("id: {}, name: {}", id, name)
}