Function warp::filters::body::json

pub fn json<T: DeserializeOwned + Send>(
) -> impl Filter<Extract = (T,), Error = Rejection> + Copy

Returns a Filter that matches any request and extracts a Future of a JSON-decoded body.

Warning

This does not have a default size limit, it would be wise to use one to prevent a overly large request from using too much memory.

Example

use std::collections::HashMap;
use warp::Filter;

let route = warp::body::content_length_limit(1024 * 32)
    .and(warp::body::json())
    .map(|simple_map: HashMap<String, String>| {
        "Got a JSON body!"
    });

Examples found in repository

examples/todos.rs (line 106)

    fn json_body() -> impl Filter<Extract = (Todo,), Error = warp::Rejection> + Clone {
        // When accepting a body, we want a JSON body
        // (and to reject huge payloads)...
        warp::body::content_length_limit(1024 * 16).and(warp::body::json())
    }

examples/body.rs (line 23)

↕

async fn main() {
    pretty_env_logger::init();

    // POST /employees/:rate  {"name":"Sean","rate":2}
    let promote = warp::post()
        .and(warp::path("employees"))
        .and(warp::path::param::<u32>())
        // Only accept bodies smaller than 16kb...
        .and(warp::body::content_length_limit(1024 * 16))
        .and(warp::body::json())
        .map(|rate, mut employee: Employee| {
            employee.rate = rate;
            warp::reply::json(&employee)
        });

    warp::serve(promote).run(([127, 0, 0, 1], 3030)).await
}

examples/rejections.rs (line 28)

↕

async fn main() {
    let math = warp::path!("math" / u16);
    let div_with_header = math
        .and(warp::get())
        .and(div_by())
        .map(|num: u16, denom: NonZeroU16| {
            warp::reply::json(&Math {
                op: format!("{} / {}", num, denom),
                output: num / denom.get(),
            })
        });

    let div_with_body =
        math.and(warp::post())
            .and(warp::body::json())
            .map(|num: u16, body: DenomRequest| {
                warp::reply::json(&Math {
                    op: format!("{} / {}", num, body.denom),
                    output: num / body.denom.get(),
                })
            });

    let routes = div_with_header.or(div_with_body).recover(handle_rejection);

    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
}