Struct actix_web::web::Json

pub struct Json<T>(pub T);

Json helper

Json can be used for two different purpose. First is for json response generation and second is for extracting typed information from request’s payload.

To extract typed information from request’s body, the type T must implement the Deserialize trait from serde.

JsonConfig allows to configure extraction process.

Example

use actix_web::{web, App};
use serde_derive::Deserialize;

#[derive(Deserialize)]
struct Info {
    username: String,
}

/// deserialize `Info` from request's body
async fn index(info: web::Json<Info>) -> String {
    format!("Welcome {}!", info.username)
}

fn main() {
    let app = App::new().service(
       web::resource("/index.html").route(
           web::post().to(index))
    );
}

The Json type allows you to respond with well-formed JSON data: simply return a value of type Json where T is the type of a structure to serialize into JSON. The type T must implement the Serialize trait from serde.

use actix_web::*;
use serde_derive::Serialize;

#[derive(Serialize)]
struct MyObj {
    name: String,
}

fn index(req: HttpRequest) -> Result<web::Json<MyObj>> {
    Ok(web::Json(MyObj {
        name: req.match_info().get("name").unwrap().to_string(),
    }))
}

Tuple Fields

0: T

Implementations

impl<T> Json<T>

pub fn into_inner(self) -> T

Deconstruct to an inner value

Trait Implementations

impl<T> Debug for Json<T> where
    T: Debug, 

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> Deref for Json<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T> DerefMut for Json<T>

fn deref_mut(&mut self) -> &mut T

Mutably dereferences the value.

impl<T> Display for Json<T> where
    T: Display, 

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> FromRequest for Json<T> where
    T: DeserializeOwned + 'static, 

Json extractor. Allow to extract typed information from request’s payload.

To extract typed information from request’s body, the type T must implement the Deserialize trait from serde.

JsonConfig allows to configure extraction process.

Example

use actix_web::{web, App};
use serde_derive::Deserialize;

#[derive(Deserialize)]
struct Info {
    username: String,
}

/// deserialize `Info` from request's body
async fn index(info: web::Json<Info>) -> String {
    format!("Welcome {}!", info.username)
}

fn main() {
    let app = App::new().service(
        web::resource("/index.html").route(
           web::post().to(index))
    );
}

type Error = Error

The associated error which can be returned.

type Future = LocalBoxFuture<'static, Result<Self, Error>>

Future that resolves to a Self

type Config = JsonConfig

Configuration for this extractor

fn from_request(req: &HttpRequest, payload: &mut Payload) -> Self::Future

Convert request to a Self

fn extract(req: &HttpRequest) -> Self::Future

Convert request to a Self

fn configure<F>(f: F) -> Self::Config where
    F: FnOnce(Self::Config) -> Self::Config, 

Create and configure config instance.

impl<T: Serialize> Responder for Json<T>

type Error = Error

The associated error which can be returned.

type Future = Ready<Result<Response, Error>>

The future response value.

fn respond_to(self, _: &HttpRequest) -> Self::Future

Convert itself to AsyncResult or Error.

fn with_status(self, status: StatusCode) -> CustomResponder<Self> where
    Self: Sized, 

Override a status code for a Responder.

fn with_header<K, V>(self, key: K, value: V) -> CustomResponder<Self> where
    Self: Sized,
    HeaderName: TryFrom<K>,
    <HeaderName as TryFrom<K>>::Error: Into<HttpError>,
    V: IntoHeaderValue, 

Add header to the Responder’s response.