Struct actix_web::web::Json [−][src]
pub struct Json<T>(pub T);
Expand description
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 JsonT
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
Deconstruct to an inner value
Trait Implementations
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 Future = LocalBoxFuture<'static, Result<Self, Error>>
type Future = LocalBoxFuture<'static, Result<Self, Error>>
Future that resolves to a Self
type Config = JsonConfig
type Config = JsonConfig
Configuration for this extractor
Convert request to a Self
Convert request to a Self Read more
Convert itself to AsyncResult
or Error
.
Override a status code for a Responder. Read more
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,
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. Read more
Auto Trait Implementations
impl<T> RefUnwindSafe for Json<T> where
T: RefUnwindSafe,
impl<T> UnwindSafe for Json<T> where
T: UnwindSafe,
Blanket Implementations
Mutably borrows from an owned value. Read more
Instruments this type with the provided Span
, returning an
Instrumented
wrapper. Read more
Instruments this type with the provided Span
, returning an
Instrumented
wrapper. Read more
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more