Struct Json

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pub struct Json<T>(pub T);
Expand description

JSON extractor and responder.

Json has two uses: JSON responses, and extracting typed data from JSON request payloads.

§Extractor

To extract typed data from a request body, the inner type T must implement the serde::Deserialize trait.

Use JsonConfig to configure extraction options.

use actix_web::{post, web, App};
use serde::Deserialize;

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

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

§Responder

The Json type JSON formatted responses. A handler may return a value of type Json<T> where T is the type of a structure to serialize into JSON. The type T must implement serde::Serialize.

use actix_web::{post, web, HttpRequest};
use serde::Serialize;

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

#[post("/{name}")]
async fn index(req: HttpRequest) -> web::Json<Info> {
    web::Json(Info {
        name: req.match_info().get("name").unwrap().to_owned(),
    })
}

Tuple Fields§

§0: T

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impl<T> Json<T>

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pub fn into_inner(self) -> T

Unwrap into inner T value.

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

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

Formats the value using the given formatter. Read more
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impl<T> Deref for Json<T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &T

Dereferences the value.
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impl<T> DerefMut for Json<T>

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

Mutably dereferences the value.
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impl<T: Display> Display for Json<T>

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

Formats the value using the given formatter. Read more
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impl<T: DeserializeOwned> FromRequest for Json<T>

See here for example of usage as an extractor.

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type Error = Error

The associated error which can be returned.
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type Future = JsonExtractFut<T>

Future that resolves to a Self. Read more
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fn from_request(req: &HttpRequest, payload: &mut Payload) -> Self::Future

Create a Self from request parts asynchronously.
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fn extract(req: &HttpRequest) -> Self::Future

Create a Self from request head asynchronously. Read more
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impl<T: Serialize> Responder for Json<T>

Creates response with OK status code, correct content type header, and serialized JSON payload.

If serialization failed

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type Body = EitherBody<String>

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fn respond_to(self, _: &HttpRequest) -> HttpResponse<Self::Body>

Convert self to HttpResponse.
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fn customize(self) -> CustomizeResponder<Self>
where Self: Sized,

Wraps responder to allow alteration of its response. Read more
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impl<T: Serialize> Serialize for Json<T>

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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer,

Serialize this value into the given Serde serializer. Read more

Auto Trait Implementations§

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

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

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

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

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

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

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

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type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)
The target type on which the method may be called.
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impl<T, P> Resource for T
where T: DerefMut<Target = Path<P>>, P: ResourcePath,

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type Path = P

Type of resource’s path returned in resource_path.
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fn resource_path(&mut self) -> &mut Path<<T as Resource>::Path>

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impl<R> Rng for R
where R: RngCore + ?Sized,

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fn random<T>(&mut self) -> T

Return a random value via the StandardUniform distribution. Read more
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fn random_iter<T>(self) -> Iter<StandardUniform, Self, T>

Return an iterator over random variates Read more
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fn random_range<T, R>(&mut self, range: R) -> T
where T: SampleUniform, R: SampleRange<T>,

Generate a random value in the given range. Read more
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fn random_bool(&mut self, p: f64) -> bool

Return a bool with a probability p of being true. Read more
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fn random_ratio(&mut self, numerator: u32, denominator: u32) -> bool

Return a bool with a probability of numerator/denominator of being true. Read more
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fn sample<T, D>(&mut self, distr: D) -> T
where D: Distribution<T>,

Sample a new value, using the given distribution. Read more
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fn sample_iter<T, D>(self, distr: D) -> Iter<D, Self, T>
where D: Distribution<T>, Self: Sized,

Create an iterator that generates values using the given distribution. Read more
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fn fill<T>(&mut self, dest: &mut T)
where T: Fill + ?Sized,

Fill any type implementing Fill with random data Read more
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fn gen<T>(&mut self) -> T

👎Deprecated since 0.9.0: Renamed to random to avoid conflict with the new gen keyword in Rust 2024.
Alias for Rng::random.
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fn gen_range<T, R>(&mut self, range: R) -> T
where T: SampleUniform, R: SampleRange<T>,

👎Deprecated since 0.9.0: Renamed to random_range
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fn gen_bool(&mut self, p: f64) -> bool

👎Deprecated since 0.9.0: Renamed to random_bool
Alias for Rng::random_bool.
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fn gen_ratio(&mut self, numerator: u32, denominator: u32) -> bool

👎Deprecated since 0.9.0: Renamed to random_ratio
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impl<T> RngCore for T
where T: DerefMut, <T as Deref>::Target: RngCore,

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fn next_u32(&mut self) -> u32

Return the next random u32. Read more
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fn next_u64(&mut self) -> u64

Return the next random u64. Read more
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fn fill_bytes(&mut self, dst: &mut [u8])

Fill dest with random data. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToString for T
where T: Display + ?Sized,

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fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<R> TryRngCore for R
where R: RngCore + ?Sized,

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type Error = Infallible

The type returned in the event of a RNG error.
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fn try_next_u32(&mut self) -> Result<u32, <R as TryRngCore>::Error>

Return the next random u32.
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fn try_next_u64(&mut self) -> Result<u64, <R as TryRngCore>::Error>

Return the next random u64.
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fn try_fill_bytes( &mut self, dst: &mut [u8], ) -> Result<(), <R as TryRngCore>::Error>

Fill dest entirely with random data.
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fn unwrap_err(self) -> UnwrapErr<Self>
where Self: Sized,

Wrap RNG with the UnwrapErr wrapper.
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fn unwrap_mut(&mut self) -> UnwrapMut<'_, Self>

Wrap RNG with the UnwrapMut wrapper.
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fn read_adapter(&mut self) -> RngReadAdapter<'_, Self>
where Self: Sized,

Available on crate feature std only.
Convert an RngCore to a RngReadAdapter.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> CryptoRng for T
where T: DerefMut, <T as Deref>::Target: CryptoRng,

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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> Formattable for T
where T: Deref, <T as Deref>::Target: Formattable,

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impl<T> MaybeSendSync for T

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impl<T> Parsable for T
where T: Deref, <T as Deref>::Target: Parsable,

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impl<R> TryCryptoRng for R
where R: CryptoRng + ?Sized,