Struct serde_json::error::Error

source ·
pub struct Error { /* private fields */ }
Expand description

This type represents all possible errors that can occur when serializing or deserializing JSON data.

Implementations§

source§

impl Error

source

pub fn line(&self) -> usize

One-based line number at which the error was detected.

Characters in the first line of the input (before the first newline character) are in line 1.

source

pub fn column(&self) -> usize

One-based column number at which the error was detected.

The first character in the input and any characters immediately following a newline character are in column 1.

Note that errors may occur in column 0, for example if a read from an I/O stream fails immediately following a previously read newline character.

source

pub fn classify(&self) -> Category

Categorizes the cause of this error.

  • Category::Io - failure to read or write bytes on an I/O stream
  • Category::Syntax - input that is not syntactically valid JSON
  • Category::Data - input data that is semantically incorrect
  • Category::Eof - unexpected end of the input data
source

pub fn is_io(&self) -> bool

Returns true if this error was caused by a failure to read or write bytes on an I/O stream.

source

pub fn is_syntax(&self) -> bool

Returns true if this error was caused by input that was not syntactically valid JSON.

source

pub fn is_data(&self) -> bool

Returns true if this error was caused by input data that was semantically incorrect.

For example, JSON containing a number is semantically incorrect when the type being deserialized into holds a String.

source

pub fn is_eof(&self) -> bool

Returns true if this error was caused by prematurely reaching the end of the input data.

Callers that process streaming input may be interested in retrying the deserialization once more data is available.

source

pub fn io_error_kind(&self) -> Option<ErrorKind>

The kind reported by the underlying standard library I/O error, if this error was caused by a failure to read or write bytes on an I/O stream.

§Example
use serde_json::Value;
use std::io::{self, ErrorKind, Read};
use std::process;

struct ReaderThatWillTimeOut<'a>(&'a [u8]);

impl<'a> Read for ReaderThatWillTimeOut<'a> {
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        if self.0.is_empty() {
            Err(io::Error::new(ErrorKind::TimedOut, "timed out"))
        } else {
            self.0.read(buf)
        }
    }
}

fn main() {
    let reader = ReaderThatWillTimeOut(br#" {"k": "#);

    let _: Value = match serde_json::from_reader(reader) {
        Ok(value) => value,
        Err(error) => {
            if error.io_error_kind() == Some(ErrorKind::TimedOut) {
                // Maybe this application needs to retry certain kinds of errors.

            } else {
                eprintln!("error: {}", error);
                process::exit(1);
            }
        }
    };
}

Trait Implementations§

source§

impl Debug for Error

source§

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

Formats the value using the given formatter. Read more
source§

impl Display for Error

source§

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

Formats the value using the given formatter. Read more
source§

impl Error for Error

source§

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any. Read more
1.0.0 · source§

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
1.0.0 · source§

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
source§

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)
Provides type-based access to context intended for error reports. Read more
source§

impl Error for Error

source§

fn custom<T: Display>(msg: T) -> Error

Raised when there is general error when deserializing a type. Read more
source§

fn invalid_type(unexp: Unexpected<'_>, exp: &dyn Expected) -> Self

Raised when a Deserialize receives a type different from what it was expecting. Read more
source§

fn invalid_value(unexp: Unexpected<'_>, exp: &dyn Expected) -> Self

Raised when a Deserialize receives a value of the right type but that is wrong for some other reason. Read more
source§

fn invalid_length(len: usize, exp: &dyn Expected) -> Self

Raised when deserializing a sequence or map and the input data contains too many or too few elements. Read more
source§

fn unknown_variant(variant: &str, expected: &'static [&'static str]) -> Self

Raised when a Deserialize enum type received a variant with an unrecognized name.
source§

fn unknown_field(field: &str, expected: &'static [&'static str]) -> Self

Raised when a Deserialize struct type received a field with an unrecognized name.
source§

fn missing_field(field: &'static str) -> Self

Raised when a Deserialize struct type expected to receive a required field with a particular name but that field was not present in the input.
source§

fn duplicate_field(field: &'static str) -> Self

Raised when a Deserialize struct type received more than one of the same field.
source§

impl Error for Error

source§

fn custom<T: Display>(msg: T) -> Error

Used when a Serialize implementation encounters any error while serializing a type. Read more
source§

impl From<Error> for Error

source§

fn from(j: Error) -> Self

Convert a serde_json::Error into an io::Error.

JSON syntax and data errors are turned into InvalidData I/O errors. EOF errors are turned into UnexpectedEof I/O errors.

use std::io;

enum MyError {
    Io(io::Error),
    Json(serde_json::Error),
}

impl From<serde_json::Error> for MyError {
    fn from(err: serde_json::Error) -> MyError {
        use serde_json::error::Category;
        match err.classify() {
            Category::Io => {
                MyError::Io(err.into())
            }
            Category::Syntax | Category::Data | Category::Eof => {
                MyError::Json(err)
            }
        }
    }
}
source§

impl<'de> IntoDeserializer<'de, Error> for &'de RawValue

§

type Deserializer = &'de RawValue

The type of the deserializer being converted into.
source§

fn into_deserializer(self) -> Self::Deserializer

Convert this value into a deserializer.
source§

impl<'de> IntoDeserializer<'de, Error> for &'de Value

§

type Deserializer = &'de Value

The type of the deserializer being converted into.
source§

fn into_deserializer(self) -> Self::Deserializer

Convert this value into a deserializer.
source§

impl<'de> IntoDeserializer<'de, Error> for Value

§

type Deserializer = Value

The type of the deserializer being converted into.
source§

fn into_deserializer(self) -> Self::Deserializer

Convert this value into a deserializer.

Auto Trait Implementations§

§

impl Freeze for Error

§

impl !RefUnwindSafe for Error

§

impl Send for Error

§

impl Sync for Error

§

impl Unpin for Error

§

impl !UnwindSafe for Error

Blanket Implementations§

source§

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

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

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

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for T
where U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

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

source§

impl<T> ToString for T
where T: Display + ?Sized,

source§

default fn to_string(&self) -> String

Converts the given value to a String. Read more
source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

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

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.