[][src]Struct serde_json::error::Error

pub struct Error { /* fields omitted */ }

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

Methods

impl Error[src]

pub fn line(&self) -> usize[src]

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.

pub fn column(&self) -> usize[src]

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 IO stream fails immediately following a previously read newline character.

pub fn classify(&self) -> Category[src]

Categorizes the cause of this error.

  • Category::Io - failure to read or write bytes on an IO 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

pub fn is_io(&self) -> bool[src]

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

pub fn is_syntax(&self) -> bool[src]

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

pub fn is_data(&self) -> bool[src]

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.

pub fn is_eof(&self) -> bool[src]

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.

Trait Implementations

impl From<Error> for Error[src]

fn from(j: Error) -> Self[src]

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

JSON syntax and data errors are turned into InvalidData IO errors. EOF errors are turned into UnexpectedEof IO errors.

This code runs with edition 2018
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)
            }
        }
    }
}

impl Display for Error[src]

impl Debug for Error[src]

impl Error for Error[src]

fn source(&self) -> Option<&(dyn Error + 'static)>
1.30.0
[src]

The lower-level source of this error, if any. Read more

impl Error for Error[src]

impl Error for Error[src]

fn invalid_value(unexp: Unexpected, exp: &dyn Expected) -> Self[src]

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

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

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

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

Raised when a Deserialize enum type received a variant with an unrecognized name. Read more

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

Raised when a Deserialize struct type received a field with an unrecognized name. Read more

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

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. Read more

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

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

Auto Trait Implementations

impl Send for Error

impl Sync for Error

Blanket Implementations

impl<T> From for T[src]

impl<T, U> Into for T where
    U: From<T>, 
[src]

impl<T> ToString for T where
    T: Display + ?Sized
[src]

impl<T, U> TryFrom for T where
    U: Into<T>, 
[src]

type Error = !

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized
[src]

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> BorrowMut for T where
    T: ?Sized
[src]

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
[src]

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

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.