Enum inapi::Value

pub enum Value {
    Null,
    Bool(bool),
    Number(Number),
    String(String),
    Array(Vec<Value>),
    Object(Map<String, Value>),
}

Represents any valid JSON value.

Variants

Null

Represents a JSON null value.

Bool(bool)

Represents a JSON boolean.

Number(Number)

Represents a JSON number, whether integer or floating point.

String(String)

Represents a JSON string.

Array(Vec<Value>)

Represents a JSON array.

Object(Map<String, Value>)

Represents a JSON object.

Methods

impl Value

fn get<I>(&self, index: I) -> Option<&Value> where
    I: Index, 

Index into a JSON array or map. A string index can be used to access a value in a map, and a usize index can be used to access an element of an array.

Returns None if the type of self does not match the type of the index, for example if the index is a string and self is an array or a number. Also returns None if the given key does not exist in the map or the given index is not within the bounds of the array.

let object = json!({ "A": 65, "B": 66, "C": 67 });
assert_eq!(*object.get("A").unwrap(), json!(65));

let array = json!([ "A", "B", "C" ]);
assert_eq!(*array.get(2).unwrap(), json!("C"));

assert_eq!(array.get("A"), None);

Square brackets can also be used to index into a value in a more concise way. This returns Value::Null in cases where get would have returned None.

let object = json!({
    "A": ["a", "á", "à"],
    "B": ["b", "b́"],
    "C": ["c", "ć", "ć̣", "ḉ"],
});
assert_eq!(object["B"][0], json!("b"));

assert_eq!(object["D"], json!(null));
assert_eq!(object[0]["x"]["y"]["z"], json!(null));

fn get_mut<I>(&mut self, index: I) -> Option<&mut Value> where
    I: Index, 

Mutably index into a JSON array or map. A string index can be used to access a value in a map, and a usize index can be used to access an element of an array.

Returns None if the type of self does not match the type of the index, for example if the index is a string and self is an array or a number. Also returns None if the given key does not exist in the map or the given index is not within the bounds of the array.

let mut object = json!({ "A": 65, "B": 66, "C": 67 });
*object.get_mut("A").unwrap() = json!(69);

let mut array = json!([ "A", "B", "C" ]);
*array.get_mut(2).unwrap() = json!("D");

fn is_object(&self) -> bool

Returns true if the Value is an Object. Returns false otherwise.

fn as_object(&self) -> Option<&Map<String, Value>>

If the Value is an Object, returns the associated Map. Returns None otherwise.

fn as_object_mut(&mut self) -> Option<&mut Map<String, Value>>

If the Value is an Object, returns the associated mutable Map. Returns None otherwise.

fn is_array(&self) -> bool

Returns true if the Value is an Array. Returns false otherwise.

fn as_array(&self) -> Option<&Vec<Value>>

If the Value is an Array, returns the associated vector. Returns None otherwise.

fn as_array_mut(&mut self) -> Option<&mut Vec<Value>>

If the Value is an Array, returns the associated mutable vector. Returns None otherwise.

fn is_string(&self) -> bool

Returns true if the Value is a String. Returns false otherwise.

fn as_str(&self) -> Option<&str>

If the Value is a String, returns the associated str. Returns None otherwise.

fn is_number(&self) -> bool

Returns true if the Value is a Number. Returns false otherwise.

fn is_i64(&self) -> bool

Returns true if the Value is a number that can be represented by i64.

fn is_u64(&self) -> bool

Returns true if the Value is a number that can be represented by u64.

fn is_f64(&self) -> bool

Returns true if the Value is a number that can be represented by f64.

fn as_i64(&self) -> Option<i64>

If the Value is a number, represent it as i64 if possible. Returns None otherwise.

fn as_u64(&self) -> Option<u64>

If the Value is a number, represent it as u64 if possible. Returns None otherwise.

fn as_f64(&self) -> Option<f64>

If the Value is a number, represent it as f64 if possible. Returns None otherwise.

fn is_boolean(&self) -> bool

Returns true if the Value is a Boolean. Returns false otherwise.

fn as_bool(&self) -> Option<bool>

If the Value is a Boolean, returns the associated bool. Returns None otherwise.

fn is_null(&self) -> bool

Returns true if the Value is a Null. Returns false otherwise.

fn as_null(&self) -> Option<()>

If the Value is a Null, returns (). Returns None otherwise.

fn pointer(&'a self, pointer: &str) -> Option<&'a Value>

Looks up a value by a JSON Pointer.

JSON Pointer defines a string syntax for identifying a specific value within a JavaScript Object Notation (JSON) document.

A Pointer is a Unicode string with the reference tokens separated by /. Inside tokens / is replaced by ~1 and ~ is replaced by ~0. The addressed value is returned and if there is no such value None is returned.

For more information read RFC6901.

Examples

let data = json!({
    "x": {
        "y": ["z", "zz"]
    }
});

assert_eq!(data.pointer("/x/y/1").unwrap(), &json!("zz"));
assert_eq!(data.pointer("/a/b/c"), None);

fn pointer_mut(&'a mut self, pointer: &str) -> Option<&'a mut Value>

Looks up a value by a JSON Pointer and returns a mutable reference to that value.

JSON Pointer defines a string syntax for identifying a specific value within a JavaScript Object Notation (JSON) document.

A Pointer is a Unicode string with the reference tokens separated by /. Inside tokens / is replaced by ~1 and ~ is replaced by ~0. The addressed value is returned and if there is no such value None is returned.

For more information read RFC6901.

Example of Use

extern crate serde_json;

use serde_json::Value;
use std::mem;

fn main() {
    let s = r#"{"x": 1.0, "y": 2.0}"#;
    let mut value: Value = serde_json::from_str(s).unwrap();

    // Check value using read-only pointer
    assert_eq!(value.pointer("/x"), Some(&1.0.into()));
    // Change value with direct assignment
    *value.pointer_mut("/x").unwrap() = 1.5.into();
    // Check that new value was written
    assert_eq!(value.pointer("/x"), Some(&1.5.into()));

    // "Steal" ownership of a value. Can replace with any valid Value.
    let old_x = value.pointer_mut("/x").map(|x| mem::replace(x, Value::Null)).unwrap();
    assert_eq!(old_x, 1.5);
    assert_eq!(value.pointer("/x").unwrap(), &Value::Null);
}

Trait Implementations

impl<I> Index<I> for Value where
    I: Index, 

type Output = Value

fn index(&self, index: I) -> &Value

Index into a serde_json::Value using the syntax value[0] or value["k"].

Returns Value::Null if the type of self does not match the type of the index, for example if the index is a string and self is an array or a number. Also returns Value::Null if the given key does not exist in the map or the given index is not within the bounds of the array.

For retrieving deeply nested values, you should have a look at the Value::pointer method.

Examples

let data = json!({
    "x": {
        "y": ["z", "zz"]
    }
});

assert_eq!(data["x"]["y"], json!(["z", "zz"]));
assert_eq!(data["x"]["y"][0], json!("z"));

assert_eq!(data["a"], json!(null)); // returns null for undefined values
assert_eq!(data["a"]["b"], json!(null)); // does not panic

impl FromStr for Value

type Err = Error

fn from_str(s: &str) -> Result<Value, Error>

impl Clone for Value

fn clone(&self) -> Value

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Value

fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl Display for Value

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

Display a JSON value as a string.

let json = json!({ "city": "London", "street": "10 Downing Street" });

// Compact format:
//
// {"city":"London","street":"10 Downing Street"}
let compact = format!("{}", json);
assert_eq!(compact,
    "{\"city\":\"London\",\"street\":\"10 Downing Street\"}");

// Pretty format:
//
// {
//   "city": "London",
//   "street": "10 Downing Street"
// }
let pretty = format!("{:#}", json);
assert_eq!(pretty,
    "{\n  \"city\": \"London\",\n  \"street\": \"10 Downing Street\"\n}");

impl<T> FromIterator<T> for Value where
    T: Into<Value>, 

fn from_iter<I>(iter: I) -> Value where
    I: IntoIterator<Item = T>, 

Convert an iteratable type to a Value

Examples

use serde_json::Value;

let v = std::iter::repeat(42).take(5);
let x: Value = v.collect();

use serde_json::Value;

let v: Vec<_> = vec!["lorem", "ipsum", "dolor"];
let x: Value = v.into_iter().collect();

use std::iter::FromIterator;
use serde_json::Value;

let x: Value = Value::from_iter(vec!["lorem", "ipsum", "dolor"]);

impl<'a> PartialEq<i32> for &'a Value

fn eq(&self, other: &i32) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<i8> for &'a Value

fn eq(&self, other: &i8) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<u8> for &'a Value

fn eq(&self, other: &u8) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<i8> for Value

fn eq(&self, other: &i8) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<f32> for &'a mut Value

fn eq(&self, other: &f32) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<f64> for &'a mut Value

fn eq(&self, other: &f64) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<i32> for Value

fn eq(&self, other: &i32) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<usize> for &'a Value

fn eq(&self, other: &usize) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<f64> for &'a Value

fn eq(&self, other: &f64) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<Value> for Value

fn eq(&self, __arg_0: &Value) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &Value) -> bool

This method tests for !=.

impl PartialEq<u16> for Value

fn eq(&self, other: &u16) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<u8> for &'a mut Value

fn eq(&self, other: &u8) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<str> for Value

fn eq(&self, other: &str) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<i16> for &'a mut Value

fn eq(&self, other: &i16) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<u16> for &'a mut Value

fn eq(&self, other: &u16) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<i64> for Value

fn eq(&self, other: &i64) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<u32> for &'a mut Value

fn eq(&self, other: &u32) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<isize> for &'a Value

fn eq(&self, other: &isize) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<u32> for Value

fn eq(&self, other: &u32) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<f64> for Value

fn eq(&self, other: &f64) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<f32> for &'a Value

fn eq(&self, other: &f32) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<u32> for &'a Value

fn eq(&self, other: &u32) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<i32> for &'a mut Value

fn eq(&self, other: &i32) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<String> for Value

fn eq(&self, other: &String) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<usize> for &'a mut Value

fn eq(&self, other: &usize) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<i8> for &'a mut Value

fn eq(&self, other: &i8) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<i64> for &'a Value

fn eq(&self, other: &i64) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<u64> for &'a mut Value

fn eq(&self, other: &u64) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<u64> for Value

fn eq(&self, other: &u64) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<isize> for &'a mut Value

fn eq(&self, other: &isize) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<i64> for &'a mut Value

fn eq(&self, other: &i64) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<isize> for Value

fn eq(&self, other: &isize) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<i16> for &'a Value

fn eq(&self, other: &i16) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<&'a str> for Value

fn eq(&self, other: &&str) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<usize> for Value

fn eq(&self, other: &usize) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<u64> for &'a Value

fn eq(&self, other: &u64) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<u8> for Value

fn eq(&self, other: &u8) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<i16> for Value

fn eq(&self, other: &i16) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<'a> PartialEq<u16> for &'a Value

fn eq(&self, other: &u16) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialEq<f32> for Value

fn eq(&self, other: &f32) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Serialize for Value

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

impl From<u32> for Value

fn from(n: u32) -> Value

Performs the conversion.

impl From<u16> for Value

fn from(n: u16) -> Value

Performs the conversion.

impl From<String> for Value

fn from(f: String) -> Value

Convert String to Value

Examples

use serde_json::Value;

let s: String = "lorem".to_string();
let x: Value = s.into();

impl From<f64> for Value

fn from(f: f64) -> Value

Convert 64-bit floating point number to Value

Examples

use serde_json::Value;

let f: f64 = 13.37;
let x: Value = f.into();

impl From<f32> for Value

fn from(f: f32) -> Value

Convert 32-bit floating point number to Value

Examples

use serde_json::Value;

let f: f32 = 13.37;
let x: Value = f.into();

impl From<Map<String, Value>> for Value

fn from(f: Map<String, Value>) -> Value

Convert map (with string keys) to Value

Examples

use serde_json::{Map, Value};

let mut m = Map::new();
m.insert("Lorem".to_string(), "ipsum".into());
let x: Value = m.into();

impl<'a> From<&'a str> for Value

fn from(f: &str) -> Value

Convert string slice to Value

Examples

use serde_json::Value;

let s: &str = "lorem";
let x: Value = s.into();

impl<'a, T> From<&'a [T]> for Value where
    T: Clone + Into<Value>, 

fn from(f: &'a [T]) -> Value

Convert a slice to Value

Examples

use serde_json::Value;

let v: &[&str] = &["lorem", "ipsum", "dolor"];
let x: Value = v.into();

impl From<bool> for Value

fn from(f: bool) -> Value

Convert boolean to Value

Examples

use serde_json::Value;

let b = false;
let x: Value = b.into();

impl<T> From<Vec<T>> for Value where
    T: Into<Value>, 

fn from(f: Vec<T>) -> Value

Convert a Vec to Value

Examples

use serde_json::Value;

let v = vec!["lorem", "ipsum", "dolor"];
let x: Value = v.into();

impl From<i8> for Value

fn from(n: i8) -> Value

Performs the conversion.

impl From<isize> for Value

fn from(n: isize) -> Value

Performs the conversion.

impl From<u8> for Value

fn from(n: u8) -> Value

Performs the conversion.

impl From<u64> for Value

fn from(n: u64) -> Value

Performs the conversion.

impl From<i64> for Value

fn from(n: i64) -> Value

Performs the conversion.

impl From<i32> for Value

fn from(n: i32) -> Value

Performs the conversion.

impl From<usize> for Value

fn from(n: usize) -> Value

Performs the conversion.

impl From<i16> for Value

fn from(n: i16) -> Value

Performs the conversion.

impl<'a> From<Cow<'a, str>> for Value

fn from(f: Cow<'a, str>) -> Value

Convert copy-on-write string to Value

Examples

use serde_json::Value;
use std::borrow::Cow;

let s: Cow<str> = Cow::Borrowed("lorem");
let x: Value = s.into();

use serde_json::Value;
use std::borrow::Cow;

let s: Cow<str> = Cow::Owned("lorem".to_string());
let x: Value = s.into();

impl<I> IndexMut<I> for Value where
    I: Index, 

fn index_mut(&mut self, index: I) -> &mut Value

Write into a serde_json::Value using the syntax value[0] = ... or value["k"] = ....

If the index is a number, the value must be an array of length bigger than the index. Indexing into a value that is not an array or an array that is too small will panic.

If the index is a string, the value must be an object or null which is treated like an empty object. If the key is not already present in the object, it will be inserted with a value of null. Indexing into a value that is neither an object nor null will panic.

Examples

let mut data = json!({ "x": 0 });

// replace an existing key
data["x"] = json!(1);

// insert a new key
data["y"] = json!([false, false, false]);

// replace an array value
data["y"][0] = json!(true);

// inserted a deeply nested key
data["a"]["b"]["c"]["d"] = json!(true);

println!("{}", data);

impl Deserializer for Value

type Error = Error

fn deserialize<V>(self, visitor: V) -> Result<<V as Visitor>::Value, Error> where
    V: Visitor, 

fn deserialize_option<V>(
    self,
    visitor: V
) -> Result<<V as Visitor>::Value, Error> where
    V: Visitor, 

fn deserialize_enum<V>(
    self,
    _name: &str,
    _variants: &'static [&'static str],
    visitor: V
) -> Result<<V as Visitor>::Value, Error> where
    V: Visitor, 

fn deserialize_newtype_struct<V>(
    self,
    _name: &'static str,
    visitor: V
) -> Result<<V as Visitor>::Value, <Value as Deserializer>::Error> where
    V: Visitor, 

fn deserialize_bool<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_u8<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_u16<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_u32<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_u64<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_i8<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_i16<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_i32<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_i64<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_f32<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_f64<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_char<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_str<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_string<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_unit<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_seq<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_seq_fixed_size<__V>(
    self,
    usize,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_bytes<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_byte_buf<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_map<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_unit_struct<__V>(
    self,
    &'static str,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_tuple_struct<__V>(
    self,
    &'static str,
    usize,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_struct<__V>(
    self,
    &'static str,
    &'static [&'static str],
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_struct_field<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_tuple<__V>(
    self,
    usize,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_ignored_any<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <Value as Deserializer>::Error> where
    __V: Visitor, 

impl<'a> Deserializer for &'a Value

type Error = Error

fn deserialize<V>(self, visitor: V) -> Result<<V as Visitor>::Value, Error> where
    V: Visitor, 

fn deserialize_option<V>(
    self,
    visitor: V
) -> Result<<V as Visitor>::Value, Error> where
    V: Visitor, 

fn deserialize_enum<V>(
    self,
    _name: &str,
    _variants: &'static [&'static str],
    visitor: V
) -> Result<<V as Visitor>::Value, Error> where
    V: Visitor, 

fn deserialize_newtype_struct<V>(
    self,
    _name: &'static str,
    visitor: V
) -> Result<<V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    V: Visitor, 

fn deserialize_bool<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_u8<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_u16<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_u32<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_u64<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_i8<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_i16<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_i32<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_i64<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_f32<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_f64<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_char<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_str<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_string<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_unit<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_seq<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_seq_fixed_size<__V>(
    self,
    usize,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_bytes<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_byte_buf<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_map<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_unit_struct<__V>(
    self,
    &'static str,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_tuple_struct<__V>(
    self,
    &'static str,
    usize,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_struct<__V>(
    self,
    &'static str,
    &'static [&'static str],
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_struct_field<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_tuple<__V>(
    self,
    usize,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

fn deserialize_ignored_any<__V>(
    self,
    visitor: __V
) -> Result<<__V as Visitor>::Value, <&'a Value as Deserializer>::Error> where
    __V: Visitor, 

impl Default for Value

The default value is Value::Null.

This is useful for handling omitted Value fields when deserializing.

Examples

use serde_json::Value;

#[derive(Deserialize)]
struct Settings {
    level: i32,
    #[serde(default)]
    extras: Value,
}

let data = r#" { "level": 42 } "#;
let s: Settings = serde_json::from_str(data)?;

assert_eq!(s.level, 42);
assert_eq!(s.extras, Value::Null);

fn default() -> Value

impl Deserialize for Value

fn deserialize<D>(deserializer: D) -> Result<Value, <D as Deserializer>::Error> where
    D: Deserializer, 

Deserialize this value from the given Serde deserializer.