Function serde_json::to_value [−][src]
pub fn to_value<T>(value: T) -> Result<Value, Error> where
T: Serialize,
Expand description
Convert a T
into serde_json::Value
which is an enum that can represent
any valid JSON data.
Example
use serde::Serialize; use serde_json::json; use std::error::Error; #[derive(Serialize)] struct User { fingerprint: String, location: String, } fn compare_json_values() -> Result<(), Box<Error>> { let u = User { fingerprint: "0xF9BA143B95FF6D82".to_owned(), location: "Menlo Park, CA".to_owned(), }; // The type of `expected` is `serde_json::Value` let expected = json!({ "fingerprint": "0xF9BA143B95FF6D82", "location": "Menlo Park, CA", }); let v = serde_json::to_value(u).unwrap(); assert_eq!(v, expected); Ok(()) }
Errors
This conversion can fail if T
’s implementation of Serialize
decides to
fail, or if T
contains a map with non-string keys.
use std::collections::BTreeMap; fn main() { // The keys in this map are vectors, not strings. let mut map = BTreeMap::new(); map.insert(vec![32, 64], "x86"); println!("{}", serde_json::to_value(map).unwrap_err()); }