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# Serde path to error
[<img alt="github" src="https://img.shields.io/badge/github-dtolnay/path--to--error-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/path-to-error)
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Find out the path at which a deserialization error occurred. This crate provides
a wrapper that works with any existing Serde `Deserializer` and exposes the
chain of field names leading to the error.
```toml
[dependencies]
serde = "1.0"
serde_path_to_error = "0.1"
```
```rust
use serde::Deserialize;
use std::collections::BTreeMap as Map;
#[derive(Deserialize)]
struct Package {
name: String,
dependencies: Map<String, Dependency>,
}
#[derive(Deserialize)]
struct Dependency {
version: String,
}
fn main() {
let j = r#"{
"name": "demo",
"dependencies": {
"serde": {
"version": 1
}
}
}"#;
// Some Deserializer.
let jd = &mut serde_json::Deserializer::from_str(j);
let result: Result<Package, _> = serde_path_to_error::deserialize(jd);
match result {
Ok(_) => panic!("expected a type error"),
Err(err) => {
let path = err.path().to_string();
assert_eq!(path, "dependencies.serde.version");
}
}
}
```
<br>
#### License
<sup>
Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
</sup>
<br>
<sub>
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.
</sub>