#serde #path #error #deserialization #to


Path to the element that failed to deserialize

2 releases

✓ Uses Rust 2018 edition

0.1.1 Jan 7, 2019
0.1.0 Jan 7, 2019
Download history 8/week @ 2019-01-07

2 downloads per month


1.5K SLoC

Serde path to error

Build Status Latest Version Rust Documentation

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.

serde = "1.0"
serde_path_to_error = "0.1"
use serde::Deserialize;
use std::collections::BTreeMap as Map;

struct Package {
    name: String,
    dependencies: Map<String, Dependency>,

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");


Licensed under either of Apache License, Version 2.0 or MIT license at your option.
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.