7 releases

new 0.0.7 Nov 22, 2020
0.0.6 Nov 22, 2020

#201 in Encoding

32 downloads per month
Used in serde-querystring-actix


1.5K SLoC


An alternative query string parser based on serde for rust.


# Cargo.toml
serde-querystring = "0.0.7"


// In your main function
let x: MyStruct = serde_querystring::from_str("YOUR QUERY STRING");

To see what is supported and what is not, please read the docs.

There is also serde-querystring-actix crate to support using this crate with actix-web. It provides QueryString extractor which works just like the actix-web's own web::Query but uses serde-querystring to deserialize.


Existing alternatives don't cover some cases, for example enums (having enums in sequences, usefull for filters in rest apis) is not a first class value in similar crates. This crate tries to cover more real world use cases and it uses a different strategy to parse the query string which gives it some freedom to decide how to parse depending on the resulting data structure. Note that it may not be fully compatible with some existing standards in some cases, but it tries to support the cases they defined.


This project is still in its early stage of development and things may change without notice, so use it at your own risk.


If you're looking for a more production ready alternative, consider looking at these crates:

serde_urlencoded: a performant query parser which doesn't support subkeys (aka dicts)

serde_qs a better alternative to this one which is more mature and is featureful enough for most cases

Known bugs

  • Doesn't have correct error reporting yet
  • Doesn't support unit types
  • Doesn't check if it visited all the input when visiting subkeys
  • Doesn't support deserializing into a sequence of key-values instead of map(More of a feature)

Tests only cover valid querystrings in some cases, so there can be some bugs here and there. If you face a bug, please open an issue and let me know.


It uses a good amount of code ported or copied from serde_json crate and some lines from form_urlencoded crate for example to parse numbers or strings.


This project is licensed under either of

at your option.