The ultimate search extension for Rust

Search docs, crates, builtin attributes, official books, and error codes, etc in your address bar instantly. Input keyword rs then press Space to get started. Just that easy!

Current version 1.1.0 Install to Chrome Install to Firefox Install to Edge
Explore More ⇩

Search std and external crate docs

We support search documentation of official crates (including std, proc_macro, test) and any external crates on

We'll sync the latest std search index automatically every day to ensure the docs freshness. There is no extension updating required to get the latest search index since v1.0.

Search Primitive Types and Modules


Search Structs, Traits and Enums


Search Functions, Methods and Macros


Search nightly docs

You can prefix / before the keyword to search nightly docs.

We'll sync the latest nightly search index automatically every day to ensure the docs freshness. There is no extension updating required to get the latest search index since v1.0.

Search with type mode

You can prefix a type to get the exclusive search result. Those type keywords including:

For example, fn:asref to search function or trait:iterator to search trait.


Offline mode, search local Rust docs

You can run command rustup doc --std to open the offline std docs. To enable the offline mode, you should check the checkbox and input the offline docs path on the popup page. However, please check the Caveats if you are a Firefox user.


Search external crate docs

After you add the crate to extension, you can prefix @crate-name to search the docs exclusive to that crate. For example, input @tokio spawn to search docs of tokio.


~ is another pretty prefix to search the external crate docs. Unlike the @ prefix, ~ gives you the power to search docs across all your favorite crates effortlessly.

For example, input ~spawn, you can get results related to "spawn" from all your favorite crates (e.g. tokio, async_std, smol, and futures ).


Search builtin attributes

Search builtin attributes (such as derive, non_exhaustive) are also supported, by default, the result is mixed with other related docs or crates though.

If you prefer to search attribute exclusively, prefix a # (pound sign) before the keyword to narrow the result.


Search top 20K crates

We build top 20K crates index (near 50K in total on once a day to help you search crates instantly. You can prefix an ! (exclamation mark) before the keyword to search exclusively, prefix one more ! (double exclamation mark) to open page, prefix !!! (triple exclamation mark) to open crate's repository (See Open repository quickly).


Search compiler error code


Search Rust official book chapters

You can search all of Rust book chapters too! The result will show the title of the related page, parent chapter, and grandparent chapter. Don't forget the % is the prefix to perform the book searching.


Search Cargo Clippy lints

> (right angle bracket) is also a great prefix to help you search Cargo Clippy lints exclusively.


Search and RFC

You can search and RFC with ? and ?? prefix respectively.


Commands system

The command system brings a handy set of useful and convenient commands to you. Each command starts with a : (colon), followed by the name, and function differently in individual. Those commands including but not limited to:


Rust docs enhancement

Make all "since" and "issue" linkable

Two kinds of tags links to corresponding urls, including: enhancement

Display Feature Flags don't display the crate's feature flags, which is inconvenient. So Rust Search Extension fills the gap.


Add your favorite crate to extension

By clicking the + to Rust Search Extension button, you can add the crate to the extension, which brings the search capability for this crate on the address bar.

Rust repository enhancement

Show table of content in the release page

Searching statistics

Searching statistics page provides a set of useful charts to visualize your search history. This gives you a powerful insight view on how frequency you search, how much valuable time you saved.

These charts including:



Customize crates searching platform

You can customize your preferred crates searching platform such as or on the popup page.

Open repository quickly

You can prefix !!! (triple !) to open crate's repository quickly. For example, input !!!tokio then enter, the extension will obtain the repository url then redirect to the github repository page of tokio effortlessly.

Page down/up easily

You can press space after the keyword, then increase or decrease the number of - (hyphen) to page down or page up.