leptos-use/docs/book/src/server_side_rendering.md

Server-Side Rendering

When using together with server-side rendering (SSR) you have to enable the feature ssr similar to how you do it for leptos.

In your Cargo.toml file add the following:

...

[features]
hydrate = [
    "leptos/hydrate", 
    ...
]
ssr = [
    ...
    "leptos/ssr",
    ...
    "leptos-use/ssr" # add this
]

...

Please see the ssr example in the examples folder for a simple working demonstration.

Many functions work differently on the server and on the client. If that's the case you will find information about these differences in their respective docs under the section "Server-Side Rendering". If you don't find that section, it means that the function works exactly the same on both, the client and the server.

Functions with Target Elements

A lot of functions like use_event_listener and use_element_size are only useful when a target HTML/SVG element is available. This is not the case on the server. You can simply wrap them in create_effect which will cause them to be only called in the browser.

create_effect(
    cx,
    move |_| {
        // window() doesn't work on the server
        use_event_listener(window(), "resize", move |_| {
            // ...
        })
    },
);