Skip to main content

Compiler and API

Server-side component API

Edit this page on GitHub
const result = Component.render(...)

Unlike client-side components, server-side components don't have a lifespan after you render them — their whole job is to create some HTML and CSS. For that reason, the API is somewhat different.

A server-side component exposes a render method that can be called with optional props. It returns an object with head, html, and css properties, where head contains the contents of any <svelte:head> elements encountered.

You can import a Svelte component directly into Node using svelte/register.

const App = require('./App.svelte').default;
const { head, html, css } = App.render({
answer: 42

The .render() method accepts the following parameters:

parameter default description
props {} An object of properties to supply to the component
options {} An object of options

The options object takes in the following options:

option default description
context new Map() A Map of root-level context key-value pairs to supply to the component
const { head, html, css } = App.render(
// props
{ answer: 42 },
// options
context: new Map([['context-key', 'context-value']])