File-based routing

Front-Commerce uses Remix. Remix uses API Routes to handle all the routing of you application, and display the correct page when a user navigates to a URL. All routes are located under app/routes folder. API Routes will use the default export of each Route file to generate the route's UI. Go ahead and create a new route hello-world.tsx, that will display content when users browse http://localhost:4000/hello-world:

app/routes/hello-world.tsx
export default function HelloWorld() {
  return (
    <div>
      <h1>Hello world!</h1>
    </div>
  );
}

Loaders

In order to display dynamic content in your routes, you will need to fetch some data. This is done by using Remix's Routes API method loader.

Here is a basic example of how a loader could be used:

app/routes/hello-world.tsx
import type { LoaderFunction } from "@remix-run/node";
import { useLoaderData } from "@remix-run/react";

export const loader: LoaderFunction = () => {
  // This method will be called prior to rendering your client-side route, it's generally used to fetch the data for your component(s)
  return { name: "Jack Doe" };
};

export default function HelloWorld() {
  const { name } = useLoaderData();

  return (
    <div>
      <h1>Hello {name}!</h1>
    </div>
  );
}

And many more features

Routes play a fundamental part in a Remix (and Front-Commerce) application. It is the glue between the URL requested by a user and the response your application will send. We will continue to learn how to use them for the most common actions in the next sections, but here is a preview of everything a route could do:

app/routes/hello-world.tsx
import {
  json,
  type ActionFunction,
  type HeadersFunction,
  type LinksFunction,
  type LoaderFunction,
  type MetaFunction,
} from "@remix-run/node";
import { useLoaderData, Form, useRouteError } from "@remix-run/react";

export const headers: HeadersFunction = ({
  actionHeaders,
  loaderHeaders,
  parentHeaders,
  errorHeaders,
}) => ({
  "X-User-Id": loaderHeaders.get("X-User-Id"),
  "Cache-Control": "max-age=300, s-maxage=3600",
});

export const loader: LoaderFunction = async () => {
  // This method will be called prior to rendering your client-side route, it's generally used to fetch the data for your component(s)
  const user = await fetch("https://my-site.com/api/user").then((res) =>
    res.json()
  );

  return json({ name: user.name }, { headers: { "X-User-Id": user.id } });
};

export const links: LinksFunction = () => {
  return [
    {
      rel: "icon",
      href: "/favicon.png",
      type: "image/png",
    },
    {
      rel: "stylesheet",
      href: "https://my-site.com/styles.css",
    },
    {
      rel: "preload",
      href: "/images/banner.jpg",
      as: "image",
    },
  ];
};

export const action: ActionFunction = async ({ params, request }) => {
  const data = await request.formData();
  const email = data.get("email");

  await fetch("https://my-site.com/api/contact-list", {
    method: "POST",
    body: JSON.stringify({ email }),
  });

  return { success: true };
};

export const meta: MetaFunction = ({ data }) => {
  return [{ title: `Hello ${data.name}` }];
};

export default function HelloWorld() {
  const { name } = useLoaderData();

  return (
    <div>
      <h1>Hello {name}!</h1>
      <h2>Contact us:</h2>
      <Form method="post">
        <label htmlFor="email">Email</label>
        <input id="email" type="email" name="email" />
        <button type="submit">Submit</button>
      </Form>
    </div>
  );
}

export function ErrorBoundary() {
  const error = useRouteError();

  return (
    <div>
      Oops, something bad happened ! <pre>{error.toString()}</pre>
    </div>
  );
}

Loaders

And many more features

External resources