Remix Utils

This package contains simple utility functions to use with Remix.run.

Installation

npm install remix-utils remix @remix-run/node @remix-run/react react

API Reference

ClientOnly

The ClientOnly component lets you render the children element only on the client-side, avoiding rendering it the server-side.

You can, optionally, provide a fallback component to be used on SSR.

import { ClientOnly } from "remix-utils";

export default function View() {
  return (
    <ClientOnly fallback={<SimplerStaticVersion />}>
      <ComplexComponentNeedingBrowserEnvironment />
    </ClientOnly>
  );
}

This component is handy when you have some complex component that needs a browser environment to work, like a chart or a map. This way, you can avoid rendering it server-side and instead use a simpler static version like an SVG or even a loading UI.

The rendering flow will be:

SSR: Always render the fallback.
CSR First Render: Always render the fallback.
CSR Update: Update to render the actual component.
CSR Future Renders: Always render the actual component, don't bother to render the fallback.

This component uses the useHydrated hook internally.

CSRF

The CSRF related functions let you implement CSRF protection on your application.

This part of Remix Utils needs React and server-side code.

Generate the authenticity token

In the server, we need to add to our root component the following.

import type { LoaderFunction } from "remix";
import { createAuthenticityToken, json } from "remix-utils";
import { getSession, commitSession } from "~/services/session.server";

interface LoaderData {
  csrf: string;
}

export let loader: LoaderFunction = async ({ request }) => {
  let session = await getSession(request.headers.get("cookie"));
  let token = createAuthenticityToken(session);
  return json<LoaderData>(
    { csrf: token },
    { headers: { "Set-Cookie": await commitSession(session) } }
  );
};

The createAuthenticityToken function receives a session object and stores the authenticity token there using the csrf key (you can pass the key name as a second argument). Finally, you need to return the token in a json response and commit the session.

Render the AuthenticityTokenProvider

You need to read the authenticity token and render the AuthenticityTokenProvider component wrapping your code in your root.

import { Outlet, useLoaderData } from "remix";
import { Document } from "~/components/document";

export default function Root() {
  let { csrf } = useLoaderData<LoaderData>();
  return (
    <AuthenticityTokenProvider token={csrf}>
      <Document>
        <Outlet />
      </Document>
    </AuthenticityTokenProvider>
  );
}

With this, your whole app can access the authenticity token generated in the root.

Rendering a Form

When you create a form in some route, you can use the AuthenticityTokenInput component to add the authenticity token to the form.

import { Form } from "remix";
import { AuthenticityTokenInput } from "remix-utils";

export default function SomeRoute() {
  return (
    <Form method="post">
      <AuthenticityTokenInput />
      <input type="text" name="something" />
    </Form>
  );
}

Note that the authenticity token is only really needed for a form that mutates the data somehow. If you have a search form making a GET request, you don't need to add the authenticity token there.

This AuthenticityTokenInput will get the authenticity token from the AuthenticityTokenProvider component and add it to the form as the value of a hidden input with the name csrf. You can customize the field name using the name prop.

<AuthenticityTokenInput name="customName" />

You should only customize the name if you also changed it on createAuthenticityToken.

Alternative: Using `useAuthenticityToken` and `useFetcher`.

If you need to use useFetcher (or useSubmit) instead of Form you can also get the authenticity token with the useAuthenticityToken hook.

import { useFetcher } from "remix";
import { useAuthenticityToken } from "remix-utils";

export function useMarkAsRead() {
  let fetcher = useFetcher();
  let csrf = useAuthenticityToken();
  return function submit(data) {
    fetcher.submit({ csrf, ...data }, { action: "/action", method: "post" });
  };
}

Verify in the Action

Finally, you need to verify the authenticity token in the action that received the request.

import type { ActionFunction } from "remix";
import { verifyAuthenticityToken, redirectBack } from "remix-utils";
import { getSession, commitSession } from "~/services/session.server";

export let action: ActionFunction = async ({ request }) => {
  let session = await getSession(request.headers.get("Cookie"));
  await verifyAuthenticityToken(request, session);
  // do something here
  return redirectBack(request, { fallback: "/fallback" });
};

Suppose the authenticity token is missing on the session, the request body, or doesn't match. In that case, the function will throw an Unprocessable Entity response that you can either catch and handle manually or let pass and render your CatchBoundary.

DynamicLinks

If you need to create <link /> tags based on the loader data instead of being static, you can use the DynamicLinks component together with the DynamicLinksFunction type.

In the route you want to define dynamic links add handle export with a dynamicLinks method, this method should implement the DynamicLinksFunction type.

let dynamicLinks: DynamicLinksFunction<LoaderData> = async ({ data }) => {
  if (!data.user) return [];
  return [{ rel: "preload", href: data.user.avatar, as: "image" }];
};

Then, in the root route, add the DynamicLinks component before the Remix's Links component, usually inside a Document component.

import { Links, LiveReload, Meta, Scripts, ScrollRestoration } from "remix";
import { DynamicLinks } from "remix-utils";

type Props = { children: React.ReactNode; title?: string };

export function Document({ children, title }: Props) {
  return (
    <html lang="en">
      <head>
        <meta charSet="utf-8" />
        <meta name="viewport" content="width=device-width,initial-scale=1" />
        {title ? <title>{title}</title> : null}
        <Meta />
        <DynamicLinks />
        <Links />
      </head>
      <body>
        {children}
        <ScrollRestoration />
        <Scripts />
        {process.env.NODE_ENV === "development" && <LiveReload />}
      </body>
    </html>
  );
}

Now, any link you defined in the DynamicLinksFunction will be added to the HTML as any static link in your LinksFunctions.

Note: You can also put the DynamicLinks after the Links component, it's up to you what to prioritize, since static links are probably prefetched when you do <Link prefetch> you may want to put the DynamicLinks first to prioritize them.

ExternalScripts

If you need to load different external scripts on certain routes, you can use the ExternalScripts component together with the ExternalScriptsFunction type.

In the route you want to load the script add a handle export with a scripts method, this method should implement the ExternalScriptsFunction type.

// create the scripts function with the correct type
let scripts: ExternalScriptsFunction = () => {
  return [
    {
      src: "https://code.jquery.com/jquery-3.6.0.min.js",
      integrity: "sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=",
      crossOrigin: "anonymous",
    },
  ];
};

// and export it through the handle, you could also create it inline here
// if you don't care about the type
export let handle = { scripts };

Then, in the root route, add the ExternalScripts component together with the Remix's Scripts component, usually inside a Document component.

import { Links, LiveReload, Meta, Scripts, ScrollRestoration } from "remix";
import { ExternalScripts } from "remix-utils";

type Props = { children: React.ReactNode; title?: string };

export function Document({ children, title }: Props) {
  return (
    <html lang="en">
      <head>
        <meta charSet="utf-8" />
        <meta name="viewport" content="width=device-width,initial-scale=1" />
        {title ? <title>{title}</title> : null}
        <Meta />
        <Links />
      </head>
      <body>
        {children}
        <ScrollRestoration />
        <ExternalScripts />
        <Scripts />
        {process.env.NODE_ENV === "development" && <LiveReload />}
      </body>
    </html>
  );
}

Now, any script you defined in the ScriptsFunction will be added to the HTML together with a <link rel="preload"> before it.

Tip: You could use it together with useShouldHydrate to disable Remix scripts in certain routes but still load scripts for analytics or small features that need JS but don't need the full app JS to be enabled.

Outlet & useParentData

This feature is now built-in into Remix as Outlet & useOutletContext so it's marked as deprecated here. The feature will be removed in v3 of Remix Utils.

This wrapper of the Remix Outlet component lets you pass an optional data prop, then using the useParentData hook, you can access that data.

Helpful to pass information from parent to child routes, for example, the authenticated user data.

// parent route
import { Outlet } from "remix-utils";

export default function Parent() {
  return <Outlet data={{ something: "here" }} />;
}

// child route
import { useParentData } from "remix-utils";

export default function Child() {
  const data = useParentData();
  return <div>{data.something}</div>;
}

RevalidateLink

The RevalidateLink link component is a simple wrapper of Remix's Link component. It receives the same props with the exception of the to prop; instead, this component will render a Link to ..

By linking to ., when clicked, this will tell Remix to fetch again the loaders of the current routes, but instead of creating a new entry on the browser's history stack, it will replace the current one. Basically, it will refresh the page, but only reloading the data.

If you don't have JS enabled, this will do a full page refresh instead, giving you the exact same behavior.

<RevalidateLink className="refresh-btn-styles">Refresh</RevalidateLink>

useHydrated

This hook lets you detect if your component is already hydrated. This means the JS for the element loaded client-side and React is running.

With useHydrated, you can render different things on the server and client while ensuring the hydration will not have a mismatched HTML.

import { useHydrated } from "remix-utils";

export function Component() {
  let isHydrated = useHydrated();

  if (isHydrated) {
    return <ClientOnlyComponent />;
  }

  return <ServerFallback />;
}

When doing SSR, the value of isHydrated will always be false. The first client-side render isHydrated will still be false, and then it will change to true.

After the first client-side render, future components rendered calling this hook will receive true as the value of isHydrated. This way, your server fallback UI will never be rendered on a route transition.

useRevalidate

This hook lets you trigger a revalidation of the loaders in the current routes.

The way this works is by navigating to . and adding replace: true to avoid creating a new entry on the history stack.

Check #RevalidateLink for more information and a component version of this feature that works without JS.

This Hook is mostly useful if you want to trigger the revalidation manually from an effect, examples of this are:

Set an interval to trigger the revalidation
Revalidate when the browser tab is focused again
Revalidate when the user is online again

import { useRevalidate } from "remix-utils";

function useRevalidateOnInterval() {
  let revalidate = useRevalidate();
  useEffect(() => {
    let interval = setInterval(revalidate, 5000);
    return () => clearInterval(interval);
  }, [revalidate]);
}

useRouteData

This hook lets you access the data of any route in the current page. This can include child or parent routes.

To use it, call useRouteData in your component and pass the route path as a string. As an example, if you had the following routes:

routes/articles/$slug.tsx
routes/articles/index.tsx
routes/articles.tsx

Then you need to pass useRouteData("/articles") to get the data of routes/articles.tsx and useRouteData("/articles/") to get the data of routes/articles/index.tsx.

let parentData = useRouteData("/articles");
let indexData = useRouteData("/articles/");

If the pathname is dynamic as with the routes/articles/$slug.tsx route, you can attach and ID to the route using the handle export, and then use that ID in the useRouteData hook.

// inside routes/articles/$slug.tsx
export let handle = { id: "article-show" }; // the ID can be anything

// inside any other route
import { useRouteData } from "remix-utils";

export default function Screen() {
  let data = useRouteData("article-show");
  // use data here
}

The useRouteData hook receives a generic to be used as the type of the route data. Because the route may not be found the return type is Data | undefined. This means if you do the following:

let data = useRouteData<ArticleShowData>("article-show");

The type of data will be ArticleShowData | undefined, so you will need to check if it's not undefined before being able to use it.

useShouldHydrate

If you are building a Remix application where most routes are static, and you want to avoid loading client-side JS, you can use this hook, plus some conventions, to detect if one or more active routes needs JS and only render the Scripts component in that case.

In your document component, you can call this hook to dynamically render the Scripts component if needed.

import type { ReactNode } from "react";
import { Links, LiveReload, Meta, Scripts } from "remix";
import { useShouldHydrate } from "remix-utils";

interface DocumentProps {
  children: ReactNode;
  title?: string;
}

export function Document({ children, title }: DocumentProps) {
  let shouldHydrate = useShouldHydrate();
  return (
    <html lang="en">
      <head>
        <meta charSet="utf-8" />
        <link rel="icon" href="/favicon.png" type="image/png" />
        {title ? <title>{title}</title> : null}
        <Meta />
        <Links />
      </head>
      <body>
        {children}
        {shouldHydrate && <Scripts />}
        {process.env.NODE_ENV === "development" && <LiveReload />}
      </body>
    </html>
  );
}

Now, you can export a handle object with the hydrate property as true in any route module.

export let handle = { hydrate: true };

This will mark the route as requiring JS hydration.

In some cases, a route may need JS based on the data the loader returned. For example, if you have a component to purchase a product, but only authenticated users can see it, you don't need JS until the user is authenticated. In that case, you can make hydrate be a function receiving your loader data.

export let handle = {
  hydrate(data: LoaderData) {
    return data.user.isAuthenticated;
  },
};

The useShouldHydrate hook will detect hydrate as a function and call it using the route data.

Body Parser

These utilities let you parse the request body with a simple function call. You can parse it to a string, a URLSearchParams instance, or an object.

toString

This function receives the whole request and returns a promise with the body as a string.

import { bodyParser, redirectBack } from "remix-utils";
import type { ActionFunction } from "remix";

import { updateUser } from "../services/users";

export let action: ActionFunction = async ({ request }) => {
  let body = await bodyParser.toString(request);
  body = new URLSearchParams(body);
  await updateUser(params.id, { username: body.get("username") });
  return redirectBack(request, { fallback: "/" });
};

toSearchParams

A better version of this feature is supported out of the box by Remix. It's recommended to use await request.formData() instead.

This function receives the whole request and returns a promise with an instance of URLSearchParams, and the request's body is already parsed.

import { bodyParser, redirectBack } from "remix-utils";
import type { ActionFunction } from "remix";

import { updateUser } from "../services/users";

export let action: ActionFunction = async ({ request, params }) => {
  const body = await bodyParser.toSearchParams(request);
  await updateUser(params.id, { username: body.get("username") });
  return redirectBack(request, { fallback: "/" });
};

This is the same as doing:

let body = await bodyParser.toString(request);
return new URLSearchParams(body);

toJSON

This function receives the whole request and returns a promise with an unknown value. That value is going to be the body of the request.

The result is typed as unknown to force you to validate the object to ensure it's what you expect. This is because there's no way for TypeScript to know what the type of the body is since it's an entirely dynamic value.

import { bodyParser, redirectBack } from "remix-utils";
import type { ActionFunction } from "remix";
import { hasUsername } from "../validations/users";
import { updateUser } from "~/services/users";

export let action: ActionFunction = async ({ request }) => {
  const body = await bodyParser.toJSON(request);
  hasUsername(body); // this should throw if body doesn't have username
  // from this point you can do `body.username`
  await updateUser(params.id, { username: body.username });
  return redirectBack(request, { fallback: "/" });
};

This is the same as doing:

let body = await bodyParser.toSearchParams(request);
return Object.fromEntries(params.entries()) as unknown;

Responses

Typed JSON

This feature is now built-in into Remix so it's marked as deprecated here. The feature will be removed in v3 of Remix Utils.

This function is a typed version of the json helper provided by Remix. It accepts a generic with the type of data you are going to send in the response.

This helps ensure that the data you are sending from your loader matches the provided type at the compiler lever. It's more useful when you create an interface or type for your loader so you can share it between json and useLoaderData to help you avoid missing or extra parameters in the response.

Again, this is not doing any kind of validation on the data you send. It's just a type checker.

The generic extends JsonValue from type-fest, this limit the type of data you can send to anything that can be serializable, so you are not going to be able to send BigInt, functions, Symbols, etc. If JSON.stringify fails to try to stringify that value, it will not be supported.

import { useLoaderData } from "remix";
import type { LoaderFunction } from "remix";
import { json } from "remix-utils";

import { getUser } from "../services/users";
import type { User } from "../types";

interface LoaderData {
  user: User;
}

export let loader: LoaderFunction = async ({ request }) => {
  const user = await getUser(request);
  return json<LoaderData>({ user });
};

export default function View() {
  const { user } = useLoaderData<LoaderData>();
  return <h1>Hello, {user.name}</h1>;
}

Redirect Back

This function is a wrapper of the redirect helper from Remix. Unlike Remix's version, this one receives the whole request object as the first value and an object with the response init and a fallback URL.

The response created with this function will have the Location header pointing to the Referer header from the request, or if not available, the fallback URL provided in the second argument.

import { redirectBack } from "remix-utils";
import type { ActionFunction } from "remix";

export let action: ActionFunction = async ({ request }) => {
  await redirectBack(request, { fallback: "/" });
};

This helper is most useful when used in a generic action to send the user to the same URL it was before.

Bad Request

Helper function to create a Bad Request (400) response with a JSON body.

import { badRequest } from "remix-utils";
import type { ActionFunction } from "remix";

export let action: ActionFunction = async () => {
  throw badRequest({ message: "You forgot something in the form." });
};

Unauthorized

Helper function to create an Unauthorized (401) response with a JSON body.

import { unauthorized } from "remix-utils";
import type { LoaderFunction } from "remix";

export let loader: LoaderFunction = async () => {
  // usually what you really want is to throw a redirect to the login page
  throw unauthorized({ message: "You need to login." });
};

Forbidden

Helper function to create a Forbidden (403) response with a JSON body.

import { forbidden } from "remix-utils";
import type { LoaderFunction } from "remix";

export let loader: LoaderFunction = async () => {
  throw forbidden({ message: "You don't have access for this." });
};

Not Found

Helper function to create a Not Found (404) response with a JSON body.

import { notFound } from "remix-utils";
import type { LoaderFunction } from "remix";

export let loader: LoaderFunction = async () => {
  throw notFound({ message: "This doesn't exists." });
};

Unprocessable Entity

Helper function to create an Unprocessable Entity (422) response with a JSON body.

import { unprocessableEntity } from "remix-utils";
import type { LoaderFunction } from "remix";

export let loader: LoaderFunction = async () => {
  throw unprocessableEntity({ message: "This doesn't exists." });
};

This is used by the CSRF validation. You probably don't want to use it directly.

Server Error

Helper function to create a Server Error (500) response with a JSON body.

import { serverError } from "remix-utils";
import type { LoaderFunction } from "remix";

export let loader: LoaderFunction = async () => {
  throw serverError({ message: "Something unexpected happened." });
};

Not Modified

Helper function to create a Not Modified (304) response without a body and any header.

export let loader: LoaderFunction = async ({ request }) => {
  return notModified();
};

JavaScript

Helper function to create a JavaScript file response with any header.

This is useful to create JS files based on data inside a Resource Route.

export let loader: LoaderFunction = async ({ request }) => {
  return javascript("console.log('Hello World')");
};

Stylesheet

Helper function to create a CSS file response with any header.

This is useful to create CSS files based on data inside a Resource Route.

export let loader: LoaderFunction = async ({ request }) => {
  return stylesheet("body { color: red; }");
};

PDF

Helper function to create a PDF file response with any header.

This is useful to create PDF files based on data inside a Resource Route.

export let loader: LoaderFunction = async ({ request }) => {
  return pdf(await generatePDF(request.formData()));
};

HTML

Helper function to create a HTML file response with any header.

This is useful to create HTML files based on data inside a Resource Route.

export let loader: LoaderFunction = async ({ request }) => {
  return html("<h1>Hello World</h1>");
};

Author

Sergio Xalambrí

License

MIT License

Name		Name	Last commit message	Last commit date
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.github		.github
config		config
examples		examples
src		src
test		test
.eslintrc.js		.eslintrc.js
.gitignore		.gitignore
.npmignore		.npmignore
LICENSE		LICENSE
README.md		README.md
package-lock.json		package-lock.json
package.json		package.json
tsconfig.json		tsconfig.json

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Remix Utils

Installation

API Reference

ClientOnly

CSRF

Generate the authenticity token

Render the AuthenticityTokenProvider

Rendering a Form

Alternative: Using useAuthenticityToken and useFetcher.

Verify in the Action

DynamicLinks

ExternalScripts

Outlet & useParentData

RevalidateLink

useHydrated

useRevalidate

useRouteData

useShouldHydrate

Body Parser

toString

toSearchParams

toJSON

Responses

Typed JSON

Redirect Back

Bad Request

Unauthorized

Forbidden

Not Found

Unprocessable Entity

Server Error

Not Modified

JavaScript

Stylesheet

PDF

HTML

Author

License

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Languages

Alternative: Using `useAuthenticityToken` and `useFetcher`.

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