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feat: add zod example
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‎zod/.eslintrc.js

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/** @type {import('eslint').Linter.Config} */
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module.exports = {
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extends: ["@remix-run/eslint-config", "@remix-run/eslint-config/node"],
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};

‎zod/.gitignore

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node_modules
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/.cache
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/build
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/public/build
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.env

‎zod/README.md

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# Zod Example
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This example demonstrates how to use [Zod](https://npm.im/zod) for server-side validation and data transformation in a Remix application. It includes a user registration form and a product listing page.
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In the user registration form, Zod is used to validate and transform POST data which is submitted by the form in the action handler.
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In the product listing page, Zod is used to validate and transform GET query parameters which are used for filtering and pagination in the loader.
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Every validation and data transformation is done on the server-side, so the client can use the app without JavaScript enabled.
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Enjoy Remix's progressively enhanced forms 💿 and Zod's type safety 💎!
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## Preview
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Open this example on [CodeSandbox](https://codesandbox.com):
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[![Open in CodeSandbox](https://codesandbox.io/static/img/play-codesandbox.svg)](https://codesandbox.io/s/github/remix-run/examples/tree/main/zod)
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## Example
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### `app/root.tsx`
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A simple error boundary component is added to catch the errors and display error messages.
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### `app/routes/index.tsx`
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This file contains the user registration form and its submission handling logic. It leverages Zod for validating and transforming the POST data.
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### `app/routes/products.tsx`
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This file implements the product listing page, including filters and pagination. It leverages Zod for URL query parameter validation and transforming. A cache control header is added to the response to ensure the page is cached also.
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---
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Following two files are used for mocking and functionality demonstration. They are not directly related to Zod or Remix.
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#### `app/lib/product.server.ts`
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This file defines the schema for the product data and provides a mock product list. It's used to ensure the type safety of the product data.
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#### `app/lib/utils.server.ts`
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This file contains `isDateFormat` utility which is used for date validation for `<input type="date" />` and a function for calculating days until the next birthday.
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## Related Links
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- [Remix Documentation](https://remix.run/docs)
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- [Zod Documentation](https://github.com/colinhacks/zod/#zod)
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- [Zod: Coercion for Primitives](https://github.com/colinhacks/zod/#coercion-for-primitives)

‎zod/app/lib/product.server.ts

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import * as z from "zod";
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const ProductSchema = z.object({
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id: z.number().int().positive(),
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name: z.string(),
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price: z.number(),
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});
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type Product = z.infer<typeof ProductSchema>;
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export const mockProducts: Product[] = [
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{
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id: 1,
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name: "Laptop",
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price: 900,
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},
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{
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id: 2,
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name: "Smartphone",
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price: 700,
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},
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{
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id: 3,
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name: "T-shirt",
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price: 20,
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},
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{
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id: 4,
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name: "Jeans",
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price: 50,
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},
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{
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id: 5,
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name: "Running Shoes",
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price: 90,
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},
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{
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id: 6,
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name: "Bluetooth Speaker",
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price: 50,
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},
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{
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id: 7,
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name: "Dress Shirt",
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price: 30,
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},
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{
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id: 8,
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name: "Gaming Console",
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price: 350,
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},
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{
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id: 9,
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name: "Sneakers",
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price: 120,
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},
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{
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id: 10,
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name: "Watch",
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price: 200,
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},
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{
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id: 11,
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name: "Hoodie",
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price: 40,
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},
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{
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id: 12,
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name: "Guitar",
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price: 300,
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},
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{
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id: 13,
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name: "Fitness Tracker",
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price: 80,
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},
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{
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id: 14,
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name: "Backpack",
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price: 50,
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},
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{
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id: 15,
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name: "Dumbbell Set",
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price: 130,
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},
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];

‎zod/app/lib/utils.server.ts

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export const isDateFormat = (date: string): boolean => {
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return /^\d{4}-\d{2}-\d{2}$/.test(date);
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};
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export const calculateDaysUntilNextBirthday = (birthday: Date): number => {
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const today = new Date();
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const currentYear = today.getFullYear();
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const birthdayThisYear = new Date(
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currentYear,
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birthday.getMonth(),
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birthday.getDate(),
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);
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const diff = birthdayThisYear.getTime() - today.getTime();
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const days = Math.ceil(diff / (1000 * 3600 * 24));
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return days < 0 ? 365 + days : days;
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};

‎zod/app/root.tsx

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import type { MetaFunction } from "@remix-run/node";
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import {
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Links,
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LiveReload,
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Meta,
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Outlet,
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Scripts,
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ScrollRestoration,
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} from "@remix-run/react";
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export const meta: MetaFunction = () => ({
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charset: "utf-8",
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title: "Remix 💿 + Zod 💎",
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viewport: "width=device-width,initial-scale=1",
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});
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export default function App() {
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return (
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<html lang="en">
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<head>
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<Meta />
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<Links />
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</head>
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<body>
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<Outlet />
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<ScrollRestoration />
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<Scripts />
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<LiveReload />
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</body>
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</html>
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);
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}
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export const ErrorBoundary = ({ error }: { error: Error }) => {
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return (
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<div>
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<h1>App Error</h1>
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<pre>{error.message}</pre>
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</div>
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);
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};

‎zod/app/routes/index.tsx

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import { ActionArgs, json } from "@remix-run/node";
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import { Form, Link, useActionData, useNavigation } from "@remix-run/react";
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import * as z from "zod";
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import {
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calculateDaysUntilNextBirthday,
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isDateFormat,
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} from "~/lib/utils.server";
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export const action = async ({ request }: ActionArgs) => {
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const formData = await request.formData();
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const payload = Object.fromEntries(formData.entries());
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const currentDate = new Date();
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const schema = z.object({
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firstName: z
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.string()
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.min(2, "Must be at least 2 characters")
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.max(50, "Must be less than 50 characters"),
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email: z.string().email("Must be a valid email"),
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birthday: z.coerce
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.date()
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.min(
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new Date(
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currentDate.getFullYear() - 26,
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currentDate.getMonth(),
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currentDate.getDate(),
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),
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"Must be at younger than 25",
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)
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.max(
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new Date(
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currentDate.getFullYear() - 18,
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currentDate.getMonth(),
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currentDate.getDate(),
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),
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"Must be at least 18 years old",
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),
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});
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const parseResult = schema.safeParse(payload);
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if (!parseResult.success) {
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const fields = {
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firstName: typeof payload.firstName === "string" ? payload.firstName : "",
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email: typeof payload.email === "string" ? payload.email : "",
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birthday:
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typeof payload.birthday === "string" && isDateFormat(payload.birthday)
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? payload.birthday
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: "",
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};
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return json(
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{
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fieldErrors: parseResult.error.flatten().fieldErrors,
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fields,
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message: null,
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},
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{
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status: 400,
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},
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);
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}
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return json({
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fieldErrors: null,
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fields: null,
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message: `Hello ${parseResult.data.firstName}! We will send an email to ${
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parseResult.data.email
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} for your discount code in ${calculateDaysUntilNextBirthday(
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parseResult.data.birthday,
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)} days.`,
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});
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};
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const errorTextStyle: React.CSSProperties = {
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fontWeight: "bold",
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color: "red",
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marginInline: 0,
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marginBlock: "0.25rem",
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};
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export default function RegisterView() {
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const actionData = useActionData<typeof action>();
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const navigation = useNavigation();
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const isSubmitting = navigation.state === "submitting";
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if (actionData?.message) {
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return (
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<div>
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<h3>{actionData.message}</h3>
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<hr />
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<Link to="/products">View Products</Link>
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</div>
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);
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}
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return (
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<div>
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<h1>Register for a birthday discount!</h1>
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<Form method="post">
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<div>
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<label htmlFor="firstName">First Name:</label>
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<input
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type="text"
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id="firstName"
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name="firstName"
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defaultValue={actionData?.fields?.firstName}
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/>
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{actionData?.fieldErrors?.firstName
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? actionData.fieldErrors.firstName.map((error, index) => (
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<p style={errorTextStyle} key={`first-name-error-${index}`}>
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{error}
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</p>
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))
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: null}
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</div>
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<br />
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<div>
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<label htmlFor="email">Email:</label>
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<input
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type="email"
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id="email"
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name="email"
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defaultValue={actionData?.fields?.email}
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/>
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{actionData?.fieldErrors?.email
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? actionData.fieldErrors.email.map((error, index) => (
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<p style={errorTextStyle} key={`email-error-${index}`}>
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{error}
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</p>
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))
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: null}
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</div>
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<br />
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<div>
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<label htmlFor="birthday">Birthday:</label>
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<input
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type="date"
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id="birthday"
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name="birthday"
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defaultValue={actionData?.fields?.birthday}
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/>
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{actionData?.fieldErrors?.birthday
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? actionData.fieldErrors.birthday.map((error, index) => (
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<p style={errorTextStyle} key={`birthday-error-${index}`}>
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{error}
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</p>
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))
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: null}
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</div>
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<br />
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<button type="submit" disabled={isSubmitting}>
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Register
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</button>
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</Form>
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<hr />
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<Link to="/products" prefetch="intent">
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View Products
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</Link>
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</div>
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);
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}

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