remix-zod

remix-zod is an integration library for Remix applications that leverages the power of Zod for robust and elegant data validation. This library simplifies the process of validating and parsing data from requests in Remix actions and loaders, offering a declarative and type-safe way to ensure your application data integrity.

Features

• Type Safety: Leverage TypeScript to ensure the data structure of your requests at compile time.
• Declarative Validation: Use Zod schemas to declaratively validate request bodies, query parameters, headers, and more.
• Custom Error Handling: Easily customize error responses for failed validations to maintain consistency across your API.
• Flexible Parsing: Supports parsing and validation of JSON, form data, and multipart form data, including file uploads.
• Extended Zod Functionality: Additional utility functions and schema types specifically designed for common web patterns and Remix requirements.

Installation

npm install remix-zod zod

or

bun add remix-zod zod

Make sure you have remix and zod installed in your project as remix-zod is designed to work with them.

Usage

Basic Example

Below is a simple example of how to use remix-zod in a Remix action function with a Zod schema for validation:

import {z as zod} from "zod";
import {action} from "remix";
import {zodAction} from "remix-zod";

const MySchema = zod.object({
    name: zod.string().min(1, "Name is required"),
    age: zod.number().min(18, "Must be at least 18"),
});

export const action = zodAction({
    body: MySchema,
}, async ({parsedBody}) => {
    // parsedBody is already validated against MySchema
    console.log(parsedBody.name, parsedBody.age);
    // Perform your logic here
});

Advanced Usage

For more complex scenarios, including file uploads, custom error handling, and parsing cookies or headers, remix-zod provides a comprehensive set of utilities.

File Upload Validation

import {z as zod} from "zod";
import {zodAction, zx} from "remix-zod";

const FileSchema = zx.file({
    mimetype: "image/jpeg",
    maximumSize: {
        value: 5,
        unit: 'MB'
    }
});

export const action = zodAction({
    body: zod.object({
        avatar: FileSchema,
    }),
}, async ({parsedBody}) => {
    // Handle the validated file upload
});

Customizing Error Responses

remix-zod allows for customization of the error responses, enabling you to maintain a consistent API structure even in the face of validation errors.

import {customBadRequestJson} from "remix-zod";

// Customize the JSON response for bad requests
customBadRequestJson = (message) => ({
    error: true,
    message
});

Using remix-zod with Loaders

remix-zod seamlessly integrates with Remix loaders, enabling you to validate query parameters and URL parameters using Zod schemas. This ensures that your loader functions receive only valid data, simplifying logic and improving data integrity.

Loader Example

Here's how you can use remix-zod in a Remix loader function:

import {z as zod} from "zod";
import {loader} from "remix";
import {zodLoader} from "remix-zod";

const ParamsSchema = zod.object({
    userId: zod.string().uuid(),
});

const QuerySchema = zod.object({
    search: zod.string().optional(),
});

export const loader = zodLoader({
    params: ParamsSchema,
    query: QuerySchema,
}, async ({
              parsedParams,
              parsedQuery
          }) => {
    // Both parsedParams and parsedQuery are validated against their respective schemas
    console.log(parsedParams.userId, parsedQuery.search);
    // Perform your loader logic here
});

This example demonstrates how to validate both URL parameters and query parameters in a loader function, ensuring that the data you work with is exactly as expected.

Individual Parse Methods

remix-zod provides a variety of parsing methods to handle different parts of the HTTP request, including:

• JSON Body: parseJson, parseJsonSafe, parseJsonWithDefault
• Form Data: parseForm, parseFormSafe, parseFormWithDefault
• URL Parameters: parseParams, parseParamsSafe, parseParamsWithDefault
• Query Parameters: parseQuery, parseQuerySafe, parseQueryWithDefault
• Headers: parseHeaders, parseHeadersSafe, parseHeadersWithDefault

Using Parse Methods

Here's how to use these parse methods in your actions or loaders:

Parsing JSON Body

export const action = async ({request}) => {
    const parsedBody = await parseJson(request, MySchema);
    // Use parsedBody here
};

Parsing Form Data

export const action = async ({request}) => {
    const parsedBody = await parseForm(request, MySchema);
    // Use parsedBody here
};

Parsing URL and Query Parameters

In loaders, you might want to validate URL and query parameters:

export const loader = async ({
                                   request,
                                   params
                               }) => {
    const parsedParams = await parseParams(params, ParamsSchema);
    const parsedQuery = await parseQuery(request, QuerySchema);
    // Use parsedParams and parsedQuery here
};

Parsing Headers

export const loader = async ({request}) => {
    const parsedHeaders = await parseHeaders(request.headers, HeadersSchema);
    // Use parsedHeaders here
};

Each of these methods ensures that the data you work with matches the schema you define, providing a robust layer of validation for your Remix applications. This approach minimizes runtime errors and enhances the overall security of your application by preventing invalid data from being processed.

Documentation

For detailed documentation on all the features and utilities provided by remix-zod, please refer to the official Zod documentation and the Remix documentation for handling actions and loaders.

Contributing

We welcome contributions to remix-zod! Whether it's bug reports, feature requests, or pull requests, your input is valuable and appreciated. Please refer to the project's GitHub repository for contribution guidelines.

License

remix-zod is MIT licensed.