Why Cross-Platform GraphQL Checklist for Preact: A Step-by-Step Guide
Preact has emerged as a lightweight alternative to React for building cross-platform applications, offering a 3KB virtual DOM and compatible API. When paired with GraphQL—a query language for APIs that delivers only the data you need—developers gain a powerful stack for efficient, cross-platform development. This guide walks through the essential checklist and step-by-step implementation for integrating GraphQL into cross-platform Preact projects.
Why Use GraphQL with Cross-Platform Preact?
GraphQL solves common pain points in cross-platform development: over-fetching, under-fetching, and managing multiple endpoints. For Preact apps running on web, mobile (via Capacitor or React Native), and desktop (via Electron), a single GraphQL endpoint standardizes data fetching across all platforms. Preact’s small footprint ensures GraphQL integration doesn’t bloat your bundle, even on low-powered devices.
Cross-Platform GraphQL Checklist for Preact
Before diving into implementation, verify these prerequisites are met:
- Node.js v16+ and npm/yarn installed
- Preact CLI or Vite with Preact template set up
- GraphQL server endpoint (e.g., Apollo Server, Hasura, or AWS AppSync)
- Cross-platform tooling configured (Capacitor for mobile, Electron for desktop, if targeting those platforms)
- TypeScript (optional but recommended for type-safe GraphQL queries)
Step-by-Step Implementation Guide
Step 1: Set Up Preact Project
Initialize a new Preact project using Vite for faster builds:
npm create vite@latest preact-graphql-demo -- --template preact
cd preact-graphql-demo
npm install
For cross-platform mobile support, add Capacitor:
npm install @capacitor/core @capacitor/cli
npx cap init preact-graphql-demo com.example.preactgraphql
npx cap add android
npx cap add ios
Step 2: Install GraphQL Dependencies
Install Apollo Client (the most popular GraphQL client) and its Preact/React compatibility helpers:
npm install @apollo/client graphql @apollo/client/preact
Note: @apollo/client/preact provides a compatibility layer since Preact mirrors React’s API, so Apollo Client works seamlessly with minimal configuration.
Step 3: Configure Apollo Client
Create an Apollo Client instance pointing to your GraphQL endpoint. In src/apollo.js:
import { ApolloClient, InMemoryCache } from '@apollo/client';
import { setPreactContext } from '@apollo/client/preact';
const client = new ApolloClient({
uri: 'https://your-graphql-endpoint.com/graphql',
cache: new InMemoryCache(),
});
setPreactContext(client);
export default client;
For cross-platform projects, ensure the GraphQL endpoint is accessible from all target platforms (use HTTPS for mobile/desktop builds to avoid mixed content errors).
Step 4: Wrap App with Apollo Provider
In your entry file (src/index.js or src/main.jsx), wrap the Preact app with ApolloProvider to make the client available across all components:
import { render } from 'preact';
import { ApolloProvider } from '@apollo/client/preact';
import App from './App';
import client from './apollo';
render(
,
document.getElementById('app')
);
Step 5: Write and Execute GraphQL Queries
Define a GraphQL query to fetch data. For example, a query to fetch a list of users:
import { gql } from '@apollo/client';
export const GET_USERS = gql`
query GetUsers {
users {
id
name
email
}
}
`;
Use the useQuery hook in a Preact component to fetch and render data:
import { useQuery } from '@apollo/client/preact';
import { GET_USERS } from './queries';
function UserList() {
const { loading, error, data } = useQuery(GET_USERS);
if (loading) return Loading...;
if (error) return Error: {error.message};
return (
{data.users.map((user) => (
{user.name} ({user.email})
))}
);
}
export default UserList;
Step 6: Handle Mutations (Data Updates)
For creating, updating, or deleting data, use GraphQL mutations with the useMutation hook. Example mutation to add a new user:
export const ADD_USER = gql`
mutation AddUser($name: String!, $email: String!) {
addUser(name: $name, email: $email) {
id
name
email
}
}
`;
Implement the mutation in a component:
import { useMutation } from '@apollo/client/preact';
import { ADD_USER } from './mutations';
import { GET_USERS } from './queries';
function AddUserForm() {
const [addUser, { data, loading, error }] = useMutation(ADD_USER, {
refetchQueries: [{ query: GET_USERS }], // Refetch user list after mutation
});
const handleSubmit = (e) => {
e.preventDefault();
const form = e.target;
addUser({
variables: {
name: form.name.value,
email: form.email.value,
},
});
form.reset();
};
return (
{loading ? 'Adding...' : 'Add User'}
{error && Error: {error.message}}
{data && User added successfully!}
);
}
export default AddUserForm;
Step 7: Optimize for Cross-Platform
Apply these optimizations for cross-platform Preact GraphQL apps:
- Use persistent caching with Apollo Client’s InMemoryCache to reduce network requests on mobile/desktop.
- Implement error boundaries to handle GraphQL errors gracefully across all platforms.
- Use code splitting for GraphQL queries to reduce initial bundle size.
- Test GraphQL integration on all target platforms (web, mobile, desktop) to ensure endpoint accessibility.
Conclusion
Integrating GraphQL into cross-platform Preact projects streamlines data management, reduces bundle bloat, and standardizes data fetching across platforms. Following this checklist and step-by-step guide ensures a smooth setup, letting you focus on building great user experiences. Start with the prerequisites, configure Apollo Client, and iterate on queries and mutations to fit your app’s needs.









