How can I implement data caching in Svelte using fetch?

How can I implement data caching in Svelte using fetch?

You can implement data caching in Svelte by using a store to hold your fetched data and checking if the data is already cached before making a new fetch request.

What kind of store should I use for caching?

You can use a writable store from Svelte's store module. This allows you to easily update and subscribe to the cached data.

Can you show me a code example?

Sure! Here's a simple example:

import { writable } from 'svelte/store';

const dataStore = writable(null);

async function fetchData(url) {
    const cachedData = get(dataStore);
    if (cachedData) return cachedData;

    const response = await fetch(url);
    const data = await response.json();
    dataStore.set(data);
    return data;
}

This checks the store first and only fetches if there's no cached data.

How do I handle errors during the fetch?

You can wrap your fetch call in a try-catch block to handle errors gracefully. For example:

async function fetchData(url) {
    try {
        const response = await fetch(url);
        if (!response.ok) throw new Error('Network response was not ok');
        const data = await response.json();
        dataStore.set(data);
        return data;
    } catch (error) {
        console.error('Fetch error:', error);
        // Handle error accordingly
    }
}