D3.js Charts in Svelte
Render D3 visualizations inside Svelte components using reactive bindings and actions.
D3.js Charts in Svelte is a free Sveltejs Academy lesson on CoddyKit — lesson 2 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Sveltejs Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Why D3 with Svelte
D3 is the king of data visualization; Svelte's reactivity makes it easier than ever to use.
Approach
Let Svelte render the SVG; use D3 for scales, layouts, and helpers.
Install
Add D3 (or specific submodules like d3-scale, d3-shape).
npm install d3Scales
Use D3 scales to map data to pixels.
import { scaleLinear } from "d3-scale";
const x = scaleLinear().domain([0, 100]).range([0, width]);Render Bars Reactively
Use {#each} to render data-driven elements.
{#each data as d}
<rect x={x(d.x)} y={y(d.y)} width="10" height={height - y(d.y)} fill="steelblue" />
{/each}Avoid d3-selection
Let Svelte manage the DOM; reach for d3-selection only for complex transitions.
Axes
Render axes by mapping ticks with {#each} and your scales.
Tooltips
Add hover state with mouseenter/mouseleave on each shape; show a positioned tooltip.
Responsive
Track container width with ResizeObserver; rescale on change.
Animations
Use Svelte transitions on SVG shapes or tween scale ranges with the motion stores.
Component Library
LayerCake is a Svelte-specific chart library built around this pattern.
Quick Check
What part of D3 is most useful in Svelte?
Recap
Use D3 for math (scales, layouts) and Svelte for rendering SVG. Avoid d3-selection mostly for clean integration.
Frequently asked questions
Is the “D3.js Charts in Svelte” lesson free?
Yes — the full text of “D3.js Charts in Svelte” is free to read here on the web, and the Sveltejs Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Sveltejs Academy course, upgrade to CoddyKit PRO.
What will I learn in “D3.js Charts in Svelte”?
Render D3 visualizations inside Svelte components using reactive bindings and actions. You practise Sveltejs Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Sveltejs Academy?
No prior experience is required. Sveltejs Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 2 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “D3.js Charts in Svelte” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Sveltejs Academy lesson?
Yes. Every Sveltejs Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.