Simple ASCII Chart is a lightweight and flexible TypeScript library designed to create customizable ASCII charts directly in the terminal. It allows you to visualize two-dimensional data, create multiple series, and customize appearance with settings like colors, formatting, and axis labels.
let step = 0;
const interval = 0.1;
const maxPoints = 20;
const sinPoints: Point[] = [];
const cosPoints: Point[] = [];
setInterval(() => {
console.clear();
sinPoints.push([step, Math.sin(step)]);
cosPoints.push([step, Math.cos(step)]);
if (sinPoints.length > maxPoints) sinPoints.shift();
if (cosPoints.length > maxPoints) cosPoints.shift();
console.log(
plot([sinPoints, cosPoints], {
showTickLabel: true,
color: ['ansiRed', 'ansiBlue'],
width: 120,
height: 16,
yRange: [-1, 1],
xLabel: 'Step (π)',
yLabel: 'Amplitude',
legend: { position: 'bottom', series: ['Sine', 'Cosine'] },
axisCenter: [undefined, 0],
formatter: (x, { axis }) => {
if (axis === 'y') return x;
return `${(x / Math.PI).toFixed(1)}π`;
},
}),
);
step += interval;
}, 200);`With Simple ASCII Chart, you can generate insightful, minimalistic charts that work well in terminal environments, making it ideal for command-line tools or logging important data.