How to create an image on the fly with Node.js?
Maybe you could use canvas? There is also an implementation in node.js by Learnboost(TJ). I think this screencast is interesting to look at. As you see from presentation it even renders text in some examples. Also in the npm registry / node modules section I found a lot more interesting links
Here's some simple code using the canvas library:
const fs = require("fs"), { createCanvas } = require("canvas");const WIDTH = 100;const HEIGHT = 50;const canvas = createCanvas(WIDTH, HEIGHT);const ctx = canvas.getContext("2d");ctx.fillStyle = "#222222";ctx.fillRect(0, 0, WIDTH, HEIGHT);ctx.fillStyle = "#f2f2f2";ctx.font = "32px Arial";ctx.fillText("Hello", 13, 35);const buffer = canvas.toBuffer("image/png");fs.writeFileSync("test.png", buffer);This is the resulting test.png file:
To run it, you must first install the library:
npm i canvasInstead of saving it to a file, you could, of course, send it as the response of an API call.
For more details on how to draw text using the canvas, see this MDN article.