JIMP example

jmp.js

const Jimp = require("jimp");

let data = "Dev";

if (process.argv.length > 2) {
    data = process.argv[2];
}

var fileName = 'ic_launcher.png';
var imageCaption = `[${data}]`;
var loadedImage;

Jimp.read(fileName)
    .then(function (image) {
        loadedImage = image;
        return Jimp.loadFont(Jimp.FONT_SANS_32_BLACK);
    })
    .then(function (font) {
        let maxWidth = loadedImage.bitmap.width;
        let maxHeight = loadedImage.bitmap.height;
        loadedImage.print(font, 0, 0,
            {
                text: imageCaption,
                alignmentX: Jimp.HORIZONTAL_ALIGN_CENTER, 
                alignmentY: Jimp.VERTICAL_ALIGN_MIDDLE
            },
            maxWidth,
            maxHeight).write(fileName);
    })
    .catch(function (err) {
        console.error(err);
    });