Merge 2 images with node.js?

You might need this: https://github.com/zhangyuanwei/node-images

Cross-platform image decoder(png/jpeg/gif) and encoder(png/jpeg) for Nodejs

images("big.jpg").draw(images("small.jpg"), 10, 10).save("output.jpg");

I do no have enough reputation to add a comment, or else I would to Schmidko's answer.

Sharp works well, however, overlayWith is deprecated and you instead need to use composite. See below:

sharp(path + 'example.jpg')
       .composite([{input: path + 'logo.png', gravity: 'southeast' }])
       .toFile(path + 'output.png');

If you would like to center the image being overlayed: gravity: 'centre'

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