Heck, if: - you can target PDF - you’re married to a JS stack - your motivation is (quoting the article) > When you purchase a shipping label through them,

Heck, if: - you can target PDF - you’re married to a JS stack - your motivation is (quoting the article) > When you purchase a shipping label through them, they give you the output in either a PDF, PNG, or ZPL format. ZPL would be ideal, since it's just ASCII text which can easily be modified, or even stored in a database along side each order. It seems like a much more reasonable intermediate format is SVG or JSX, both of which have mature to-PDF solutions, and both of which have much more well-known manipulation stories. Of course, that doesn’t lead to an absolutely bonkers blog title like this. But for anyone considering a similar setup, there are much more conservative options.