I Built a Coupon Tool Without Writing a Single Line of Code
I'll be honest — I didn't write a single line of code for this tool. Not because I'm lazy, but because handling coupon codes in Excel had driven me crazy.
Back when I dealt with redemption codes and virtual keys, I'd paste hundreds of them into Excel, then manually find-replace, add prefixes, dedupe — for hours. Once a client asked me to split 1000 codes into groups of 50, I spent half an hour copy-pasting and still got two groups wrong. After that I swore there had to be a better way.
I Overcomplicated It At First
I first told AI "build me a coupon tool" and it spat out some React project with components and state management. I can't even write frontend code — what am I supposed to do with that?
I wised up and said: just one HTML file that I can double-click to open. Left box for input, right box for output. No frameworks, no backend. That's when it started writing real code.
How Many Times I Had to Fix It
First version: text replace worked, but the prefix/suffix button did nothing. I told AI, it said it forgot to bind the event. Then the "delete by position" feature had a bug — when I said "delete the 3rd character," it deleted the first three instead. I went back and forth on this 3 or 4 times before AI finally understood "character N" vs "characters N to M."
The most annoying one was the "trim spaces" feature. Copy-pasted codes always have invisible spaces, but AI's regex only handled regular spaces — it missed full-width spaces and tabs. I had to send screenshots and raw text over two rounds before it worked.
I Was Paranoid About Data Security
Coupon codes are sensitive. What if they got uploaded to a server? The first thing I did after the code was done was search the whole file for fetch and XMLHttpRequest. No external requests anywhere — all processing local. That's the only reason I dared to launch it.
The Real Takeaway
It took two days, but most of that was debugging. AI writes fast, but it doesn't know what you actually need. You have to have been through the pain yourself to tell it "no, that's wrong." If you've never manually processed coupon codes, you wouldn't even know what features to ask for.
So AI doesn't replace developers — it turns your ideas into something usable quickly. But you have to know what you want. Otherwise you get something that looks perfect but falls apart in real use.