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Why LLM-Generated Code Breaks in Production: The Hidden Zero-Width Unicode Bug

This story is from 2026-10-07. It is preserved in the archive; the latest stories are on the live feed.

You copy a neat snippet from an LLM chat window. You paste it into VS Code. Everything looks completely fine. The indentation is right, the variable names are clear, and there is no red squiggle in your editor. Then you run your build: SyntaxError: Unexpected token '​' ( U+200B ) in JSON at positio…

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  1. 2026-10-07 16:03 · DEV Community — AI
    Why LLM-Generated Code Breaks in Production: The Hidden Zero-Width Unicode Bug

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