Light up code in text editor as it executes
What if when you ran code, the relevant lines lit up in your text editor? - steobrien/light-up-running-code
Light up code in text editor as it executes launched on May 19, 2020 with 14 votes, #1,072 of 4,813 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 6 years on.
In plain words
This developer tool highlights code in a text editor in real-time as it executes, allowing programmers to visually follow program flow during debugging or learning. Available on GitHub, it works with text editors to show which lines are running at each moment. The tool is useful for developers who want to understand execution paths, debug complex programs, or teach coding concepts through visual demonstration of code execution.
written from the facts on this page · September 2026
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