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Life & fun · September 9, 2017

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A library to record and intercept JavaScript at runtime

A library to record and intercept JavaScript at runtime launched on September 9, 2017 with 118 votes, #322 of 3,073 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 9 years on.

Visit maierfelix.github.io ↗Alternativestop 10% of September 2017

In plain words

Iroh is a JavaScript library that enables dynamic analysis by patching code to record and intercept runtime behavior without modifying the original program. Developers can add listeners to track and manipulate function calls, maintain call stack visibility, and visualize code flow. The tool supports intercepting all calls, including Function.toString operations, making it useful for debugging, analyzing, and understanding JavaScript execution patterns.

written from the facts on this page · September 2026

From the sources

If you aren't familiar with the term dynamic analysis , then you can read about it here . Iroh patches your code to be able to record everything happening inside it, but without changing the original program. You can add listeners to the patched code stage and then track and manipulate everything . Iroh also keeps track of the call stack, which makes it possible to view the code's flow and visualize it within any kind of model. Since Iroh allows to intercept all calls in your code, even Function.toString calls can be intercepted, which allows to remain JavaScript's original code reification feature. You can do the same for any other ways like String(ƒ) or ƒ + "" . External ( non-trackable )…from maierfelix.github.io

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