Website | Examples | API

☕ Dynamic code analysis for JavaScript

Iroh is a dynamic code analysis tool for JavaScript. Iroh allows to record your code flow in realtime, intercept runtime values and manipulate program behaviour on the fly.

npm install iroh

or alternatively the browser distribution from here.

You can play with some live examples here and you can clone them from here.

(A simple textual model is used here)

function factorial(n) {
  if (n === 0) return 1;
  return n * factorial(n - 1);
};
factorial(3);

call factorial ( [3] )
  call factorial ( [2] )
    call factorial ( [1] )
      call factorial ( [0] )
        if
        if end
      call factorial end -> [1]
    call factorial end -> [1]
  call factorial end -> [2]
call factorial end -> [6]

• Runtime call tree graphs
• Runtime type checking
• Runtime code quality
• Runtime test cases
• Realtime code visualizations
• Intercept eval, setTimeout etc.
• Intercept and manipulate code/data on the fly
• Visual learning