Browser debugger

In the debugger window, you can set breakpoints in the JavaScript code.

Debugger keyword

If you put the debugger keyword in a script and that you open the devtool, browser debugger will show up.

• On chrome, tip F12 to open devtool
• Then tip F5 to refresh the page, the debugger should kickoff.

function toDebug(){
   let i = 1;
   debugger;
}
toDebug();

• the devtool should stop at the line where the debugger word below is.

Remotely

via the Chrome debugger protocol

• VsCode
• Javascript - How to debug Javascript remotely from IDEA in Chrome/Firefox

Node

https://nodejs.org/api/debugger.html#debugger_v8_inspector_integration_for_node_js