无法让节点检查员工作

Question

I have a basic express app that I am trying to debug but I cannot get node inspector working correctly on OSX

In one terminal window I run:

node --debug-brk server.js

In another terminal window I run:

node-inspector

Node Inspector opens here:

http://localhost:8080/debug?port=5858

In another browser tab I try to open my site here

http://localhost:8080/

I get printed to screen

Cannot GET /

If I open instead

http://localhost:3000

I get my app because I set this in server.js

app.set('port', process.env.PORT || 3000);

But now none of the breakpoints work in the debugger

I am sure I am doing something stupid here but I have read the docs and tutorials over and over and I cannot get this to work.

The other things I have tried is in one terminal window running:

node-debug server.js

I get the same thing as above. Debug inspector opens and is stopped at first line and my site at

http://localhost:8080

still says

Cannot GET /

I also tried

node-debug --no-debug-brk server.js

An I get the same result except node inspector in not stopped at first line

Answer 1

Debug inspector opens and is stopped at first line...

When node-inspector starts debugging an application, by default, it stops at the first line, during the app starting process. If you try to access your app at http://localhost:3000 with the debugger stopped at the first line, you'll never get to your breakpoints.

Before trying anything, you must resume script execution or start node-inspector with the --no-debug-brk option, to prevent stopping at the first line.

To make sure node-inspector is not stopping at any line at all, what you should do:

• put a breakpoint at the line where you have your app.listen call, or;
• a more extreme solution: put a breakpoint at every line of your main file.