CODEWITHSUNDEEP
node.js
aksanoble
aksanoble

Reputation: 2570

Is there a way to find out which function isn't letting Node exit?

I'm running a script in NodeJS and the script won't exit. I believe this is because of database connections that are initiated and haven't been closed. Is there a way to list the specific function that isn't letting node exit?

Upvotes: 1

Views: 86

Answers (1)

Malvineous
Malvineous

Reputation: 27300

The why-is-node-running module seems to help here.

Install it temporarily, run your code through it, send it a SIGUSR1 signal when your program is stuck (the command is shown on stdout at launch) and then it will display everything that is still open.

In my case I wanted to run Jest tests through the module, and use ES6 modules, so the launch command was a bit more complex:

NODE_OPTIONS="--experimental-vm-modules" npx why-is-node-running ./node_modules/.bin/jest test/mytestfile.test.js

Normally you would just run

npx why-is-node-running myfile.js

For me, it told me that I had forgotten to close a database connection and that's why the code was lingering at exit.

Upvotes: 1

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