nginx proxy nodejs, pm2 startup reports 502 error

Question

Use nginx proxy: port 3000

normal

npm start

can access

But use

pm2 start app.js

will report error 502

Answer 1

It turns out it’s because

Express 4.x separates the startup module into ./bin/www by default

Open the bin folder directly, then pm2 start www and it’s done

Source

Answer 2

PM2 has multiple startup methods, one of which can be configured as a startup script in a json file. When starting, pm2 start xxx.json, you can check this out on the official wiki