Node.js doesn’t store logs in the file. Logs are printed into the STDERR and
output is printed into the STDOUT.
However, you can change that when you runt the javascript code from the shell and redirect the error output and standard output to separate files:
node my_app.js > my_app_log.log 2> my_app_err.log
Alternatively (recommended), you can add logging inside your application either manually or with one of the many log libraries:
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