I have a crontab running every hour. The user running it has environment variabless in the .bash_profile that work when the user runs the job from the terminal,
I'm using Oh-my-zsh in my macbook so I've tried many things to get the crontab task runs but finally, my solution was prepending the .zshrc before the command to run.
*/30 * * * * . $HOME/.zshrc; node /path/for/my_script.js
This task runs every 30 minutes and uses .zshrc profile to execute my node command.
Don't forget to use the dot before the $HOME var.