what OS use it? is VPS? can we install nodejs? postgresql?
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You can install Node.js and PostgreSQL on any droplet. I could suggest starting with either CentOS or Ubuntu.
You could start with a smaller droplet and upgrade whenever needed. I would recommend monitoring your resources usage and also maybe running some stress tests to see how your app performs depending on different load.
I would recommend having a look at this tutorial here on how to get started with load testing: