Node js on ubuntu calls killed, how to prevent it?

Question

Node.js

The problem is that I store JSON in a text file, weighing more than 50-100mb. I open it with fs and put it in a variable as a hash table. On the server, the node parses the data and uploads it to the same file. If the file size is more than 100MB, the process is killed when I open this text file and put data into the variable, apparently due to lack of RAM. How to solve this problem, use the database?