The simplest way to read a file in Node is to use the fs.readFile() method, passing it the file path and a callback function that will be called with the file data (and the error):

const fs = require('fs')

if (err) {
console.error(err)
return
}
console.log(data)
})


Alternatively, you can use the synchronous version fs.readFileSync():

const fs = require('fs')

try {
console.log(data)
} catch (err) {
console.error(err)
}


The default encoding is utf8, but you can specify a custom encoding using a a second parameter.

Both fs.readFile() and fs.readFileSync() read the full content of the file in memory before returning the data.

This means that big files are going to have a major impact on your memory consumption and speed of execution of the program.

In this case, a better option is to read the file content using streams.