Double-quotes in a Javascript generated string issue

Question

I am loading some text from a file in a node js application using something similar to the following:

var retr = fs.readFileSync( __dirname + tmp).toString();

The files contains a string similar to: a"a

I am using that string to generate a constant value using double quotes:

var MY_CT ="a"a";

Of course, node complains this code is not valid.

How can I transform the double-quotes to init MY_CT properly? I can't modify the source file itself. The source file is not HTML, it is plain text.

Answer 1

What I understood is that you have a variable (let's call it x ) which contains a random string, read from a file, which can contain single quotes or double quotes and you want to generate a file containing that string between quotes so it can be interpreted in JavaScript.

The solution would be:

JSON.stringify(x)

This will return in your case: "a\\"a" which is valid. This will also work when your file contains single quotes.