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I have some strings like s0 = "\"first line,\\nsecond line,\\n\"", and some other strings like s1 = "first line,\nsecond line,\n", where s0 is like the string representation of the whole s1. I wonder if there's any easy way to convert s0 and s1 both way. I understand I could do replace. However, there might be a whole lot of other escape sequences to take care of.

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    JSON.parse(s0)? Commented Dec 15, 2018 at 21:28

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You could use JSON methods:

s0 = "\"first line,\\nsecond line,\\n\"",
s1 = "first line,\nsecond line,\n"

console.log('Parse s0 ::', JSON.parse(s0))
console.log('Stringify s1 ::', JSON.stringify(s1))

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