Read all text from stdin to a string

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problem ：

I'm writing a program in Node.js that (in some situations) wants to act as a simple filter: read everything from stdin (up to end of file), do some processing, write the result to stdout. I'm using Node.js Write a program , it （ In some cases ） Hope to act as a simple filter ： From standard input （ Until the end of the file ） Read everything , Do some processing , Write results to standard output .

How do you do the 'read everything from stdin' part? How do you do “ Read everything from standard input ” part ？The closest solutions I've found so far, seem to work either for one line at a time from the console, or else only work when stdin is a file not a pipe. up to now , The closest solution I've found seems to run one line at a time from the console , Or only in stdin Works when it is a file, not a pipe .

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Solution ：

Reference resources ： https://stackoom.com/en/question/23j6H