A through stream that stamps all incoming lines of data with a message and emits it back out
npm install stream-stamp
Usage is simple
var stamp = require('stream-stamp');
var stream = stamp('hello ');
stream.pipe(process.stdout); // "hello world\n" is printed
stream.write('wor');
stream.write('ld\n');
You can make dynamic stamps as well by passing in a function instead
var lines = 0;
var stream = stamp(function() {
return (lines++)+' '; // prefix with line number
});
stream.pipe(process.stdout); // "0 first\n1 second\n2 third\n" is printed
stream.write('first\n');
stream.write('seco')
stream.write('nd\nthird\n');
Stream-Stamp can be useful to stamp output from an application with timestamp or similar.
Assume we have a file called stamp.js
process.stdin
.pipe(stamp(function() {
return new Date().toGMTString()+' ';
}))
.pipe(process.stdout);
process.stdin.resume();
If we now call node my-app.js | node stream.js all log messages from my-app.js would be prefixed by a timestamp.
MIT