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nodejs - pipe appjs console to a file

nodejs - pipe appjs console to a file


I try to Pipe Appjs Console to a file with this code:

var fs = require('fs');
var logStream = fs.createWriteStream(__dirname+ '/log.txt', { flags: 'a' });

It creates an empty file, but nothing more... With node.exe the "test" goes into the console, not into the log file. The platform is win32, but I don't think it counts.

What's the problem with the code?


Stdout, stderr and a file write stream are all sink type endpoints, so I cannot bind them together. I need to replace stdout and stderr with douplex mock streams so I will be able to bind these mock streams both to the original sinks and the log sink. I am not sure whether console.log and console.error will be affected by replacing the streams with the mechanism supernova suggested, I'd rather use a dedicated logger, which uses the console instead of this workaround.

Problem courtesy of: inf3rno


you have to define getters for process.stdin, process.stdout and process.stderr

var fs = require("fs")
  , errlog = fs.createWriteStream("./err.log", { flags: 'a' })

process.__defineGetter__("stderr", function(){
  return errlog 


this should work

Solution courtesy of: supernova


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This post first appeared on Node.js Recipes, please read the originial post: here

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nodejs - pipe appjs console to a file


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