How to get line and file name from Error in Node.js?

Question

Suppose I have:

var err = new Error('My error!');

How to get line and file name, where Error was created? Like in PHP:

$ex = new \Exception();
$ex->getLine();
$ex->getFile();

err.stack can give you the stack trace.

Freeman Lambda
– Freeman Lambda

2017-05-26 11:36:02 +00:00
Commented May 26, 2017 at 11:36 — Freeman Lambda
– Freeman Lambda, Commented May 26, 2017 at 11:36

chetan dev · Accepted Answer · 2017-05-26 11:41:26Z

3

You can use stack-trace node module. This gives module name and line number

answered May 26, 2017 at 11:41

chetan dev

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arboreal84 · Accepted Answer · 2017-05-26 11:37:24Z

To get the file name for the current file: use __filename.

To get the folder for the current file: use __dirname

To parse the file from an Error object, you need an Error with a stack property, that hopefully points to files. You would need then to parse the filename and line from the stack string or use a module that does so.

> new Error().stack
Error
    at repl:1:1
    at sigintHandlersWrap (vm.js:22:35)
    at sigintHandlersWrap (vm.js:73:12)
    at ContextifyScript.Script.runInThisContext (vm.js:21:12)
    at REPLServer.defaultEval (repl.js:346:29)
    at bound (domain.js:280:14)
    at REPLServer.runBound [as eval] (domain.js:293:12)
    at REPLServer.<anonymous> (repl.js:545:10)
    at emitOne (events.js:101:20)
    at REPLServer.emit (events.js:188:7)

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