An asynchronous exception handler with long stack traces for node.js
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README.md

trycatch

An asynchronous try catch / exception handler with long stack traces for node.js

Background

See the "Background" from the long-stack-traces module.

Install

npm install trycatch

Basic Example

trycatch(function() {
    function f() {
        throw new Error('foo');
    }

    setTimeout(f, Math.random()*1000);
    setTimeout(f, Math.random()*1000);
}, function(err) {
    console.log("This is an asynchronous scoped error handler!\n", err.stack);
});

Output

$ node examples/setTimeout.js 
This is an asynchronous scoped error handler!
 Error: foo
    at Object.f (/path/to/trycatch/examples/setTimeout.js:5:9)
    at Timer.callback (timers.js:83:39)
----------------------------------------
    at setTimeout
    at /path/to/trycatch/examples/setTimeout.js:8:2
    at Object.<anonymous> (/path/to/trycatch/examples/setTimeout.js:3:1)
    at Module._compile (module.js:404:26)
    at Object..js (module.js:410:10)
    at Module.load (module.js:336:31)
This is an asynchronous scoped error handler!
 Error: foo
    at Object.f (/path/to/trycatch/examples/setTimeout.js:5:9)
    at Timer.callback (timers.js:83:39)
----------------------------------------
    at setTimeout
    at /path/to/trycatch/examples/setTimeout.js:9:2
    at Object.<anonymous> (/path/to/trycatch/examples/setTimeout.js:3:1)
    at Module._compile (module.js:404:26)
    at Object..js (module.js:410:10)
    at Module.load (module.js:336:31)

Returning 500s on Server Request

http.createServer(function(req, res) {
    trycatch(function() {
        setTimeout(function() {
            throw new Error('Baloney!');
        }, 1000);
    }, function(err) {
        res.writeHead(500);
        res.end(err.stack);
    });
}).listen(8000);

Visit http://localhost:8000 and get your 500.