longjohn alternatives and similar modules
Based on the "Debugging / Profiling" category.
Alternatively, view longjohn alternatives based on common mentions on social networks and blogs.
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Theseus
A new type of JavaScript debugger featuring real-time code coverage, retroactive inspection and asynchronous call tree. -
why-is-node-running
Node.js is running but you don't know why? -
llnode
Post-mortem analysis tool which allows you to inspect objects and get insights from a crashed Node.js process. -
TraceGL
Transforms your JavaScript, injecting monitoring code that produces a log of everything that happens. -
swagger-stats
Trace API calls and monitor API performance, health, and usage metrics. -
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njsTrace
Instrument and trace your code, see all function calls, arguments, return values, as well as the time spent in each function. -
stackman
Enhance an error stacktrace with code excerpts and other goodies. -
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thetool
Capture different CPU, memory, and other profiles for your app in Chrome DevTools friendly format. -
vstream
Instrumentable streams mix-ins to inspect a pipeline of streams.
Scout APM - Leading-edge performance monitoring starting at $39/month
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README
longjohn
Long stack traces for node.js with configurable call trace length
Inspiration
I wrote this while trying to add long-stack-traces to my server and realizing that there were issues with support of EventEmitter::removeListener. The node HTTP Server will begin to leak callbacks and any of your own code that relies on removing listeners would not work as anticipated.
So what to do... I stole the code and rewrote it. I've added support for removeListener along with the ability to cut off the number of async calls the library will trace. I hope you like it!
Please thank tlrobinson for the initial implementation!
Production Use
Longjohn collects a large amount of data in order to provide useful stack traces. While it is very helpful in development and testing environments, it is not recommended to use longjohn in production. The data collection puts a lot of strain on V8's garbage collector and can greatly slow down heavily-loaded applications.
Installation
Just npm install it!
$ npm install longjohn
Usage
To use longjohn, require it in your code (probably in some initialization code). That's all!
if (process.env.NODE_ENV !== 'production'){
require('longjohn');
}
// ... your code
Options
Limit traced async calls
longjohn.async_trace_limit = 5; // defaults to 10
longjohn.async_trace_limit = -1; // unlimited
Change callback frame text
longjohn.empty_frame = 'ASYNC CALLBACK'; // defaults to '---------------------------------------------'
Use with Source Maps
As of version 0.2.9 longjonn supports source maps. Just compile your code down to javascript with source map support and run like normal.
For coffee-script, this would look like:
$ coffee --map --compile script.coffee