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JSGI & Jack

JSGI is a web server interface specification for JavaScript, inspired by Ruby’s Rack (http://rack.rubyforge.org/) and Python’s WSGI (http://www.wsgi.org/). It provides a common API for connecting JavaScript frameworks and applications to webservers.

Jack is a collection of JSGI compatible handlers (connect web servers to JavaScript web application/frameworks), middleware (intercept and manipulate requests to add functionality), and other utilities (to help build middleware, frameworks, and applications).

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JSGI Specification

View the JSGI specification.

Example JSGI Application

function(env) {
    return {
        status : 200,
        headers : {"Content-Type":"text/plain"},
        body : ["Hello world!"]
    };
}

JSGI vs. Rack

JSGI applications are simply functions, rather than objects that respond to the “call” method. The body must have a forEach method which yields objects which have a toByteString method, as opposed to Strings.

JSGI vs. WSGI

WSGI uses a start_response function to set the HTTP status code and headers, rather than returning them in an array. JSGI is similar to WSGI 2.0: http://www.wsgi.org/wsgi/WSGI2.0](http://www.wsgi.org/wsgi/WSGI2.0).

Contributors

Acknowledgments

This software was influenced by Rack, written by Christian Neukirchen.

http://rack.rubyforge.org/

License

Copyright (c) 2009 Thomas Robinson <280north.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.