JSGI, or JavaScript Gateway Interface, is an interface between web servers and JavaScript-based web applications and frameworks. It was inspired by the Rack for Ruby and WSGI for Python and was one of the inspirations of PSGI for Perl.

Jack at the Wayback Machine (archived December 17, 2014) is a reference implementation of JSGI.

It has been included in and further developed by the CommonJS project.^[1]

All these packages are for Node.JS.

• Q-IO: Promise-based I/O, includes JSGI based HTTP server and client
• jsgi-node: Low level JSGI interface for Node.JS

These frameworks allow using promises with Q:^[2]

• joey on GitHub
• bogart on GitHub

The names are inspired by Sinatra.

• JSGI 0.3 specification
• JSGI 0.2 specification at the Wayback Machine (archived November 4, 2014)
• jack on GitHub