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The Interactive Fiction Virtual Machines Suite - in Javascript


ifvms.js, the Javascript Interactive Fiction Virtual Machines project is a new set of third generation VM engines for web IF interpreters. Like the second generation VMs Gnusto and Quixe, the ifvms.js VMs include a Just-In-Time disassembler/compiler. What justifies the third generation label is that the disassembler generates an Abstract Syntax Tree, allowing Inform idioms, for example for and while loops, to be identified and mapped to Javascript control structures. Identifying these idioms allows the JIT code to run for longer, lowering overheads and therefore increasing performance.

Currently only the Z-Machine is supported, but plans to support Glulx and possibly TADS are in the works. ZVM is used by Parchment. To play a story with it, go to!

ifvms.js is BSD licenced, but please help the community by sharing any changes you make with us.

We use Node.js and Grunt to build and test ifvms.js. Install Node.js, and then install the grunt-cli package:

npm install -g grunt-cli

Then from the ifvms.js directory install our dependencies:

npm install

To build the VMs run the following:


By running the following, Grunt will automatically build the VMs and run the tests.

grunt dev