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A tiny, fast JavaScript and/or Objective-J compiler with built in preprocessor. Written in JavaScript.

It uses a parser extended from the Acorn JavaScript parser by Marijn Haverbeke.

Format generated code

The generated code can be formatted by providing a format description file with the '--formatDescription' option There are some example files in the format folder.

It can also include comments with the '--includeComments' option.


Objective-J is a superset of Javascript. If it compiles a pure Javascript file it will generate the same code back again. This allows the compiler to be used as a beautifier for Javascript.


The parser has a built in C like preprocessor.


#define MAX(x, y) (x > y ? x : y)
var m1 = MAX(a, b);
var m2 = MAX(1420);

Will be compiled to:

var m1 = a > b ? a : b;
var m2 = 14 > 20 ? 14 : 20;

For more info see

Objective-J limitations: It can't compile Objective-J code that depends on other Objective-J files. The Objective-J load and runtime is needed for this. But it will work as long as you declare any superclass in the same file. This will be fixed when the Objective-J load and runtime will be a node module