CoreJSON is iOS, OSX (will also work on Linux) Core Foundation based fast parser and generator based on libyajl C library.

Comparison with other JSON frameworks:

iPhone 4.2 Simulator running on MacBook Pro 3.06GHz Intel Core 2 Duo, OSX SL 10.6.6:

iPhone 4:

Tests performed with https://github.com/samsoffes/json-benchmarks

CoreJSONRef json = JSONCreateWithString(NULL, <<NSString or CFStringRef>>);
id object = [(id)JSONGetObject(json) retain];
JSONRelease(json);

// Do whatever you want with object, when done, [object release] it
...

For your own (non Mac AppStore) OSX projects the quick way is to:

1. brew install yajl
2. add /usr/local/lib to Library Search Path and /usr/local/include to Header Search Path
3. Just drop CoreJSON.h and CoreJSON.c to your project and have fun

For OSX and iOS (Mac AppStore/AppStore) projects you need to include libyajl and drop CoreJSON.h and CoreJSON.c files to your project. One way to do it:

1. Go to your project's directory (for which you're using git, right? ;) and git submodule add git:https://github.com/mirek/CoreJSON.git CoreJSON
2. From Xcode add CoreJSON.h and CoreJSON.c files to your project
3. If you're already using libyajl in your project, you are good to go. If not, add libyajl files