NeoJSON is an elegant and efficient standalone Smalltalk framework to read and write JSON converting to or from Smalltalk objects.
Go ahead and read the NeoJSON paper.
Basically, NeoJSONWriter is used to write a JSON representation of Smalltalk objects to a textual stream. Similary, NeoJSONReader is used to parse a JSON representation from a textual stream into Smalltalk objects.
You can load NeoJSON using Metacello
Metacello new repository: 'github://svenvc/NeoJSON/repository'; baseline: 'NeoJSON'; load.
You can use the following dependency from your own Metacello configuration or baseline
spec baseline: 'NeoJSON' with: [ spec repository: 'github://svenvc/NeoJSON/repository' ].