I made a "JSON parser generator" a few months ago. There is no memory overhead because it just puts the json data straight into a C struct while it's parsing.

I made a "JSON parser generator" a few months ago. There is no memory overhead because it just puts the json data straight into a C struct while it's parsing. https://github.com/marel-keytech/jsoncc https://github.com/marel-keytech/jsoncc