The coreJSON library provides a parser that supports key lookups while strictly enforcing the standard (ECMA-404: The JSON Data Interchange Standard). The library is written in C and designed to comply with ISO C90 and MISRA C:2012. It has proofs showing safe memory use and no heap allocation, making it suitable for IoT microcontrollers, but also fully portable to other platforms.
Source Code Organization and Demos
The coreJSON library can be found in the main FreeRTOS download
in the FreeRTOS/FreeRTOS-Plus/Source/coreJSON
directory. A demonstration of the coreJSON library can viewed in the IoT Device Shadow demo
The coreJSON library uses an internal stack to track nested structures in a JSON document. The stack exists for the duration of a single function call; it is not preserved. Stack size may be specified by defining the macro JSON_MAX_DEPTH, which defaults to 32 levels. Each level consumes a single byte.
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