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struct_json

Fast JSON parsing in C using structs and Macros

What is this?

struct_json is a C libary that provide Macros for fast JSON parsing using structs. Usually, we know what attributes a JSON has and their types when we make an AJAX request. struct_json take advantage of this by letting the user specify the JSON attributes and datatypes so it can generate a dynamic function that parses the JSON and put the data into an already existing struct.

Call format

CREATE_STRUCT_FROM_JSON(json,out,(attribute,type)...)
UPDATE_STRUCT_FROM_JSON(json,typeof(out),out,(attribute,type)...)
CREATE_JSON_FROM_STRUCT(struct,typeof(struct),out,(attribute,type)...)

Supported Types

  • int
  • float
  • string
  • json (stored as a string)
  • bool (stored as an unsigned char)
  • type_list (any of the above types, but as a list)

Example Usage

JSON to Struct, containing attributes status (an int) and msg (a string)

char *json = "{\"status\":200,\"msg\":\"OK\"}";
CREATE_STRUCT_FROM_JSON(json,out,status,int,msg,string)

Struct to JSON, containing attributes status (an int) and msg (a string)

char *json;
struct {int status; char *msg;} out;
CREATE_JSON_FROM_STRUCT(out,typeof(out),json,status,int,msg,string)