thule-json

Another minimal and unsafe json parser.

I managed to get general JSON parsing working and ensured I had no memory leaks/issues via valgrind. For a toy JSON parser this is good enough for me.

This is unsafe because I'm missing error handling/reporting.

Usage

// trivial example

#include "thule.h"

int main() {
    const char* src = "{\"username\": \"barrettotte\"}";
    json_value* root = json_parse(src);
    json_object* obj = root->v_object;

    printf("username => %s\n", obj->val->v_string);
    // username => barrettotte

    json_value_free(root);
    return 0;
}

// slightly more complex example

#include "thule.h"

int main() {
    const char* src = "{\"profile\":{\"username\":\"barrettotte\"},\"projects\":[{\"name\":\"thule-json\",\"languages\":[\"C\",\"Makefile\"]},{\"name\":\"qr-asm\",\"languages\":[\"Assembly\"]}]}";
    json_value* root = json_parse(src);
    json_object* projects = root->v_object->next;                           // projects[]
    json_object* thule = projects->val->v_array->items[0]->v_object->next;  // projects[0]

    printf("projects[0].languages[0] => %s\n", thule->val->v_array->items[0]->v_string);
    // projects[0].languages[0] => C

    json_value_free(root);
    return 0;
}

Running Tests

• normal - make
• with memory leak check - make valgrind

References

• Phil Eaton - Writing a Simple JSON Parser
• RFC-8259 JSON Spec