README.md

Possibly the worst way to encode json in C?

% emcc example.c -o example.js -s DEFAULT_LIBRARY_FUNCS_TO_INCLUDE='$UTF8ToString,$stringToNewUTF8

% node example.js
JSON: {"name":"Captain Pants","id":0}

example.c

// Compile with emcc -s DEFAULT_LIBRARY_FUNCS_TO_INCLUDE='$UTF8ToString,$stringToNewUTF8'
#include <stdio.h>
#include <emscripten.h>

int main() {

  struct player {
    char *name;
    int id;
  } foo;

  foo.name = "Captain Pants";
  foo.id = 0;

  // Use JavaScript's JSON.stringify() to generate JSON into a char* for use in C.
  const char *json = (const char *)EM_ASM_PTR({
    return stringToNewUTF8(JSON.stringify({
      name: UTF8ToString($0),
      id: $1
    }));
  }, foo.name, foo.id);

  printf("JSON: %s\n", json);
  free((void *)json);


  return 0;
}