Vala: build & parse rough example.

json_parse_build.vala

// valac --pkg json-glib-1.0 json_parse_build.vala
using Json;

const string JSON_PATH = "/path/to/file.json"; 

int main() {
	build_example();
	read_example();
  return 0;
}

void read_example() {
	try {
		Json.Parser parser = new Json.Parser();
		parser.load_from_file(JSON_PATH);
		
		Json.Generator generator = new Json.Generator();
		generator.set_root(parser.get_root());
		generator.set_pretty(true);
		
		size_t len;
		string str_data = generator.to_data(out len);
		
		stdout.printf(@"$(str_data)\n\n");
	} catch (Error e) { 
		stderr.printf(@"$(e.message)"); 
	} 
}

void build_example() {
	Json.Builder builder = new Json.Builder();
	
  // New object
	builder.begin_object();
	builder.set_member_name("entries");     // member name
	builder.begin_array();                  // create array as value
	
  // Array member 1: new object
	builder.begin_object();
	builder.set_member_name("id");          // new member -> name: "ID", value: 1
	builder.add_int_value(1);
	builder.set_member_name("key");         // new member -> name: "key", value: "smth"
	builder.add_string_value("smth");
	builder.set_member_name("value");       // new member -> name: "value", value: "smth related abt the key"
	builder.add_string_value("smth longer related abt the key");
	builder.end_object();   // close object
	
  // Array member 2: new object
	builder.begin_object();
	builder.set_member_name("id");          // new member -> name: "ID", value: 2
	builder.add_int_value(2);
	builder.set_member_name("key");         // new member -> name: "key", value: "other key"
	builder.add_string_value("other key");
	builder.set_member_name("value");       // new member -> name: "value", value: "key related abt the key"
	builder.add_string_value("key related abt the key");
	builder.end_object();   // close object
	
	builder.end_array();    // close array
	builder.end_object();   // close object
	
	Json.Node root = builder.get_root();
	Json.Generator generator = new Json.Generator();
	generator.set_root(root);
	generator.set_pretty(true);
	
	size_t len;
	string str_data = generator.to_data(out len);
	
	stdout.printf(@"$(str_data)\n\n");
}