TypeScript to pass JSON object to MySQL

const aaa: any = {
    "patta eka": 4,
    "yo eloo": "dsadd",
    "hmm fatta": "hik"
};

    let value = `JSON_OBJECT(`;

for (var key in aaa) {
    if (aaa.hasOwnProperty(key)) {
        console.log(key + ": " + aaa[key]);
        value += `"${key}", `;
        if (typeof aaa[key] === "string") {
          value += `"${aaa[key]}",`;
        } else {
          value += `${aaa[key]},`;
        }
    }
}

value = value.slice(0, -1);
value += `)`;

let _query: string = `CALL testing(${value})`;