const json = `{"number": "1234567"}`;

const jsonObj = JSON.parse(json);
jsonObj.number = `${jsonObj.number}000`;
jsonObj.number1 = `${jsonObj.number}000`;
jsonObj.number2 = `${jsonObj.number}000`;
jsonObj.number3 = `${jsonObj.number}000`;
jsonObj.number4 = `${jsonObj.number}000`;
jsonObj.number5 = `${jsonObj.number}000`;
jsonObj.number6 = `${jsonObj.number}000`;
jsonObj.number7 = `${jsonObj.number}000`;
jsonObj.number8 = `${jsonObj.number}000`;
jsonObj.number9 = `${jsonObj.number}000`;
jsonObj.number10 = `${jsonObj.number}000`;
jsonObj.number11 = `${jsonObj.number}000`;
jsonObj.number12 = `${jsonObj.number}000`;
jsonObj.number13 = `${jsonObj.number}000`;


console.log(JSON.stringify(jsonObj));

const json = `{"number": "1234567"}`;

json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);
json.replace(/"number":\s?"(\d+)"/, (_, num) => `"number": "${num}000"`);


console.log(json);