let messageData = { phoneNumber: '1234567890', // the recipient's phone number message: 'Hello, this is a test message.' }; fetch('/send-sms', { method: 'POST', body: JSON.stringify(messageData), headers: { 'Content-Type': 'application/json' } }) .then(response => response.json()) .then(data => console.log(data)) .catch(error => console.error(error));