Form Data demo

formdata.js

// payload to send in the API request
const payload = {
    email: "example@example.com",
    recipients: [
        'test1@example.com',
        'test2@example.com',
    ],
    attachment: fileObject,
}

// creating a new FormData instance
const formData = new FormData();

for (let key in payload) {

    let value = payload[key];
    
    if (Array.isArray(value)) {
        value.forEach((item, index) => {
            // pack array content in FormData using the append method
            // first argument is the key, and the second argument is the value
            // the form data key should look something like: 'recipients[0]', 'recipients[1]'
            formData.append(`${key}[${index}]`, item);
        });
    } else {
        formData.append(key, value);
    }
}