而不是Axios，使用npm的@mailchimp/mailchimp_marketing，可以如下复制：

const mailchimp = require("@mailchimp/mailchimp_marketing");
const express = require("express");
const bodyParser = require("body-parser");
const app = express();

//Using body-parser
app.use(express.urlencoded({extended:true}));

//The public folder which holds the CSS
app.use(express.static("public"));

//Listening on port 3000 and if it goes well then logging a message saying that the server is running
app.listen(3000, function () {
console.log("Server is running at port 3000");
});

//Sending the signup.html file to the browser as soon as a request is made on localhost:3000
app.get("/", function (req, res) {
res.sendFile(__dirname + "/signup.html");
});

//Setting up MailChimp
mailchimp.setConfig({
apiKey: "YOUR API KEY-usX",
server: "usX"
});

//As soon as the sign in button is pressed execute this

app.post("/", function (req,res) {
const firstName = req.body.fName;
const lastName = req.body.lName;
const email = req.body.email;

//Add a contact to an audience
const listId = "YOUR AUDIENCE ID";
const subscribingUser = {
  firstName: firstName,
  lastName: lastName,
  email: email
};
//Uploading the data to the server
async function run() {
  const response = await mailchimp.lists.addListMember(listId, {
  email_address: subscribingUser.email,
  status: "subscribed",
  merge_fields: {
  FNAME: subscribingUser.fName,
  LNAME: subscribingUser.lName
  }
});
//If all goes well logging the contact's id
res.sendFile(__dirname + "/success.html")
console.log(`Successfully added contact as an audience member. The contact's id is ${response.id}.`);
}
//Running the function and catching the errors (if any)

  run().catch(e => res.sendFile(__dirname + "/failure.html"));
});

您可以像下面这样向MailChimp发出发布请求：

const url = "https://{dc_here}.api.mailchimp.com/3.0/lists/{list_id}"
const data = {
    members:[{email_address: "sachin.test.11@gmail.com",status:"subscribed"}]
}
    
const options = {
auth: {
    username: "anystring",
    password: "{mailchimp_key_here}"
    },
}
const axios_response = await axios.post(url, data, options);
console.log(axios_response.data);

**注意：**将{dc_here}替换为有效dc。示例：us-21

将{list_id}替换为有效的列表ID。示例：7762 d 0 b7 cd
将{mailchimp_key_here}替换为有效密钥。示例：fd 14 c93 dadd 62130 afc 7 ee 406 b45 d3 a2-us 21
以上三个细节你可以在Mailchimp网站上找到