Integrating DHL Rates API in ReactJs using NodeJs

I want to integrate DHL API into my react js website using node js with express. I have written the backend code and the front end code that would allow me to do this, but when I try to check the rates for a shipment, it gives me this error "Error: Request failed with status code 500"

I don’t know what I am doing wrong when trying to get the DHL API to work.

here is my code:

CheckRates.js:

    const [fromCountires,setFromCountries] = useState("");
    const [fromCountriesCode,setFromCountriesCode] = useState("");
    const [fromCountriesCapital,setFromCountriesCapital] = useState("");
    const [toCountries,setToCountries] = useState("");
    const [toCountriesCode,setToCountriesCode] = useState("");
    const [toCountriesCapital,setToCountriesCapital] = useState("");
    const [weight,setWeight] = useState("");



const getRateEstimate = () => {
                

      const options = {
        method: 'GET',
        url: "http://localhost:3001/api/dhl",
        params: {
          accountNumber: 'myaccountnumber',
          originCountryCode: fromCountriesCode,
          originCityName: fromCountriesCapital,
          destinationCountryCode: toCountriesCode,
          destinationCityName: toCountriesCapital,
          weight: weight,
          length: '5',
          width: '5',
          height: '5',
          plannedShippingDate: date,
          isCustomsDeclarable: 'false',
          unitOfMeasurement: 'metric',
          
        },
        headers: {
          Authorization: 'Basic myauth',  
        }
      };
     
        axios.request(options).then((response) => {
            console.log(response.data);
            setData(response.data);
        }).catch((error) => {
            console.error(error);
        });
      }

nodejs server, index.js:

require('dotenv').config();
const express = require('express');
const bodyParser = require('body-parser');
const cors = require('cors');
const mysql = require('mysql');
const cookieParser = require('cookie-parser');
const session = require('express-session');
const multer = require('multer');
const path = require('path');
const request = require('request');
const port = 3001
const app = express();

//Middleware 

app.use(cors({
    origin: '*',
    credentials: true,
    methods: ['GET', 'PUT', 'POST'],
    allowedHeaders: ['Content-Type', 'Authorization']
}));
app.use(express.json());
app.use(bodyParser.urlencoded({extended: true}));

app.get("/",(req,res) => {
  res.send("Root App");
})

app.get('/api/dhl', (req, res) => {
  
  request(
    {url: 'https://express.api.dhl.com/mydhlapi/test'},
    (error, response, body) => {
      if (error || response.statusCode !== 200) {
        return res.status(500).json({ type: 'error', });
      }
      res.json(JSON.parse(body));
    }
  )
});