Axios login request: Unauthorized, request status code 401 - node.js

Question

I'm trying to get an authorization token by making a request to an api using axios:
axios({
method: 'post',
url: 'http://62.110.134.187/api/signin',
headers: { 'content-type': 'application/x-www-form-urlencoded' },
auth: {
username: usr,
password: pwd
}
}).then(function (response) {
console.log(response)
}).catch(function (error) {
console.log('Error: ' + error)
})
I'm getting always status code 401(Unauthorized):
Error: Request failed with status code 401
Where I'm doing wrong?
The fact is that making the same request using python works fine:
payload = "username=%s&password=%s" % (usr,pwd)
headers = {'content-type': 'application/x-www-form-urlencoded'}
response = requests.request("POST", url_login, data=payload, headers=headers)
print(response.text)
data = response.json()
token = data["token"]

Answer 1

By sending username and password in auth: {} in axios, you are doing the basic-authentication, basically sending Authorization: basic <base64(user:pass)> header.
As per working python program, you need to send the username and password as part of the request body. You need to serialize the body params for url-encoded content type as well.
e.g.
const querystring = require('querystring');
axios({
method: 'post',
url: 'http://62.110.134.187/api/signin',
headers: { 'content-type': 'application/x-www-form-urlencoded' },
data: querystring.stringify({
username: usr,
password: pwd
})
}).then(function (response) {
console.log(response)
}).catch(function (error) {
console.log('Error: ' + error)
})