How to add API key to Axios post request for mailchimp - axios

Question

I'm trying to set up an axios post request to add members to an audience list, but I can't figure out how to add the API key (keeps giving error 401: 'Your request did not include an API key.'). I've tried a bunch of things in the "Authorization" header, like what I put below (also: "Bearer ${mailchimpKey}", "${mailchimpKey}", "Bearer ${mailchimpKey}", "Basic ${mailchimpKey}", and probably more...).
I also don't know what the "username" would be, but "any" worked when I tested the API elsewhere.
Does anyone know how I should set this up?
axios
.post(
`https://${server}.api.mailchimp.com/3.0/lists/${list_id}/members`,
{
email_address: email,
status: "subscribed",
},
{
"User-Agent": "Request-Promise",
Connection: "keep-alive",
Authorization: `Basic any:${mailchimpKey}`,
// Testing on localhost
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Headers": "Content-Type",
}
)

Answer 1

If your intention is to use HTTP Basic authentication, just use the Axios auth config option
axios.post(
`https://${server}.api.mailchimp.com/3.0/lists/${encodeURIComponent(list_id)}/members`,
{
email_address: email,
status: "subscribed",
},
{
auth: {
username: "anystring",
password: mailchimpKey
},
headers: { // personally, I wouldn't add any extra headers
"User-agent": "Request-Promise"
}
}
)
HTTP Basic auth headers look like
Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ=
where the string after "Basic" is the Base64 encoded "username:password" string. Axios provides the auth option as a convenience so you don't need to encode the string yourself.
Some other problems you had were:
Adding request headers outside the headers config option
Attempting to send Access-Control-Allow-Origin and Access-Control-Allow-Headers as request headers. These are response headers only. Adding them to your request will most likely cause more CORS errors