Axios POST status 400 bad request [duplicate] - httprequest

Question

This question already has an answer here:
Getting error when using axios POST
(1 answer)
Closed 3 years ago.
I am trying to make a POST request to the spotify web api. I am using this piece of code for doing so:
axios.post(ACCESS_URL, {
"grant_type": 'authorization_code',
"code": code,
"redirect_uri": REDIRECT_URI
},
{
headers: {
"Authorization": "Basic " + Buffer.from(CLIENT_ID + ":" + CLIENT_SECRET).toString("base64"),
'Content-Type': 'application/x-www-form-urlencoded'
},
})
In the snippet above code is the users authorization code and everything else are server constants. The problem is that I am getting the following error when I am performing the request:
error: 'unsupported_grant_type',
error_description: 'grant_type must be client_credentials, authorization_code or refresh_token'
As you can see, the grant type that I am sending in the request body is one of the 3 specified grant types, but I am stil getting status 400 and I can't figure out why. Any ideas?
Thanks in advance since I am sure it's a silly question with an easy answer, but I just don't see it

Answer 1

See Unsupported grant type error when requesting access_token on Spotify API with Meteor HTTP for a similar problem.
Spotify expects the grant_type in the query string parameters, not in the post request body. Actually the configuration in the above question/answer looks pretty similar to the axios config. Simply wrap your first three parameters into a params object:
axios.post(ACCESS_URL, {
params: {
"grant_type": 'authorization_code',
"code": code,
"redirect_uri": REDIRECT_URI
},
headers: {
"Authorization": "Basic " + Buffer.from(CLIENT_ID + ":" + CLIENT_SECRET).toString("base64"),
'Content-Type': 'application/x-www-form-urlencoded'
}
})

Answer 2

I found the solution. I had to encode the data using querystring like this:
return axios.post(ACCESS_URL,querystring.stringify({
"grant_type": 'authorization_code',
"code": code,
"redirect_uri": REDIRECT_URI
}),
{headers: {
"Authorization": "Basic " + Buffer.from(CLIENT_ID + ":" + CLIENT_SECRET).toString("base64"),
'Content-Type': 'application/x-www-form-urlencoded'
}
}
)
Thanks everyone for the help