How to use axios.post method for a cURL command? (Or fix status code: 415)

Question

We need to run the axios.post equivalent for following cURL command in nodeJS:

  curl -H "Authorization: Basic ZjM4Zj...Y0MzE=" -d grant_type=refresh_token -d refresh_token=NgAagA...NUm_SHo https://accounts.spotify.com/api/token

My Approach:

axios.post("https://accounts.spotify.com/api/token", {
  grant_type: 'refresh_token',
  refresh_token: 'NgAagA...NUm_SHo',
  header: {
    Authorization: 'Basic ZjM4Zj...Y0MzE=',
  }
}).then((resAxios) => {
  console.log(resAxios.data)
  spotifyResult = resAxios.data;
}).catch((error) => {
  console.error(error)
})

Above code returns the following error in reponse:

statusCode: 415,
statusMessage: 'Unsupported Media Type'

Format:

refresh_token should be application/x-www-form-urlencoded

Authorization: Basic <base64 encoded client_id:client_secret>

Refer the 'Authorization Code Flow' for the cURL command, here:

https://developer.spotify.com/documentation/general/guides/authorization-guide/

Feel free to provide with any other variant, i.e., instead of using axios. I preferred it, since it parses the fetched data as well. Please provide with the code to parse it with, if so. I'm a 'beginner' beginner.

Answer 1

Thanks to all the folks: Manuel Spigolon, zx01, Mark Stroebel, Łukasz Szewczak, ponury-kostek, Jakub Luczak, Gerardo Gonzalez :)

I tried this answer on this link, as provided by @zx01 in the comments to the question.

Final code, tailored to the needs:

axios({
    url: "https://accounts.spotify.com/api/token",
    method: "post",
    params: {
        grant_type: "refresh_token",
      //grant_type: "client_credentials", //This works as well.
        refresh_token: 'AQAw95rH0...CnWBE'
    },
    headers: {
      Authorization:'Basic MWQ4Z...dhYmU=',
        "Accept": "application/json",
        "Content-Type": "application/x-www-form-urlencoded"
    },

}).then(function (response) {
    console.log(response.data);
}).catch(function (error) {
    console.log(error);
});

However, the following syntax doesn't seems to work. It again returns with status code 415: Unsupported Media Type.

axios.post("https://accounts.spotify.com/api/token", null, {
    params: {
        grant_type: "refresh_token",
      //grant_type: "client_credentials", //This doesn't work either.
        refresh_token: 'AQAw95rH0...CnWBE'
    },
    headers: {
      Authorization:'Basic MWQ4Z...dhYmU=',
        "Accept": "application/json",
        "Content-Type": "application/x-www-form-urlencoded"
    },
}).then(function (response) {
  console.log(response.data);
}).catch(function (error) {
    console.log(error);
});

It'd be dope if somebody could fix the above code, and reason as to why we're getting that error.

Also notice there is a quomma ',', next to the closing curly braces that packs the 'headers' property.