README.md

1. Create new Spotify Application

Visit https://developer.spotify.com/dashboard/applications login and create a new Application

After create, you will get your Client ID & Client Secret.

Then click EDIT SETTINGS Button, add http://localhost:3000 to Redirect URIs

2. Get Authorization Code

Visit following URL after replace $CLIENT_ID to yours

https://accounts.spotify.com/en/authorize?client_id=$CLIENT_ID&response_type=code&redirect_uri=http:%2F%2Flocalhost:3000&scope=user-read-currently-playing%20user-top-read

Agree to this application to access your info, after that your will be redirect to a new page, the url like this: http://localhost:3000?code=$CODE

this $CODE is your Authorization Code, it will be used to generate access_token at next step.

3. Get Access Token

the last step, use the $CLIENT_ID and $CLIENT_SECRET from step 1, $CODE from step 2 to replace the shell command below

curl -d client_id=$CLIENT_ID -d client_secret=$CLIENT_SECRET -d grant_type=authorization_code -d code=$CODE -d redirect_uri=http://localhost:3000 https://accounts.spotify.com/api/token

after run it at your terminal, you'll get your ${REFRESH_TOKEN}

the output may like this:

{
    "access_token": "BQBi-jz.....yCVzcl",
    "token_type": "Bearer",
    "expires_in": 3600,
    "refresh_token": "AQCBvdy70gtKvnrVIxe...",
    "scope": "user-read-currently-playing user-top-read"
}

if the response not return refresh_token, back to step 2 and retry.