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Showing content from https://developer.spotify.com/documentation/web-api/tutorials/code-flow below:

Authorization Code Flow | Spotify for Developers

Authorization Code Flow

The authorization code flow is suitable for long-running applications (e.g. web and mobile apps) where the user grants permission only once.

If you’re using the authorization code flow in a mobile app, or any other type of application where the client secret can't be safely stored, then you should use the PKCE extension. Keep reading to learn how to correctly implement it.

The following diagram shows how the authorization code flow works:

Pre-requisites

This guide assumes that:

You have read the authorization guide.
You have created an app following the apps guide.

Example

You can find an example app implementing Authorization Code flow on GitHub in the web-api-examples repository.

The first step is to request authorization from the user so that our app can access to the Spotify resources on the user's behalf. To do this, our application must build and send a GET request to the /authorize endpoint with the following parameters:

Query Parameter Relevance Value client_id Required The Client ID generated after registering your application. response_type Required Set to code. redirect_uri Required The URI to redirect to after the user grants or denies permission. This URI needs to have been entered in the Redirect URI allowlist that you specified when you registered your application (See the app guide). The value of redirect_uri here must exactly match one of the values you entered when you registered your application, including upper or lowercase, terminating slashes, and such. state Optional, but strongly recommended This provides protection against attacks such as cross-site request forgery. See RFC-6749. scope Optional A space-separated list of scopes.If no scopes are specified, authorization will be granted only to access publicly available information: that is, only information normally visible in the Spotify desktop, web, and mobile players. show_dialog Optional Whether or not to force the user to approve the app again if they’ve already done so. If false (default), a user who has already approved the application may be automatically redirected to the URI specified by redirect_uri. If true, the user will not be automatically redirected and will have to approve the app again.

The following JavaScript code example implements the /login method using Express framework to initiates the authorization request:


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 var client_id = 'CLIENT_ID';
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 var redirect_uri = 'http://127.0.0.1:8888/callback';
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 app.get('/login', function(req, res) {
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  var state = generateRandomString(16);
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  var scope = 'user-read-private user-read-email';
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  res.redirect('https://accounts.spotify.com/authorize?' +
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  querystring.stringify({
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  response_type: 'code',
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  client_id: client_id,
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  redirect_uri: redirect_uri,

Once the request is processed, the user will see the authorization dialog asking to authorize access within the user-read-private and user-read-email scopes.

The Spotify OAuth 2.0 service presents details of the scopes for which access is being sought. If the user is not logged in, they are prompted to do so using their Spotify credentials. When the user is logged in, they are asked to authorize access to the data sets or features defined in the scopes.

Finally, the user is redirected back to your specified redirect_uri. After the user accepts, or denies your request, the Spotify OAuth 2.0 service redirects the user back to your redirect_uri. In this example, the redirect address is https://127.0.0.1:8888/callback

Response

If the user accepts your request, then the user is redirected back to the application using the redirect_uri passed on the authorized request described above.

The callback contains two query parameters:

Query Parameter Value code An authorization code that can be exchanged for an access token. state The value of the state parameter supplied in the request.

For example:


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 https://my-domain.com/callback?code=NApCCg..BkWtQ&state=34fFs29kd09

If the user does not accept your request or if an error has occurred, the response query string contains the following parameters:

Query Parameter Value error The reason authorization failed, for example: "access_denied" state The value of the state parameter supplied in the request.

For example:


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 https://my-domain.com/callback?error=access_denied&state=34fFs29kd09

In both cases, your app should compare the state parameter that it received in the redirection URI with the state parameter it originally provided to Spotify in the authorization URI. If there is a mismatch then your app should reject the request and stop the authentication flow.

Request an access token

If the user accepted your request, then your app is ready to exchange the authorization code for an access token. It can do this by sending a POST request to the /api/token endpoint.

The body of this POST request must contain the following parameters encoded in application/x-www-form-urlencoded:

Body Parameters Relevance Value grant_type Required This field must contain the value "authorization_code". code Required The authorization code returned from the previous request. redirect_uri Required This parameter is used for validation only (there is no actual redirection). The value of this parameter must exactly match the value of redirect_uri supplied when requesting the authorization code.

The request must include the following HTTP headers:

Header Parameter Relevance Value Authorization Required Base 64 encoded string that contains the client ID and client secret key. The field must have the format: Authorization: Basic <base64 encoded client_id:client_secret> Content-Type Required Set to application/x-www-form-urlencoded.

This step is usually implemented within the callback described on the request of the previous steps:


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 app.get('/callback', function(req, res) {
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  var code = req.query.code || null;
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  var state = req.query.state || null;
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  if (state === null) {
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  querystring.stringify({
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  error: 'state_mismatch'
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  url: 'https://accounts.spotify.com/api/token',
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  redirect_uri: redirect_uri,
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  grant_type: 'authorization_code'
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  'content-type': 'application/x-www-form-urlencoded',
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  'Authorization': 'Basic ' + (new Buffer.from(client_id + ':' + client_secret).toString('base64'))

Response

On success, the response will have a 200 OK status and the following JSON data in the response body:

key Type Description access_token string An access token that can be provided in subsequent calls, for example to Spotify Web API services. token_type string How the access token may be used: always "Bearer". scope string A space-separated list of scopes which have been granted for this access_token expires_in int The time period (in seconds) for which the access token is valid. refresh_token string See refreshing tokens.

What's next?

Congratulations! Your fresh access token is ready to be used! How can we make API calls with it? take a look at to the access token guide to learn how to make an API call using your new fresh access token.
If your access token has expired, you can learn how to issue a new one without requiring users to reauthorize your application by reading the refresh token guide.

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