Refreshing the access token PKCE Flow

[Ulrick1432]

Country

Denmark (DK)

Device

Desktop

Operating System

Windows 10

My Question or Issue

I am trying to do a post request for a new access token / refresh the access token with this JS code:

const refreshAccessToken = async () => {

  const refreshToken = localStorage.getItem('refresh_token');

  try {

    const body = new URLSearchParams({

      grant_type: 'refresh_token',

      refresh_token: refreshToken,

      client_id: clientId,

      client_secret: client_Secret

    }).toString();

    const response = await fetch('https://accounts.spotify.com/api/token', {

      method: 'POST',

      headers: {

        'Content-Type': 'application/x-www-form-urlencoded'

      },

      body: body

    });

      if (!response.ok) {

        throw new Error('HTTP status ' + response.status);

      }

      const data = await response.json();

      localStorage.setItem('access_token', data.access_token);

  } catch (error) {

    console.error('Error refreshing access token:', error);

  }

};

but im getting this Error: HTTP status 400 so something in this part of the code must be wrong: 

const body = new URLSearchParams({

      grant_type: 'refresh_token',

      refresh_token: refreshToken,

      client_id: clientId,

      client_secret: client_Secret

    }).toString();

    const response = await fetch('https://accounts.spotify.com/api/token', {

      method: 'POST',

      headers: {

        'Content-Type': 'application/x-www-form-urlencoded'

      },

      body: body

    });

can't find the problem... 

i appreciate the help! 

[Prague]

Howldy Ulrick1432! 
It looks like you're on the right track, but there might be an issue with the parameters you're sending in your POST request. Double-check that your `refreshToken`, `clientId`, and `client_Secret` values are correct and not empty. Also, ensure that the `Content-Type` header is set correctly as `'application/x-www-form-urlencoded'`. If all the values are accurate and you’re still encountering issues, let me know and we’ll work this out.

Not to be hounding you.. but keep me in the loop!

-Prague the Dog