discogs_request_token.js

const discogs = {
  oauth_consumer_key: "xxxxx",
  oauth_signature: "xxxxx",
}

const Auth = `OAuth 
  oauth_consumer_key="${discogs.consumer_key}",
  # notice the ampersand after the consumer secret:
  oauth_signature="${discogs.consumer_secret}&",
  oauth_nonce="${Date.now()}",
  oauth_signature_method="PLAINTEXT",
  oauth_timestamp="${Date.now()}",
`.replace(/\n/g, '');

fetch('https://api.discogs.com/oauth/request_token', {
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded',
    'Authorization': Auth,
  },
  method: 'GET',
})