title: YouTube Data API V3 unkownPart "localizations"
body: <p>I have been trying to fetch all videos from a playlist using YouTube Data API, which worked like a char; next, I wanted to try and filter videos based on languages, so I wanted to try to include the &quot;localizations&quot; part. However, whenever I do, I get a 400 response stating that &quot;localizations&quot; is &quot;unkownPart&quot;. From what I could see in the documentation, I should have my GET request structured properly:</p>
  <pre class="lang-js prettyprint-override"><code>`https://youtube.googleapis.com/youtube/v3/playlistItems?part=localizations&amp;part=snippet&amp;maxResults=${limit}&amp;playlistId=${playlistId}&amp;key=${apiKey}`
  </code></pre>
  <p>Error message in postman:</p>
  <pre class="lang-json prettyprint-override"><code>{
      &quot;error&quot;: {
          &quot;code&quot;: 400,
          &quot;message&quot;: &quot;'localizations'&quot;,
          &quot;errors&quot;: [
              {
                  &quot;message&quot;: &quot;'localizations'&quot;,
                  &quot;domain&quot;: &quot;youtube.part&quot;,
                  &quot;reason&quot;: &quot;unknownPart&quot;,
                  &quot;location&quot;: &quot;part&quot;,
                  &quot;locationType&quot;: &quot;parameter&quot;
              }
          ]
      }
  }
  </code></pre>
  <p>&quot;localizations&quot; is a direct copy from the documentation. The GET request works fine if I remove it so I'm confident that the problem is either the order or my parameters, or the combinations of parameters in use (though I couldn't find anything about incompatible parameters in the documentation).</p>
  <p>Parameters order goes as follows:</p>
  <ol>
  <li>localizations</li>
  <li>snippet</li>
  <li>playlistId</li>
  <li>key</li>
  </ol>
  <p>EDIT: link to the documentation: <a href="https://developers.google.com/youtube/v3/docs/playlists/list" rel="nofollow noreferrer">https://developers.google.com/youtube/v3/docs/playlists/list</a></p>