This is the audio exerpt of j spoken within a word. It may sound a little short or unclear, but that's exactly how it's in the real context. For more details, read the below explanation of pronunciation and listen example words that contain j by pressing the word buttons.
1. Break the airflow by touching your soft palate with the middle of your tongue.
2. During the interruption allow some air to pass.
3. Vibrate your vocal cords.