References

Obtaining YouTube Stream Data

GET YouTube URL 2. In the HTML response, locate the streamingData JSON object 3. See var ytInitialResponse = {responseContext... 3. The streamingData object contains an array of formats 4. Each format entry describes a download stream 5. There is also an adaptiveFormats array, which contains the same information as formats, but for adaptive streams 6. In the format objects, search for audio/mp4 streams and find the one with the highest audioQuality

Google

Google Dewveloper Console

YouTube

Other