Search⌘ K
AI Features
Home
Courses
Grokking the Product Architecture Interview

Requirements of the YouTube API

Explore the essential functional and non-functional requirements for designing the YouTube API. Learn how to support video streaming, searching, ratings, uploads, and comments while ensuring scalability, availability, security, and low latency. This lesson guides you through key considerations needed to build an efficient, flexible, and secure streaming service API.

We'll cover the following...

Introduction to the YouTube API

YouTube is a popular service where end users can upload videos and watch videos uploaded by other channels. It has a huge repository of free-hosted videos with many additional features. YouTube provides various kinds of APIs to their users to perform different operations—for example, video searching, streaming, rating, uploading, sharing, and so on. However, the design of such APIs needs an in-depth understanding of the internal working of the system. In this chapter, we’ll learn about the workflow of the YouTube service and design API for each core operation, as discussed in the following section.

Let's start by considering the following requirements for designing the YouTube API.

Note: You might want to check the System Design: YouTube lesson to get a better idea of the API design we are going to discuss in this chapter.

Requirements

We consider the following functional and non-functional requirements that need to be met while designing the YouTube API.

Functional requirements

  • Video searching: Users should be able to search for a video through the vast repository of YouTube videos.

  • Video streaming: Users should be able to stream a video uninterruptedly.

  • Video preview: This service should allow users to obtain video trailers.

  • Rating a video: Each video needs to have a like or dislike button.

  • Video uploading: Users should be able to upload videos.

  • Comment on a video: Users should be able to add multiple comments on a video.

Non-functional requirements

For the YouTube platform to work seamlessly, the following non-functional requirements are essential:

  • Scalability: The system should be scalable to handle the ever-increasing number of users.

  • Availability: The system should be highly available to provide uninterrupted services.

  • Flexibility/adaptability: Since YouTube is a popular service, a number of devices are used to access it. This requires the API to be flexible and consistent across various devices like TVs, mobile phones, desktop computers, laptops, and so on.

  • Security: The API should allow only privileged users to manipulate their content. Furthermore, users should be able to communicate securely with the API.

  • Low latency: The system should be adaptable to changing network conditions, such as low bandwidth and occasional network congestion.

Prerequisites

We have covered some of the functional requirements in the preceding chapters. We will use those as building blocks to build the API of the YouTube service. We recommend going through the following services before continuing this chapter.

  • File upload service: The API of the upload service facilitates the uploading of user’s videos to the platform.

  • Search service: This service enables users to search through the existing video repository.

  • Comment service: This service allows users to post a comment on a platform.

You may also want to explore the Quiz on Rating API to see how users can like or dislike comments and videos.

How will we design the YouTube API?

This chapter is composed of the following lessons:

  1. Introduction to Video Streaming: This lesson discusses some important concepts and the process of video streaming.

  2. YouTube API Design Decisions: This lesson focuses on important concepts and design considerations that direct the API design for our streaming service.

  3. API Model for YouTube Service: This lesson focuses on how the API makes the services available to the users through different endpoints. It also discusses the request and response message structure.

  4. YouTube API Design Evaluation and Latency Budget: In this lesson, we describe different optimization strategies and tradeoffs that could affect the service of our API. We also estimate the latency and response time of our API.

  5. Quiz on TikTok API Design: This lesson will serve to reinforce what you have learned in the preceding lessons. We’ll challenge your understanding through a quiz on another streaming service called TikTok.

Let's start with the important technical decisions for designing the streaming API in the next lesson.