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Advanced Topic 39 of 51 Web Development

OAuth 2.0

Delegated authorization framework.

How it works

OAuth lets an app obtain limited access to a user's resources via an authorization server, using flows like Authorization Code + PKCE to get access tokens with scopes.

Where it is used

"Sign in with Google", API access.

Common pitfall

OAuth is authorization, not authentication; use OpenID Connect for identity.

Where it fits in the course

OAuth 2.0 is topic 39 of 51 in Web Development, rated Advanced. It follows JWT. The next topic is CORS.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the Web Development quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is OAuth 2.0?
Delegated authorization framework. It belongs to Web Development and is an advanced-level topic.
Where do people use OAuth 2.0?
"Sign in with Google", API access.
What is the most common mistake with OAuth 2.0?
OAuth is authorization, not authentication; use OpenID Connect for identity.
What should I learn before this topic?
Start with JWT, the topic just before it in Web Development.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Web Development quiz.
Is OAuth 2.0 hard to learn?
It is an Advanced topic. Expect to read the explanation more than once and to connect it with earlier topics. Working through a small example by hand helps most.
How long does it take to learn OAuth 2.0?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to OAuth 2.0?
JWT, CORS, Authentication Flows are closely connected. The full list is in the related topics section of this page.
What should I study after OAuth 2.0?
Continue with CORS, the next topic in Web Development.

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