Your First API Call

Open your weather app and pull-to-refresh. In the half-second before the numbers update, your phone just fired a message across the internet to a server it has never met, asked it a question, and got an answer back. That round trip is an API call , and your ph

8 lessons, each with runnable code in the browser.

  1. What Even Is an API?
  2. JSON: How Data Travels
  3. API Keys and Rate Limits
  4. Call Claude and Print the Reply
  5. Request Anatomy: Endpoint, Headers, Body
  6. Reading the Full Response Object
  7. Errors, Timeouts, and Retries
  8. Keeping API Keys Safe

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