Introduction to AI APIs

Relax. We'll talk through this in plain words — no textbook voice.

What you'll walk away with

Understand Introduction to AI APIs without the intimidation factor
Get hands-on practice trying it yourself
Spot the common pitfalls and sidestep them with a smile

Learn the basics of an AI API's request/response cycle, models, API keys, and server-side architecture.

Let's think about it this way for a moment

An AI API is the door through which your application sends an HTTPS request to a model service and gets a result back. The request carries the model and the input; the response carries the output and metadata. An API key is a secret credential that can rack up charges, so it should never live in browser code.

Introduction to AI APIs lesson illustration — AI APIs — Introduction to AI APIs

Let's connect this to everyday life

The correct flow is Browser → your backend → AI provider. On the backend you validate input, check authentication, apply rate limits, read the API key from an environment variable, and then call the provider.

Keep the API key in a server-side environment variable
Validate and limit user input
Handle errors, timeouts, and rate limits

Let's try it hands-on together

text

Browser
  ↓ POST /api/ask
Your server (validates + holds API key)
  ↓ HTTPS request
AI API
  ↓ response
Your server → Browser

You should see

You'll be able to sketch and explain a secure AI API architecture.

5-minute try-it

Draft a rough JSON for a chat feature's request body, response body, and three possible errors.

A quick word of caution

Don't treat AI output as the final, guaranteed-correct answer. For anything important — critical facts, code, or user data — have a human review it before you use it.

OpenAI API Quickstart — OpenAI

Easy traps

Putting an API key into frontend JavaScript
Not limiting the length of user input

Exercise

Draft a rough JSON for a chat feature's request body, response body, and three possible errors.

You'll know it worked when: You'll be able to sketch and explain a secure AI API architecture.