API Key
A unique string that authenticates your app when it calls an API, like a password that identifies who's making the request.
What is API Key?
An API key is a unique string of characters that authenticates your application when it makes requests to an API.
Think of it like a password that identifies your app to the service you're calling. The API provider generates it, you include it in your requests (usually in headers or query parameters), and the server checks it before sending back data.
Most builders use API keys to connect their apps to services like OpenAI, Stripe, or SendGrid. The key lets the provider track your usage, enforce rate limits, and bill you correctly.
Keep your keys secret. Store them in environment variables, never commit them to GitHub, and rotate them if they leak. Most services offer different keys for development and production.
Good to Know
Unique identifier that authenticates your app when calling an API
Usually passed in request headers or query parameters
Lets providers track usage, enforce limits, and bill correctly
Should be stored in environment variables, never hardcoded
Less secure than OAuth tokens but simpler for server-to-server calls
How Vibe Coders Use API Key
Connecting your app to OpenAI's API to add AI features
Setting up payment processing with Stripe in your SaaS
Sending transactional emails through SendGrid or Resend
Pulling data from Google Maps or weather APIs into your dashboard
Frequently Asked Questions
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