A secret code that identifies your app when making requests to an API.
An API Key is a unique identifier used to authenticate requests to an API. Think of it like a password for your application — it tells the Server who is making the request and whether they have permission.
API keys should be kept secret using environment variables, never committed to Git. They are encrypted in transit via HTTPS/SSL. API keys are a type of Token — simpler than JWTs but essential for service-to-service communication.
Supabase, Stripe, OpenAI, and most services use API keys. Edge Functions use them to authenticate Backend calls. Claude Code helps configure API keys securely in your Frontend and backend applications.
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