How do I authenticate with AI APIs?

Most AI APIs use API keys passed in the Authorization header. OpenAI uses Bearer tokens, Anthropic uses x-api-key headers, and Google uses OAuth2 or API keys.

How should I store API keys in production?

Never hardcode API keys. Use environment variables, server-side only, with a secrets manager for production. Rotate keys periodically and use separate keys for development and production.

Can I use AI APIs without exposing keys?

Yes, by routing all AI API calls through your backend server. The client communicates with your server, which holds the API key and forwards requests to the AI provider.

The Complete Guide to AI API Authentication (2026)

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