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dotenv in Node for AI Coding Tools: Safe API Key Setup for OpenAI, Anthropic, and MCP Apps

Last Updated: November 14th, 2026

Every AI key you paste into a source file is one git push away from going public. Setting up dotenv in Node takes a few minutes. dotenv is a small package that moves those keys into a local .env file, and your code reads them at runtime through process.env (Node's built-in object for environment…