Env Files and Environment Variables for Voice AI Projects

A guide on using .env files and environment configuration in voice AI projects, covering dotenv setup for Node.js and Python, adding .env to .gitignore, and Vapi-specific keys like VAPI_API_KEY and VAPI_PROJECT_ID. It cites GitGuardian's finding of 12.8 million secrets leaked on GitHub in 2023, a 28% increase, and recommends separate env files per environment plus tools such as git-crypt, SOPS, AWS Secrets Manager and HashiCorp Vault.