Secure API Token Management: Best Practices for Generating Keys

API tokens and keys are the credentials that allow applications to communicate with your databases, microservices, and third-party APIs. If a key is leaked or compromised, unauthorized users can access your data and services, leading to data breaches or unexpected API bills.

Let's look at the best practices for generating and managing API tokens.

Generate High-Entropy Keys

An API key should be impossible to guess. Never use simple, predictable phrases:

• Use cryptographically secure pseudorandom number generators (CSPRNG) to generate keys.
• Ensure keys are long enough (typically 32 to 64 characters) to resist brute-force attacks.
• Add descriptive prefixes (e.g., sk_live_ or pk_test_) to help identify key scopes in code audits.

Secure Storage and Rotation

Once generated, protect your keys by following these guidelines:

• Environment Variables: Store keys in environment files (.env), never hardcoded in your source files.
• Rotate Regularly: Schedule regular key rotations to limit the impact of a potential compromise.
• Least Privilege: Limit the permissions of each key to only what is necessary.

Use our offline Password Generator to generate random, high-entropy tokens secure from network snooping.