Can I use this to generate API keys?

Yes. For API keys, use a length of 32–64 characters with uppercase, lowercase, and digits enabled. The cryptographic randomness source makes these suitable for security tokens.

What does 'Symbols' include?

The symbols set includes: ! @ # $ % ^ & * ( ) - _ = + [ ] { } | ; : , . ?

Random String Generator — Cryptographically Secure Tokens and Keys

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