How to use
- 1Click Generate.
- 2See the key in standard format.
- 3Copy it for your tests.
About
Generates fictional API keys in standard format for integration testing, with no link to a real service.
How to generate API keys for testing
The UtilNexo API key generator creates fictional keys in the common service format (prefix + random sequence), to test integrations, document examples, and simulate authentication without using real keys.
Real API keys often have an identifying prefix (like "sk_" for Stripe or "pk_" for public keys) followed by a random sequence. The tool replicates this format to create realistic examples.
The generated keys are fictional and do not work on any real service. They serve to fill test fields, create mocks, and illustrate documentation without exposing real credentials.
All processing is local, with cryptographically secure randomness. You can choose the format, prefix, and length of the key.
Examples
- Key with prefix "sk_" → "sk_live_51Hx... (prefix + random sequence)".
- Key without prefix → a random hexadecimal or base64 sequence.
Limitations
- The keys are fictional and do not authenticate with any service; using them in production will result in an authentication error.
- Never generate or store real keys in code. Real keys should live in environment variables or secret vaults.
How to use the API key generator
- 1Choose the format and, if desired, a prefix.
- 2Click Generate.
- 3Copy the key for tests and documentation.
Frequently asked questions
Does the generated key actually work?
No. It is fictional and does not authenticate with any service, serving only for tests and examples.
Can I use it as a real key?
No. Real keys must be generated in the service dashboard and stored securely.
What is an API key prefix?
It is an initial part that identifies the key type, like "sk_" for secret keys or "pk_" for public keys, common in services like Stripe.