Dev
Random API Key Generator
Used by developers, writers, and creators worldwide.
A random API key generator helps developers create realistic placeholder keys for testing, documentation, and local development — without touching real credentials. Instead of hardcoding `XXXXXXXX` or accidentally leaking live secrets, you get properly formatted keys that match the length and structure your code expects. Choose from five formats: hex-32, hex-64, alphanumeric-32, prefixed (with a custom prefix), or Stripe-style `sk_test_` keys. Generate up to a batch at a time and drop them straight into fixtures, environment files, or tutorial repos. It solves a small but real problem: fake keys that look fake break things; fake keys that look real let you test with confidence.
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How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Set the Number of Keys field to how many API keys you want generated in one batch.
- Choose a Key Format from the dropdown: prefixed for Stripe-style keys, hex for AWS-style tokens, or alphanumeric for generic use.
- Click Generate to produce your keys instantly in the output panel.
- Click any individual key to copy it, or copy the full list to paste into your .env file, Postman environment, or documentation.
Use Cases
- •Seeding a staging Postgres database with unique per-user API keys using a Jest beforeAll fixture script
- •Populating Postman environment variables with hex-64 placeholders during early API prototyping
- •Testing prefix-detection middleware by generating batches of Stripe-style sk_test_ keys before the real integration is wired up
- •Writing GitHub tutorial code that shows realistic key examples without exposing any live credentials
- •Fuzzing API key validation regex across 30+ alphanumeric and hex keys to confirm your pattern handles all expected formats
Tips
- →Use the prefixed format when your middleware reads the key prefix to decide env or permission level — realistic prefixes stress-test that logic.
- →Generate 10-20 alphanumeric keys at once and paste them as fixture data in your test suite so each test user gets a distinct, realistic-looking key.
- →If your docs show multiple API calls, use one batch of prefixed keys throughout so examples look like they belong to the same account.
- →Pair generated hex keys with a fake UUID generator to build complete mock authentication payloads for Postman collections.
- →Avoid using the same placeholder key in both your README examples and your actual test fixtures — someone may copy the README value and wonder why it fails.
- →When mocking third-party SDKs locally, match the key length and prefix of the real service so SDK validation helpers don't reject the placeholder before your code even runs.
FAQ
can i safely commit these fake api keys to a public github repo
Yes — these keys aren't registered with any service, so committing them carries no security risk. Add a comment labeling them as placeholders so future contributors don't mistake them for real credentials.
what's the difference between hex and alphanumeric formats for api keys
Hex keys use only 0-9 and a-f, matching patterns from AWS, many OAuth providers, and Git commit hashes. Alphanumeric keys include uppercase letters, giving more entropy per character — useful when your validation logic doesn't enforce strict hex input.
are these api keys safe to use in production
No — they're generated in the browser and aren't backed by a secure registry, so they're suitable for testing only. For production secrets, use a server-side source like Node's crypto.randomBytes or a dedicated secrets manager.