API Key Hasher — Secure Storage Tool
Hash API keys using SHA-256, SHA-512, or PBKDF2 before storing them in your database. Generates a Node.js verification snippet and shows the recommended storage format — all 100% client-side using the Web Crypto API.
How to Use API Key Hasher — Secure Storage Tool
How to Use the API Key Hasher
Step 1: Paste Your API Key
Enter or paste the API key you want to hash. Use the eye icon to toggle visibility. You can also click an example preset to test with a realistic-looking key.
Step 2: Choose an Algorithm
| Algorithm | Speed | Output | Best for |
|---|---|---|---|
| SHA-256 | Fast | 64 hex chars | Checksums, lookup indices, low-risk keys |
| SHA-512 | Fast | 128 hex chars | Longer keys, signing secrets, higher security |
| PBKDF2 | Slow (safe) | 64 hex chars | Credentials needing offline attack protection |
SHA-256 and SHA-512 are fast cryptographic hash functions. They are suitable when your main threat model is a database breach exposing stored keys, and the keys themselves have high entropy (randomly generated). They do not protect against GPU-based brute-force attacks if the key has low entropy.
PBKDF2 applies 100,000 iterations of HMAC-SHA256 to derive the hash. The high iteration count makes GPU cracking prohibitively expensive, similar to how bcrypt protects passwords. Use PBKDF2 when the API key might be reused as a password or when your keys have lower entropy.
Step 3: Add a Salt (Optional for SHA, Auto-generated for PBKDF2)
A salt is a random value mixed into the input before hashing. It prevents two identical keys from producing the same hash and defeats precomputed rainbow table attacks.
- For SHA-256 and SHA-512, the salt is optional. If provided, the tool hashes
salt:apiKeyand you store the salt separately. - For PBKDF2, a salt is mandatory. If you leave the field blank, the tool generates a cryptographically random 16-byte salt automatically.
Step 4: Click Hash Key
The tool outputs:
- The raw hex hash
- The full stored record string (algorithm prefix + salt + hash)
- A Node.js verification snippet using
timingSafeEqual
Step 5: Store and Verify
Store the hash in your database, never the original key. When a user presents a key for authentication, hash it with the same algorithm and salt, then compare using timingSafeEqual to prevent timing attacks.
Storage Format Reference
| Algorithm | Format |
|---|---|
| SHA-256 (no salt) | sha256:hexHash |
| SHA-256 (with salt) | sha256:salt:hexHash |
| SHA-512 (no salt) | sha512:hexHash |
| SHA-512 (with salt) | sha512:salt:hexHash |
| PBKDF2 | pbkdf2:100000:saltHex:hashHex |
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