WebCrypto HMAC
JWT Mock Token Generator & Signer
Generate cryptographically signed JWT tokens for local API development and testing. Color-coded header, payload, and signature inspection.
JWT Mock Token Generator & SignerHS256 WebCrypto
Generate signed JSON Web Tokens for local development, API mocking, and auth testing. 100% in-browser cryptographic signing.
Signing Algorithm:
Payload Claims (JSON)
Exp:
Encoded JWT Token
Header.Payload.Signature
Invalid payload
Token Meta:
Algorithm: HS256
Type: JWT
Status: Cryptographically Valid
Storage: Local Only
HS256, HS384, HS512 Algorithms
1-Click Expiration Helpers (+24h)
Color-Coded Token Breakdown
Copy Bearer Header Ready
How to Use JWT Mock Token Generator & Signer (HS256/384/512) (Step-by-Step Guide)
No software installation required. Complete your task in 3 easy steps directly in your browser.
1
Choose Algorithm & Secret
Select HS256, HS384, HS512 or none, and set your secret key.
2
Configure Payload Claims
Edit JSON claims (sub, name, email, role) with quick +1h / +24h expiration helpers.
3
Copy Token or Bearer Header
1-click copy the signed JWT token for use in Postman, curl, or HTTP headers.
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Got Questions?
Frequently Asked Questions
Never. Signing is performed strictly in your browser via the native WebCrypto API.