Configure JWT
Signature Verification Parameters
Encoded Token
Awaiting valid configuration parameters...
Color Legend
Header
Specifies token metadata like algorithm (alg) and type (typ).
Payload
Contains application claims (sub, exp, etc.) and custom variables.
Signature
Cryptographic signature ensuring contents have not been tampered with.
About the JWT Encoder
A JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. The claims in a JWT are encoded as a JSON object that is digitally signed using JSON Web Signature (JWS).
Our Online JWT Encoder allows you to build custom JSON tokens, configure metadata headers, and sign your values using industry standard cryptographic hash algorithms like HMAC (HS256/384/512) or RSA key pairs (RS256/384/512).
Because it utilizes the HTML5 Web Crypto API, all key pair generation and cryptographic signings are fully handled in your browser's execution thread. No secrets or private files are uploaded, keeping your configuration secure and private.
How to Use the Online JWT Encoder
Configure JWT Headers
Set the algorithm (alg) and token type (typ). Changing algorithms automatically keeps this updated.
Define JWT Payload
Edit claims like sub, iat, and exp. Use timing shortcuts to inject valid Unix expiration timestamps.
Apply Signature Secret
Use a text or Base64 secret key for HMAC, or paste/generate an RSA Private Key PEM for asymmetric algorithms.
Copy Encoded JWT
The token computes instantly in real-time. Use the copy button to grab your colored or standard token.
Common Use Cases
API Authentication Tokens: Construct custom Bearer tokens to authenticate stateless HTTP client requests against your backend services.
PieSocket WebSocket Authorization: Quickly draft auth tokens with specific channel, user, or capability scopes to test PieSocket authentication.
Single Sign-On (SSO): Mock identity tokens to verify SSO logins and test third-party integrations or user federation.
Lightweight Client Claims: Pack user preference or role metadata securely inside JWT claims to avoid round-trip database queries.
IoT Device Identity: Draft cryptographic assertions for edge hardware using compact, low-overhead public-private key signatures.
Why Choose Our JWT Encoder
100% Client-Side Cryptography
All signatures, key generations, and Base64 translations run in your browser. No keys ever reach our servers.
RSA Private/Public Key Generator
Generate production-ready 2048-bit RSASSA-PKCS1-v1_5 key pairs in PEM formats with a single click.
Interactive Color-Coded Sections
Clear visual tracking where parts of your raw input map to the dots and strings of the encoded token.
Smart Unix Claim Helpers
Instantly format iat (issued at) and exp (expires) claims with time-offset presets (+1 hour, +1 day, etc.).
Validation & Auto-Formatting
Real-time JSON syntax checks catch typos immediately. One-button auto-prettify makes your payloads readable.
One-Click Copy
Easily capture your final, signed JWT or the generated public/private keys with toast feedback.