Developer Tools
JWT Encoder
Create valid JWTs instantly. Edit header and payload as JSON, choose algorithm (HS256, HS384, HS512), enter secret, and generate a properly signed token. Live preview and validation included. All done locally in your browser.
Signing uses the Web Crypto API (HMAC). No data is sent to any server.
Creating JWTs During Development
JWTs are everywhere in modern APIs and single-page applications. Being able to quickly craft a token with specific claims (exp, sub, roles, etc.) is invaluable when testing authorization logic, mocking user sessions, or debugging why a token is being rejected.
Security Note
Only use this tool with secrets you are comfortable exposing in a browser tab. For real production tokens, always generate them on a secure backend using environment variables and proper key management. This encoder is intended for development, testing, and learning.
Related Developer Tools
- JWT Decoder (the companion tool)
- Hash Generator