About JWT Toolkit
JWT Toolkit is a comprehensive, free online suite for working with JSON Web Tokens — decoding, validating, inspecting and analyzing them with a focus on privacy and security.
What is JWT Toolkit?
JWT Toolkit provides twelve specialized utilities for developers who work with JSON Web Tokens: a decoder, inspector, expiry checker, signature verifier, claims viewer, header viewer, payload formatter, timestamp converter, lifetime calculator, audience validator, secret strength checker and a Base64URL decoder.
Key Features
- 12 specialized JWT tools for comprehensive token analysis
- Browser-only processing — your tokens never leave your device
- No registration or account required
- Support for HS256, HS384 and HS512 signature verification
- Real-time token validation and expiry checking
- Modern interface with light and dark mode
Privacy First
All JWT processing happens entirely in your browser using JavaScript. We do not send your tokens to any server, store them in any database or track your usage. Your sensitive data remains completely private on your device.
Free Forever
JWT Toolkit is completely free to use with no limitations. If you find it helpful, you can support the project to help maintain and improve the service.
JWT Tools
- JWT DecoderDecode JWT tokens to view header and payload
- JWT InspectorComprehensive analysis of JWT token structure and claims
- JWT Expiry CheckerCheck if JWT token is expired and view time remaining
- JWT Signature VerifierVerify JWT signature with secret or public key
- JWT Claims ViewerView all JWT claims in a tree-style format
- JWT Header ViewerDisplay JWT header information only
- JWT Payload FormatterPretty print JWT payload with proper indentation
- JWT Timestamp ConverterConvert JWT timestamps to readable dates
- JWT Lifetime CalculatorCalculate JWT token lifetime duration
- JWT Audience ValidatorValidate JWT audience claim against expected value
- JWT Secret Strength CheckerAnalyze JWT secret strength and security
- Base64URL DecoderDecode Base64URL encoded strings