About JWT Decoder
JWT Decoder decodes and inspects JSON Web Token headers, payloads, claims, and expiration timestamps without transmitting secrets to any server.
Key Capabilities & Features
Decodes Header and Payload JSON structures instantly
Converts exp (expiration) and iat (issued at) timestamps to human-readable dates
Highlights token expiration status (active vs expired)
100% client-side privacy guarantee for sensitive auth tokens
How to Use JWT Decoder
- 01
Paste encoded JWT
Paste a Bearer or raw JWT string into the input box.
- 02
Inspect claims
Review decoded header, payload claims, and expiry dates.
100% In-Browser Privacy Guarantee
All operations in JWT Decoder run locally in your web browser using HTML5, Web Cryptography, and WebAssembly APIs. Your text, files, credentials, and code never leave your computer.
Frequently Asked Questions
Is it safe to paste production JWTs into Toolkita?
Yes. Toolkita processes JWTs 100% locally in your browser. No tokens or payloads are logged or transmitted.