Security & Tokens
100% Client-Side Privacy
Instant High-Performance Output
JWT Decoder
Decode and inspect JSON Web Token header, payload claims, and expiration timestamps.
Quick Summary:
Free client-side JWT Decoder. Inspect Header and Payload claims with human-readable timestamps and zero server transmission.
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Input & Controls
0 characters
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What is JWT Decoder?
Decode JWTs (JSON Web Tokens) safely in your browser without transmitting sensitive tokens over the internet. View header algorithm, claims, issued-at, and expiry dates.
Unlike traditional online utilities that upload your sensitive payloads to a remote server, TechnoLila's JWT Decoder executes 100% locally in your web browser using modern JavaScript APIs, HTML5 Canvas, and SVG vector rendering. No barcodes, asset IDs, Wi-Fi credentials, tokens, or proprietary payloads ever leave your device.
How to Use JWT Decoder Online
Paste your encoded JWT into the token box. The header, payload, and expiry dates will be decoded and rendered automatically.
JWT Decoder Example
Example Input:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IlZpamF5IiwiYWRtaW4iOnRydWUsImlhdCI6MTUxNjIzOTAyMn0.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5cExample Output:
Header: {"alg":"HS256","typ":"JWT"}
Payload: {"sub":"1234567890","name":"Vijay","admin":true,"iat":1516239022}Common Use Cases
Debugging OAuth2 / OpenID Connect tokens, checking token expiration.
Common Mistakes & Gotchas
Confusing JWT decoding (base64url) with cryptographic signature verification.
Frequently Asked Questions
Is my secret key or token exposed?
No. The entire decoding algorithm runs strictly in your browser using pure JavaScript.
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