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JWT Decoder & Inspector
100% In-Browser Execution
Security Notice: Decoding only unpacks base64url data and does NOT verify signature authenticity. Never trust unverified client-side tokens for sensitive backend authorization. Adyve DevTools never transmits or stores your token.
Encoded JWT Token
Tool Documentation, Shortcuts & FAQs
How to Use JWT Decoder & Inspector
- 1Paste your raw Bearer or JWT token into the input area.
- 2The tool immediately parses the three token segments (Header, Payload, Signature).
- 3Check the Expiration status banner to see if the token is active or expired.
- 4Inspect standard claims like sub, iss, aud, exp, and custom application metadata.
Key Capabilities
100% Client-Side Privacy
Your tokens are decoded strictly in your local browser memory. They are never transmitted over the network or logged.
Automatic Expiration & Status Check
Inspects 'exp', 'iat', and 'nbf' timestamps and displays relative time (e.g., 'Expired 2 hours ago' or 'Valid for 5 days').
Header, Payload & Signature Breakdown
Color-coded breakdown separating token algorithm headers, claim payloads, and cryptographic signature segments.
Security Auditing
Automatically detects critical token vulnerabilities such as 'alg: none' bypass attacks and unsigned credentials.
Frequently Asked Questions
No. Decoding simply extracts the base64url data so you can read its claims. To verify that a token has not been tampered with, you must verify its signature using your secret key or public certificate.
Zero Data Retention
All calculations are performed strictly in client-side memory using your browser engine. No data is ever sent across the network.