MCP For Claude Marketplace
Deterministic JWT Inspector

Deterministic JWT Inspector MCP Connector for Claude

A+

Transform your AI into a cybersecurity diagnostic tool. Instantly decode and inspect JSON Web Tokens (Headers, Payloads, and Expiry metadata) without requiring signature keys.

1 tools Official Updated Jun 28, 2026 Official Vinkius Partner
More Details Connect to Claude

Debugging authentication pipelines often requires pasting sensitive JSON Web Tokens (JWTs) into public websites like jwt.io, creating severe security risks. The JWT Inspector MCP solves this by empowering your AI agent to decode and inspect authentication tokens algorithmically from within its own secure runtime.

The Superpowers

  • Deep Payload Extraction: Automatically decodes Base64Url segments, revealing hidden user claims, roles, and session data directly to the agent's context.
  • Automated Expiry Diagnostics: Instantly calculates the exp and iat timestamps, comparing them against the exact current UTC time to alert the AI if the token is already expired.
  • Signature Bypassing: Built purely for architectural debugging. It unpacks the structure without requiring public/private RSA keys, making it universally applicable for frontend and backend analysis.
  • Zero-Dependency Architecture: Pure JS runtime execution guarantees absolute microsecond speed without pulling heavy external cryptographic libraries.
jwtsecurity-audittoken-inspectionbase64-urlauthentication-debuggingpayload-extraction

1 tools expose this connector's capabilities to your AI agent.

inspect_jwt

It does not verify the signature, so do not use it to authenticate the token, only to inspect its payload and headers. Deeply inspects and decodes a JSON Web Token (JWT), extracting the Header, Payload claims, and calculating expiry metadata without requesting verification keys

See how to talk to your AI agent using Deterministic JWT Inspector.

Can you inspect this JWT and tell me the user's roles? eyJ...

Using the inspect_jwt tool: The decoded payload reveals the user has the roles ['admin', 'editor'].

Why is my API request failing? Is this token expired?

Using the inspect_jwt tool: Yes, the metadata diagnostic shows `isExpired: true`. The token expired at 2026-05-15T12:00:00Z.

What encryption algorithm is this token using?

Using the inspect_jwt tool: The header analysis indicates the token is using the 'RS256' algorithm.

No. The JWT Inspector is strictly a structural diagnostic tool. It bypasses signature verification to allow the AI to inspect payloads and headers during development and debugging workflows. It should not be used as a backend authentication gate.

Related Connectors

BU

Bubble.io (No-code Application Platform API) MCP

8 tools Official

Manage your Bubble.io application data and trigger backend workflows directly from any AI agent.

F View details →
CA

CATS ATS MCP

8 tools Official

Manage recruitment workflows via CATS ATS — track candidates, job orders, and activities directly from any AI agent.

A+ View details →
ON

OneSky (App & Web Localization API) MCP

26 tools Official

Automate app and web localization via OneSky — manage project groups, track translation progress, and handle projects directly from your AI agent.

A+ View details →
BL

Blackbaud MCP

7 tools Official

Manage constituents, gifts, and academic data via Blackbaud — handle fundraising and education management directly from your AI agent.

A+ View details →