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Connect JWT Decoder Verifier to ChatGPT, Claude and Gemini

Set it up once and it works in ChatGPT, Claude, Cursor, and any other client you love. It all runs safely in the background, so you can relax and focus on what really matters. Verify cryptographic signatures and decode claims instantly.

Ask AI about this Connector

Developed, maintained, and hosted by Vinkius.

MCP VERIFIED · PRODUCTION READY · VINKIUS GUARANTEED

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Works with modern AI clients that support MCP, including ChatGPT, Claude, Cursor, and more.

ChatGPTClaudeCursorPerplexityGeminiMicrosoft CopilotRaycastMeta AI

Your AI does the work. We keep it safe and sound.

No other AI tool gives you this. Your workflow runs in the client you already love, your account stays protected, and you decide what the agent can and cannot do. It is the whole reason to make the switch.

Each Connector lives inside our infrastructure, the same place where your workflow runs. The three things below are already part of it, working quietly in the background so you never have to think about them. Nothing to add, nothing to set up, nothing to worry about.

A futuristic MCP client docking bay
V8 Isolate01

Each Connector runs inside its own sealed environment.

Each Connector runs inside its own sealed V8 runtime — no access to your files, your system, or other servers. A Connector never sees past its own request.

Kill Switch02

One switch stops every agent. Instantly.

One action deactivates every Connector, revokes every token, and ends every session at once. AI Governance keeps the record.

FinOps per User03

Spending limits that pause instead of surprise.

Every user keeps their own connections and credentials, isolated from everyone else. Anything that would cross your spending limit is held for your approval, not billed.

Three controls, built into the layer your AI connects through.

Curated set · 1 capability

We ship only the actions that matter.

Capability set01 / 01

01

1 capability in this set.

Part of 1 available through JSON Web Token.

  1. 01

    Decode jwt

    This capability decodes JSON Web Tokens and performs offline cryptographic signature verification. You provide the JWT string along with a secret or public key to validate the header, payload, and signature.

Real work

What teams actually run

01

Debugging Auth Flows

You give the agent a token from a failed login attempt to see why the signature or expiration is invalid.

02

Security Auditing

You use the agent to scan a list of tokens to ensure they all match your master secret key.

03

Permission Verification

The agent inspects the payload of a token to confirm a user has the correct role for a specific API call.

04

Automated Testing

You instruct your agent to generate test cases for expired or malformed tokens to verify system resilience.

Automate a task

Put JSON Web Token to work on one thing.

Step-by-step automations your AI runs through this Connector: the workflow, the prompts to start with, and the exact capabilities behind each move.

One connector, every AI

JSON Web Token works with the most popular AI clients.

These are the most popular clients, each with a step-by-step guide: one link, set up once, with governance and visibility built in. And because everything runs on the MCP standard, the same connection also works in any other compatible client — nothing to rebuild.

ClaudeClaudeChatGPTChatGPTGeminiGeminiPerplexityPerplexityGrokGrokMicrosoft CopilotMicrosoft CopilotCursorCursorVS CodeVS CodeWindsurfWindsurfJetBrainsJetBrainsClineClineLangChainLangChainVercel AI SDKVercel AI SDKLovableLovableZ.aiZ.aiRaycastRaycastQwen CodeQwen CodeKimi CodeKimi CodeLe ChatLe Chat

Building your own app? The connector is yours to use.

You don't need a client to put JSON Web Token to work: the same hosted connection plugs into your own applications and agent code, with the same governance on every request. Build with it, chat with it — one connection for both.

Observed, not estimated

925ms average. Fast in production.

JSON Web Token is checked daily against the live service.

Daily averagePeak 1151ms
Oct 3Today
Fastest day
691ms
Slowest day
1151ms
14-day trend
Improving-7%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 1 capability arrives ready to run.

Preview access · not provider authentication

The vk_preview_* token belongs to Vinkius preview infrastructure. It lets Claude discover and display the capabilities of JSON Web Token, so you can see the experience inside your AI.

It does not authenticate your account with JSON Web Token. Actions requiring credentials or live account data may not run until you activate the Connector and authorize the service.

JSON Web Token Connector

You're all set. Choose your MCP client and follow the setup instructions.

Connector linkhttps://edge.vinkius.com/vk_preview_D5R4DSb6SK0l9HMwb0HCmTETZzhB9BBHQbV1DXPU/mcp

Claude Desktop

Follow the steps below to connect in seconds.

  1. 1In Claude Desktop, open Settings → Connectors.
  2. 2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
  3. 3Click Add and start a new chat — JSON Web Token capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "jwt-decoder-verifier-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_D5R4DSb6SK0l9HMwb0HCmTETZzhB9BBHQbV1DXPU/mcp"
    }
  }
}
  • Claude
  • ChatGPT
  • Cursor
  • VS Code
  • Windsurf
  • Claude Code
  • JetBrains
  • Cline

Step-by-step instructions for each client are in the guide. How to connect

Guided setup for Claude? Set up JSON Web Token in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work JSON Web Token owners hand off.

This MCP is built for developers and security engineers who need to validate authentication flows within their AI-assisted workflows.

  • 01

    Backend Developers

    They hand off raw JWT strings to the agent to debug authentication logic.

  • 02

    Security Engineers

    They use the agent to verify that tokens in logs or traffic are cryptographically sound.

  • 03

    QA Engineers

    They task the agent with testing token expiration and signature mismatch scenarios.

FAQ

Questions JSON Web Token owners ask.

  • 01

    Can my AI agent verify JWTs without this MCP?

    No. While an agent can decode the base64 text to read claims, it cannot perform the mathematical cryptographic signature verification required to prove a token is authentic.

  • 02

    Does this require an internet connection to verify tokens?

    No. This MCP performs all decoding and mathematical verification locally using the V8 engine.

  • 03

    What happens if the signature is invalid?

    The capability will return a verification error, allowing your agent to know the token is forged or incorrect.

  • 04

    Which clients can use this MCP?

    You can use this with any MCP-compatible client, including Claude, Cursor, Windsurf, and VS Code.

  • 05

    Can I use this to check if a token has expired?

    Yes. The capability decodes the expiration claims, and the agent can then report if the token is no longer valid.

  • 06

    Can I decode a token without the secret?

    Yes, if you omit the secret, it will only decode the payload, but it will not verify authenticity.

  • 07

    Does it check expiration dates?

    Yes, if the secret is provided, it will automatically throw an error if the token is expired.

  • 08

    What algorithms does it support?

    It supports standard JWT algorithms including HS256, HS384, and HS512.

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