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Connect JWT Base64 Decoder 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. Get exact token data without LLM guesswork.

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 · 2 capabilities

We ship only the actions that matter.

Capability set01 / 01

01-02

2 capabilities in this set.

Part of 2 available through JWT Decoder.

  1. 01

    Decode base64 string

    This capability converts any Base64 string into plain UTF-8 text. It provides a deterministic way to read encoded data without signature verification.

  2. 02

    Decode jwt token

    This capability parses raw JWT tokens to extract the header and payload. It also calculates the exact expiration date from the token data.

Real work

What teams actually run

01

Auth Debugging

Paste a Bearer token into your AI client to see exactly what claims are inside.

02

API Response Inspection

Send raw Base64 payloads from an API response to the agent for immediate parsing.

03

Token Expiry Checks

Verify if a specific token has expired by having the agent calculate the timestamp.

04

Payload Validation

Compare the decoded JSON payload against your expected schema.

Automate a task

Put JWT Decoder 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

JWT Decoder 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 JWT Decoder 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

987ms average. Fast in production.

JWT Decoder is checked daily against the live service.

Daily averagePeak 1241ms
Oct 3Today
Fastest day
777ms
Slowest day
1241ms
14-day trend
Stable0%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 2 capabilities arrive 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 JWT Decoder, so you can see the experience inside your AI.

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

JWT Decoder Connector

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

Connector linkhttps://edge.vinkius.com/vk_preview_JtisWyM2L8SwCbAosdXvoaNUkIeJdtsNTEISeftK/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 — JWT Decoder capabilities are ready to use.
Configuration · claude_desktop_config.jsonCopy
{
  "mcpServers": {
    "jwt-base64-decoder-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_JtisWyM2L8SwCbAosdXvoaNUkIeJdtsNTEISeftK/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 JWT Decoder in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work JWT Decoder owners hand off.

This is built for developers and security engineers who need to inspect authentication data quickly.

  • 01

    Backend Engineer

    Hands off raw auth headers to the AI to debug session issues.

  • 02

    Security Researcher

    Uses the MCP to inspect token claims and expiration logic.

  • 03

    QA Engineer

    Provides encoded API responses to the agent for payload validation.

FAQ

Questions JWT Decoder owners ask.

  • 01

    Does this MCP verify JWT signatures?

    No, this MCP is designed for decoding and inspecting the contents of tokens, not for verifying their cryptographic signatures.

  • 02

    How does it handle expiration dates?

    The decode_jwt_token capability extracts the expiration claim and calculates the exact date for you.

  • 03

    Can I use this with Claude?

    Yes, you can connect this MCP to any compatible client like Claude, Cursor, or Windsurf through Vinkius.

  • 04

    Is the decoding accurate?

    Yes, it uses native Node buffers to ensure the decoding is deterministic and precise.

  • 05

    What kind of data can it decode?

    It handles both standard Base64 strings and JWT tokens.

  • 06

    Is it secure?

    Yes, decoding runs completely local.

  • 07

    Does it verify the JWT signature?

    No, this is a strict decoder for reading payloads, not an authentication gateway.

  • 08

    Can it decode hex as well?

    It is specialized in Base64 and JWT headers/payloads.

Explore

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