How to Use the JWT & Base64 Decoder MCP in VS Code Copilot

Share deterministic token decoding across your engineering team. Inspect JWTs directly inside VS Code Copilot.

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Connect JWT & Base64 Decoder MCP to VS Code Copilot

Create your Vinkius account to connect JWT & Base64 Decoder to VS Code Copilot and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup JWT & Base64 Decoder with VS Code Copilot

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VS Code Copilot MCP Server Integration

The `decode_jwt_token` tool extracts headers and payloads from JSON Web Tokens without guessing. You trigger the tool from your chat panel, and it breaks down the exact claims your application is trying to read. Expiration dates are calculated down to the second. Your agent converts the epoch timestamp into a readable format so you know exactly when a specific token died.

Exact Base64 Output

The `decode_base64_string` tool forces the agent to use standard libraries for string conversion. You feed it a Base64 string, and it hands back perfect UTF-8 text. Relying on a language model to do byte-level math creates massive security risks. This dedicated tool ensures every translation is completely deterministic.

Team-Wide Auth Tooling

You can commit this MCP server configuration to your repository. Every developer on your team gets instant access to accurate token decoding without leaving their editor. The tools inspect payloads but leave signature verification to your actual codebase. This clear separation of concerns helps your team debug claim formatting without confusing it with cryptographic validation.

Setup guide

Set up JWT & Base64 Decoder MCP in VS Code Copilot

Prerequisites

VS Code 1.99 or later with GitHub Copilot extension
Active Vinkius subscription with a valid endpoint token

1

Open MCP configuration

Open the Command Palette (Cmd+Shift+P / Ctrl+Shift+P) and run "MCP: Add Server". Select HTTP (Streamable) as the server type. VS Code will create .vscode/mcp.json in your workspace.
2

Add the JWT & Base64 Decoder MCP

Paste the JSON snippet shown on the right into your .vscode/mcp.json. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Switch to Agent mode

Open Copilot Chat (Cmd+Shift+I / Ctrl+Shift+I) and switch to Agent mode using the dropdown. MCP tools are only available in Agent mode — they do not appear in Edit or Ask modes.
4

Verify the connection

In the Copilot Chat input, type # to list available tools. You should see the JWT & Base64 Decoder tools listed. Try asking: "List my recent JWT & Base64 Decoder transactions" and Copilot will invoke them automatically.

.vscode/mcp.json

{
  "mcpServers": {
    "jwt-base64-decoder-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by JWT Decoder. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about JWT & Base64 Decoder MCP in VS Code Copilot

Create a .vscode/mcp.json file in your repository. Add the MCP server details there so your entire team gets access automatically.

No. It decodes the payload and header sections deterministically but does not perform cryptographic validation.

Pasting tokens into third-party websites exposes your data. Doing it directly in your editor keeps the debugging process local and secure.

It will attempt to split the token and decode the Base64 segments. If the formatting is completely broken, the tool returns the specific parsing error.

The MCP server processes Base64 strings and JSON Web Tokens. The decoded payload claims will be visible in your chat history, so you must avoid pasting production tokens that contain sensitive user data.

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