How to Use the JWT Decoder & Verifier MCP in Claude Code

Q: How do I configure JWT Decoder & Verifier in Claude Code?

Run the claude mcp add command in your terminal, specifying the transport and the server URL. The tool configuration is stored in your local .claude.json file.

Q: Does the tool check for token expiration?

Yes, the decodejwt tool automatically compares the exp claim against the system clock to verify if the token is still valid.

Decode and verify JWTs from your terminal with Claude Code to audit production tokens and debug auth pipelines.

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Setup JWT Decoder & Verifier with Claude Code

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Terminal-driven token auditing with Claude Code

Pipe live token logs directly into your terminal agent and let it use the `decode_jwt` tool to parse payloads. Claude Code verifies signatures on the fly, making it easy to audit tokens during an active incident. There is no GUI or browser wrapper to slow you down. You get instant access to header, payload, and signature status right in your shell with this MCP Server.

Offline signature validation

Run cryptographic checks locally in your terminal session using the `decode_jwt` tool. The tool handles both HS256 and RS256 signature verification without external network calls. This ensures that even in locked-down staging or production environments, you can safely verify if a token was signed by the correct key.

Direct claims parsing

Stop writing custom jq commands to parse base64 parts of a token when the `decode_jwt` tool outputs clean JSON. The tool decodes the header, payload, and expiration status instantly. Your terminal agent reads this output to verify if the token is expired or contains the correct scopes, keeping your focus on debugging.

Setup guide

Set up JWT Decoder & Verifier MCP in Claude Code

Prerequisites

Claude Code CLI installed (npm install -g @anthropic-ai/claude-code)
Active Vinkius subscription with a valid endpoint token

1

Run the add command

Open your terminal and run the command shown on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com. Use --scope user to make it available across all projects.
2

Verify the connection

Start a Claude Code session and type /mcp to list connected servers. You should see jwt-decoder-verifier-mcp with a green status indicator.
3

Start using tools

Ask Claude Code something like "Check my latest JWT Decoder & Verifier transactions." It will automatically discover and invoke the available JWT Decoder & Verifier tools.

Terminal

claude mcp add --transport http jwt-decoder-verifier-mcp https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

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Prerequisites

Claude Code CLI installed
Active Vinkius subscription with a valid endpoint token

1

Open the config file

Create or edit .mcp.json in your project root for project-level scope, or ~/.claude.json for user-level scope.
2

Add the JWT Decoder & Verifier MCP

Paste the JSON snippet shown on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Code

Start a new Claude Code session. Type /mcp to confirm the server is connected. The tools will be automatically available in your conversation.

.mcp.json

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

Get your connection token →

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Common questions about JWT Decoder & Verifier MCP in Claude Code

Run the `claude mcp add` command in your terminal, specifying the transport and the server URL. The tool configuration is stored in your local `.claude.json` file.

Yes, this MCP Server works perfectly in headless environments. You can run automated scripts that use the terminal agent to verify tokens during test runs.

Web decoders can leak your tokens and keys to third parties. This MCP tool runs locally in your terminal, keeping your authentication data completely private.

Yes, the `decode_jwt` tool automatically compares the `exp` claim against the system clock to verify if the token is still valid.

The MCP Server processes JWT data and signing keys entirely in local memory. No token payloads, secrets, or public keys are transmitted over the internet or stored on external infrastructure.

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