How to Use the JWT & Base64 Decoder MCP in Cursor

Inspect auth tokens while you code. Decode Base64 and JWTs deterministically using Cursor.

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Connect JWT & Base64 Decoder MCP to Cursor

Create your Vinkius account to connect JWT & Base64 Decoder to Cursor 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 Cursor

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Claude

Perplexity

Cursor MCP Server Integration

The `decode_jwt_token` tool splits your JSON Web Tokens into readable headers and payloads directly inside your editor. When you debug an auth error, the agent parses the token exactly as your backend would. It translates the expiration claims into actual UTC timestamps automatically. You avoid wasting time trying to figure out if a token expired five minutes ago or five days ago.

Stop Hallucinating Strings

The `decode_base64_string` tool handles raw string conversions without relying on LLM math. You pass it a Base64 encoded string, and it returns the exact UTF-8 output. Large language models fail constantly at byte-level operations. This tool guarantees you get a deterministic translation instead of a bad guess while writing your integration tests.

Agent Mode Auth Debugging

Connecting this MCP server gives your Agent mode precise data extraction capabilities. You can ask the agent to inspect a failing test token and rewrite your validation logic based on the actual claims. It reads the payload data but intentionally skips signature verification. This helps you isolate format errors from cryptographic failures when building authentication middleware.

Setup guide

Set up JWT & Base64 Decoder MCP in Cursor

Prerequisites

Cursor installed (macOS, Windows, or Linux)
Active Vinkius subscription with a valid endpoint token

1

Open MCP Settings

Go to Cursor Settings → MCP or open the Command Palette (Cmd+Shift+P / Ctrl+Shift+P) and search for "MCP: Add Server".
2

Add the JWT & Base64 Decoder MCP

Cursor will create or open .cursor/mcp.json in your project root. Paste the JSON snippet on the right. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Enable Agent mode

Open Composer (Cmd+I / Ctrl+I) and switch to Agent mode using the dropdown at the top. MCP tools are only available in Agent mode.
4

Verify the connection

Ask Cursor something like "List my recent JWT & Base64 Decoder transactions." If the MCP tools are loaded correctly, Cursor will call the JWT & Base64 Decoder tools automatically. You can also check Settings → MCP for a green status indicator.

.cursor/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 Cursor

Create a .cursor/mcp.json file in your project root. Add the MCP server command and arguments, then enable Agent mode in your chat panel.

Context switching kills momentum. You keep your focus in the editor while the agent inspects the exact claims your code is failing to parse.

No, it only extracts the headers and payload data. You use it to inspect the contents of a token, not to prove its authenticity.

Yes. Once the agent reads the exact claims, it can rewrite your middleware to target the correct JSON properties.

The MCP server reads your raw JSON Web Tokens and Base64 strings. Because the decoded headers and payload claims enter your editor's chat context, you should only inspect development or staging tokens to avoid leaking production PII.

Use it with your favorite AI tools

Connect this server to Cursor, Claude, VS Code, and more.

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