How to Use the JWT & Base64 Decoder MCP in Windsurf

Q: Can Windsurf decode expired tokens using JWT & Base64 Decoder?

Yes. The decodejwttoken tool extracts the payload and calculates the exact UTC expiration date regardless of whether the token is expired. This helps you diagnose token expiration issues directly in your workspace.

Q: How do I configure this MCP Server in my Windsurf settings?

Open your Windsurf settings and add the server to your mcpconfig.json file under the mcpServers key. Once you click refresh in the MCP panel, Cascade auto-discovers the tools and uses them when you ask about base64 or JWTs.

Get deterministic JWT parsing and raw base64 decoding directly inside Windsurf without LLM math hallucinations.

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Connect JWT & Base64 Decoder MCP to Windsurf

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

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Stop token math hallucinations in Windsurf

Your agent uses `decode_jwt_token` to extract headers, payloads, and exact expiration timestamps instantly. LLMs fail at base64 math because they operate on tokens rather than raw bytes, which leads to corrupted signatures or incorrect claims. This tool provides deterministic byte-level execution so your agent gets exact values every time. Cascade reads your auth configuration files, grabs the token from your local environment, and decodes it without you having to copy-paste anything. You get the exact UTC expiration time and payload claims printed directly in your active chat.

Decode raw base64 data using this MCP Server

Your agent uses `decode_base64_string` to convert encoded strings back into plain UTF-8 text. This is critical when debugging encoded config files, basic auth headers, or raw payload blocks that clog up your logs. Instead of guessing the contents or sending them to an external site, the tool handles the conversion locally. This MCP Server runs inside a secure sandbox to keep your payloads private. Your agent executes the decoding step as part of its automated debugging loop, making it easy to inspect raw data on the fly.

Chain auth debugging tasks autonomously

Your agent uses `decode_jwt_token` and `decode_base64_string` to chain complex authentication debugging tasks autonomously. Cascade identifies the expired token, runs the decoder to inspect the claims, and then updates the configuration file with the new credentials. You set the final goal and let the agent handle the steps. This direct integration stops sensitive keys from leaking to untrusted web decoders. Your agent does the heavy lifting inside your workspace, maintaining a clean audit trail and saving you from constant context switching.

Setup guide

Set up JWT & Base64 Decoder MCP in Windsurf

Prerequisites

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

1

Open MCP configuration

Click the Cascade assistant icon in the sidebar, then click the hammer icon (🔨) at the top of the panel. Select "Configure" to open ~/.codeium/windsurf/mcp_config.json.
2

Add the JWT & Base64 Decoder 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

Refresh MCPs

Go back to the hammer icon (🔨) in Cascade and click "Refresh". Windsurf will detect the new server. No full restart is needed — the connection is hot-reloaded.
4

Verify in Cascade

Start a new Cascade conversation and ask something like "Show my JWT & Base64 Decoder payment history." If connected, Cascade will call the JWT & Base64 Decoder tools directly. You will see a green dot next to the server name in the MCP panel.

mcp_config.json

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

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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 Windsurf

Windsurf connects to the server through your local configuration file. When you ask Cascade to inspect a token, it automatically calls `decode_jwt_token` or `decode_base64_string` to parse the data. You do not have to trigger the tools manually.

Yes. The `decode_jwt_token` tool extracts the payload and calculates the exact UTC expiration date regardless of whether the token is expired. This helps you diagnose token expiration issues directly in your workspace.

No. The tools only decode the header and payload. They do not verify the cryptographic signature against a public key, so you should not use this to validate token authenticity in production.

Open your Windsurf settings and add the server to your `mcp_config.json` file under the `mcpServers` key. Once you click refresh in the MCP panel, Cascade auto-discovers the tools and uses them when you ask about base64 or JWTs.

Your tokens stay within the secure V8 isolate sandbox managed by Vinkius. The decoder does not save or transmit your sensitive auth tokens to any external database, keeping your credentials secure from third-party leaks.

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