What algorithms does this MCP support for signature verification?

The verify_jwt_signature capability supports HS256, RS256, and ES256 algorithms.

Can I use this with Claude or Cursor?

Yes, you can connect this MCP to any MCP-compatible client including Claude, Cursor, and Windsurf.

Does this MCP handle expired tokens?

Yes, the validate_jwt_temporal_claims capability specifically checks if a token is expired or not yet active.

Do I need to host this myself?

No, Vinkius hosts and manages the MCP for you. You just connect and start using the capabilities.

How does the agent know if a token is structurally sound?

The agent uses the parse_jwt_string capability to verify the token follows the required three-part format.

What algorithms are supported for signature verification?

The verify_jwt_signature capability supports HS256, RS256, and ES256 algorithms.

Can I check if a token has expired?

Yes, by using the validate_jwt_temporal_claims capability with the decoded payload and the current timestamp.

Does this server verify the authenticity of the token?

The verify_jwt_signature capability can validate the signature if you provide the appropriate secret or public key.

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Connect JWT Decoder & Validator to ChatGPT and Claude

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. Inspect and verify token integrity instantly with your AI client.

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.

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.

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 · 4 capabilities

We ship only the actions that matter.

Capability set01 / 01

01-04

4 capabilities in this set.

Part of 4 available through JWT Decoder & Validator.

01
Validate jwt temporal claims
This capability checks if a token is still valid based on time. It compares standard time-based claims against the current system time to catch expired or premature tokens.
02
Verify jwt signature
This capability performs cryptographic validation. It ensures the signature matches the header and payload using a specific key and supported algorithms.
03
Decode jwt components
This capability extracts the readable JSON data. It pulls the content out of the JWT header and payload so your agent can read it.
04
Parse jwt string
This capability checks the basic format. It verifies that a string actually follows the standard three-part JWT structure.

Real work

What teams actually run

Auth Debugging

When an API returns a 401, give the token to your agent to see if it's expired or has a bad signature.

Security Auditing

Verify that your application is correctly validating signatures using the right algorithms.

Payload Inspection

Quickly read the claims inside a token to understand user permissions or metadata.

Automated Testing

Have your agent generate or check tokens to test how your system handles different temporal claims.

One connector, every AI

JWT Decoder & Validator 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.

Building your own app? The connector is yours to use.

You don't need a client to put JWT Decoder & Validator 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

732ms average. Fast in production.

JWT Decoder & Validator is checked daily against the live service.

Daily averagePeak 915ms

Oct 3Today

Fastest day: 542ms
Slowest day: 915ms
14-day trend: Improving-10%

Connect your client

One URL. Every client.

Activate the Connector, copy your link, and paste it into the client you already use. 4 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 & Validator, so you can see the experience inside your AI.

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

JWT Decoder & Validator Connector

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

Connector linkhttps://edge.vinkius.com/vk_preview_E47Wl1pMoDCfXmcNGBlWo7ceQ1TGjYjWMSJWkgQy/mcp

Claude Desktop

Follow the steps below to connect in seconds.

1In Claude Desktop, open Settings → Connectors.
2Click “Add custom connector” and paste the connector link above as the remote MCP server URL.
3Click Add and start a new chat — JWT Decoder & Validator capabilities are ready to use.

Configuration · claude_desktop_config.jsonCopy

{
  "mcpServers": {
    "jwt-decoder-validator-mcp": {
      "url": "https://edge.vinkius.com/vk_preview_E47Wl1pMoDCfXmcNGBlWo7ceQ1TGjYjWMSJWkgQy/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 & Validator in Claude and other AIs

See all the AI clients this connector works with ↑

Who it's for

Built for the work JWT Decoder & Validator owners hand off.

This MCP is built for developers and security professionals who handle identity and access management.

01
Backend Developers
Hand off raw tokens to your agent to debug authentication logic or session issues.
02
Security Engineers
Use your agent to quickly verify if signatures are valid or if tokens are being misused.
03
QA Engineers
Have your agent validate that expired or malformed tokens are being rejected correctly.

FAQ

Questions JWT Decoder & Validator owners ask.

01
What algorithms does this MCP support for signature verification?
The verify_jwt_signature capability supports HS256, RS256, and ES256 algorithms.
02
Can I use this with Claude or Cursor?
Yes, you can connect this MCP to any MCP-compatible client including Claude, Cursor, and Windsurf.
03
Does this MCP handle expired tokens?
Yes, the validate_jwt_temporal_claims capability specifically checks if a token is expired or not yet active.
04
Do I need to host this myself?
No, Vinkius hosts and manages the MCP for you. You just connect and start using the capabilities.
05
How does the agent know if a token is structurally sound?
The agent uses the parse_jwt_string capability to verify the token follows the required three-part format.
06
What algorithms are supported for signature verification?
The verify_jwt_signature capability supports HS256, RS256, and ES256 algorithms.
07
Can I check if a token has expired?
Yes, by using the validate_jwt_temporal_claims capability with the decoded payload and the current timestamp.
08
Does this server verify the authenticity of the token?
The verify_jwt_signature capability can validate the signature if you provide the appropriate secret or public key.

Explore

More in Security

Connect JWT Decoder & Validator to Claude, Cursor, ChatGPT & more

Your AI does the work. We keep it safe and sound.

Each Connector runs inside its own sealed environment.

One switch stops every agent. Instantly.

Spending limits that pause instead of surprise.

We ship only the actions that matter.

01-04

Validate jwt temporal claims

Verify jwt signature

Decode jwt components

Parse jwt string

What teams actually run

Auth Debugging

Security Auditing

Payload Inspection

Automated Testing

Building your own app? The connector is yours to use.

JWT Decoder & Validator Connector

Claude Desktop

Backend Developers

Security Engineers

QA Engineers

What algorithms does this MCP support for signature verification?

Can I use this with Claude or Cursor?

Does this MCP handle expired tokens?

Do I need to host this myself?

How does the agent know if a token is structurally sound?

What algorithms are supported for signature verification?

Can I check if a token has expired?

Does this server verify the authenticity of the token?

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