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Vinkius

JWT Decoder & Validator Connector for AI agents.

4 live capabilities

Validate and decode authentication tokens to debug security issues.

Live agent request JWT Decoder & Validator / Connector

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Why people use JWT Decoder & Validator

JWT Decoder & Validator for Secure Auth Debugging

With this Connector, you just give the token to your agent. It handles the decoding and signature verification instantly. You get a clear breakdown of the headers and payload without ever leaving your environment.

  • Claude
  • ChatGPT
  • Gemini
  • Cursor
  • Visual Studio Code
  • Windsurf

What Vinkius changes

You get instant, secure validation of authentication tokens without leaving your dev environment.

Use it from Claude, ChatGPT, Cursor or another AI client you already have.

One account · 6,100+ Connectors

  1. Real-world use case 01

    Debugging Login Failures

    A backend dev gets a 401 Unauthorized and asks the agent to check if the token is expired or if the signature is actually valid.

  2. Real-world use case 02

    Security Auditing

    A security engineer needs to see what claims are inside a production token to ensure no sensitive data is being leaked in the payload.

  3. Real-world use case 03

    Key Rotation Testing

    A dev is switching from HS256 to RS256 and needs to verify the new signature is valid using the `verify_jwt_signature` capability.

Complete set · 4capabilities

The complete JWT Decoder & Validator capability set.

These are the exact actions your AI can choose when you ask it to work with JWT Decoder & Validator.

Capability set01 / 01

01—04

4 capabilities in this set.

Part of 4 available through JWT Decoder & Validator.

  1. 01 Capability

    Decode jwt components

    Extracts the readable JSON content from the JWT header and payload. Use this to see what's inside a token without manual decoding.

  2. 02 Capability

    Parse jwt string

    Checks if a string actually follows the three-part JWT format. It's the first step to see if a token is even valid.

  3. 03 Capability

    Validate jwt temporal claims

    Checks standard time-based claims like 'exp' and 'nbf' against your system time. It tells you if a token is currently active.

  4. 04 Capability

    Verify jwt signature

    Validates that the signature matches the header and payload using your provided key. It supports HS256, RS256, and ES256 algorithms.

Set up in minutes

One URL. Then ask JWT Decoder & Validator to work.

Claude and ChatGPT only need the Connector URL. Copy it once, add it in settings, and use JWT Decoder & Validator from the conversation.

Choose your client

Live preview
Advanced clients IDE · CLI

Claude · Web + desktop

Official guide ↗

Connector URL · ready to paste

Streamable HTTP
https://edge.vinkius.com/vk_preview_E47Wl1pMoDCfXmcNGBlWo7ceQ1TGjYjWMSJWkgQy/mcp
  1. Step 01

    Open Connectors

    In Claude Web or Claude Desktop, open Settings and choose Connectors.

  2. Step 02

    Add the URL

    Choose Add custom connector, name it JWT Decoder & Validator, and paste the URL above.

  3. Step 03

    Turn it on in chat

    Select +, open Connectors, and enable JWT Decoder & Validator for the conversation.

Where the request belongs

Work JWT Decoder & Validator can move forward.

Built around the request

Security engineers, backend developers, and QA engineers who are tired of manually decoding tokens or troubleshooting failed logins.

01

Security Engineer

Auditing authentication flows and checking for signature mismatches during security reviews.

02

Backend Developer

Debugging why a user's login is failing or why a token is being rejected by the API.

03

QA Engineer

Testing edge cases like expired tokens or 'not before' timestamps in automated test suites.

Build the capability set

Add more capabilities.

Each Connector adds new actions and data without changing how you work.

Browse Connectors
JWT Claims Validator logo
01 1 capability

JWT Claims Validator

Validate JWT structure and expiration claims without signature verification.

View Connector
JWT Payload Extractor logo
02 3 capabilities

JWT Payload Extractor

Extract and decode JWT payloads deterministically without cryptographic verification.

View Connector
Webhook HMAC Signature Validator logo
03 3 capabilities

Webhook HMAC Signature Validator

Verify the authenticity of incoming webhook payloads by validating their HMAC signatures.

View Connector
JWT Decoder & Verifier logo
04 1 capability

JWT Decoder & Verifier

Decode and mathematically verify JWT tokens local. Ensure API authentication tokens are cryptographically authentic and not expired.

View Connector
Deterministic JWT Inspector logo
05 1 capability

Deterministic JWT Inspector

Transform your AI into a cybersecurity diagnostic capability. Instantly decode and inspect JSON Web Tokens (Headers, Payloads, and Expiry metadata) without requiring signature keys.

View Connector
JWT & Base64 Decoder logo
06 2 capabilities

JWT & Base64 Decoder

Stop hallucinating Base64 translations. Instantly decode complex JWT tokens into readable headers and payloads with exact expiration mathematics.

View Connector

Bring your own AI

Change the model, client or framework. Keep JWT Decoder & Validator connected.

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Before you connect

Questions about JWT Decoder & Validator.

The practical details behind the request, access and result.

How can I use the JWT Decoder & Validator MCP to debug authentication?

You can ask your agent to decode a token's payload or check its signature. It provides a clear breakdown of the JSON content so you can see exactly what's inside without manual effort.

Can the JWT Decoder & Validator MCP check if a token is expired?

Yes, it checks standard time-based claims like 'exp' and 'nbf' against your current system time to tell you if a token is still active.

Is it safe to use the JWT Decoder & Validator MCP with production tokens?

Yes, it's safer than using web-based decoders because the processing happens through your agent in your own environment rather than on a third-party website.

What signature algorithms does the JWT Decoder & Validator MCP support?

It supports the most common cryptographic algorithms, including HS256, RS256, and ES256, making it versatile for different security setups.

Can the JWT Decoder & Validator MCP decode headers and payloads?

It can extract and display the readable JSON content from both the header and the payload of any standard JWT.

How does the JWT Decoder & Validator MCP help with security audits?

It allows you to quickly inspect claims and verify signatures, helping you ensure that tokens aren't leaking sensitive data and that your keys are correctly configured.

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.

One connection away

Give your agent a direct line to JWT Decoder & Validator.

Connect JWT Decoder & Validator once. Keep it beside 6,100+ managed Connectors when the next task needs more.

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