MCP For Claude Marketplace
JWT Decoder & Validator

JWT Decoder & Validator MCP Connector for Claude

A+

Decode JWT segments and verify cryptographic signatures and temporal claims.

4 tools Official Updated Oct 1, 2026 Official Vinkius Partner
More Details Connect to Claude

This MCP server provides a specialized utility to inspect JSON Web Tokens (JWT). You can use parse_jwt_string to check the structural integrity of a token, decode_jwt_components to extract readable JSON from headers and payloads, verify_jwt_signature to cryptographically validate signatures using HS256, RS256, or ES256 algorithms, and validate_jwt_temporal_claims to ensure tokens are not expired or active before their 'nbf' time.

jwtsecuritycryptographyauthtoken-validation

4 tools expose this connector's capabilities to your AI agent.

validate_jwt_temporal_claims

Checks the validity of standard time-based claims against the current system time

verify_jwt_signature

Cryptographically validates that the signature matches the provided header and payload using a specified key

decode_jwt_components

Extracts and decodes the readable JSON content from the JWT header and payload

parse_jwt_string

Verifies if a provided string adheres to the fundamental three-part format of a JWT

See how to talk to your AI agent using JWT Decoder & Validator.

Is this JWT valid: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

The token structure is valid, and the `parse_jwt_string` tool confirms it contains 3 segments.

Decode this JWT payload: eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ

The decoded payload is: {"sub":"1234567890","name":"John Doe","iat":1516239022}

Check if this payload is still valid at timestamp 1700000000: {"exp": 1600000000}

The token is not temporally valid because the 'exp' claim has passed.

The `verify_jwt_signature` tool supports HS256, RS256, and ES256 algorithms.

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