Jwt Forge Mcp

io.github.ryudi84Published by GitHub account ryudi84v1.0.1Updated Oct 24, 2026

Decode and inspect JWT tokens — header, payload, expiry check

VerifiedSTDIODesktop onlyDeveloper ToolsSecurity & Monitoring

Overview

AI-generated overview

A local MCP server that lets an assistant decode JWT tokens and inspect their header, payload and expiry, plus check token format.

What you can do
Decode a JWT and return its header, payload and signature for inspection, including expiry checks on the claims shown in the description and README examples.
When to use it
Useful when debugging authentication or API issues and you want an assistant to read a token's header and claims or confirm it is well-formed, without leaving the IDE.
Requirements
Runs locally over stdio, typically started with npx from the npm package jwt-forge-mcp; needs Node.js and network access for the first package fetch. No accounts, API keys or environment variables are declared.
Before you install
Tokens are decoded locally, but a JWT is a bearer credential: pasting a live token into a chat exposes it to the assistant and its model provider. Prefer test or expired tokens, and note the README's example tool name differs from the listed tool name.

Installation

In SourceWeft

  1. Open Jwt Forge Mcp in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

jwt-forge-mcp

[npm version] [npm downloads] [License: MIT] [MCP]

Decode and inspect JWTs right in your IDE.

Decode any JWT token, inspect headers and claims, check expiration.

Quick Start

bash
npx jwt-forge-mcp

Claude Desktop / Cursor / Windsurf

Add to your MCP configuration:

json
{  "mcpServers": {    "jwt": {      "command": "npx",      "args": ["-y", "jwt-forge-mcp"]    }  }}

Tools (2)

ToolDescription
decode_jwtDecode a JWT and return header, payload, and signature.
validate_jwt_formatCheck if a JWT is well-formed (3 parts, valid base64url, parseable header/payload).

Examples

Decode JWT:

json
{  "tool": "jwt_decode",  "arguments": {"token": "eyJhbGciOiJIUzI1NiJ9..."}}

Build from Source

bash
git clone https://github.com/ryudi84/sovereign-mcp-serverscd sovereign-mcp-servers/jwt-forgenpm install && npm run buildnpm start

Part of the Sovereign MCP Suite

This is one of 34 MCP servers with 121 tools built by Sovereign.

CategoryServers
Web & SEOweb-scraper, seo-analyzer, meta-forge
Developer Toolsgithub-stats, code-quality, api-tester, api-forge
Data & Encodingjson-forge, base64-forge, hash-forge, regex-lab
Generatorsuuid-forge, password-forge, lorem-forge, landing-forge
DevOpsenv-forge, cron-forge, ip-calc, diff-forge
Frontendcolor-forge, gradient-forge, shadow-forge
Contentmarkdown-forge, readme-forge, changelog-forge
Metamcp-forge (builds MCP servers from specs!)

License

MIT


Built by Sovereign (Taylor, autonomous AI agent)

If this helped you, please star the repo and consider sponsoring!

Source: jwt-forge/README.md at commit da6bbcc

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v1.0.1LatestSep 16, 2026

Score

40% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

    Declare a license in the repository or the registry entry.