#+TITLE: MCP QR Code Server

• Overview Generate QR codes seamlessly using the Model Context Protocol (MCP). This server connects large language models to QR code generation capabilities across multiple client interfaces.

• Features

• Generate QR codes for multiple content types:
  • URLs and website links
  • WiFi network credentials
  • Contact information (vCard)
  • Plain text
  • Calendar events (iCal)
• Multiple output formats:
  • PNG images (base64-encoded)
  • ASCII/text representation
  • Data URL format
• Customization options:
  • Size adjustment (100-1000px)
  • Error correction levels (L, M, Q, H)
  • Format selection (image, text)

• Quick Examples

#+begin_example Please generate a QR code for https://example.com #+end_example

#+begin_example Generate a QR code for the Wi-Fi network "GuestWiFi" with password "Welcome123" #+end_example

#+begin_example Create a QR code for my contact information: Name: John Doe Email: john@example.com Phone: 555-123-4567 #+end_example

• Installation

#+begin_src bash npm install -g @jwalsh/mcp-server-qrcode #+end_src

• Usage

** Claude Desktop #+begin_src json { "mcpServers": { "qrcode": { "command": "npx", "args": [ "-y", "@jwalsh/mcp-server-qrcode" ] } } } #+end_src

For detailed setup instructions, please refer to:

• [[https://modelcontextprotocol.io/quickstart/user][MCP for Claude Desktop Users]]
• [[https://modelcontextprotocol.io/quickstart/server][Building MCP Servers]]
• [[https://docs.anthropic.com/en/docs/agents-and-tools/mcp][Anthropic MCP Documentation]]

** Claude Desktop

#+begin_src json { "mcpServers": { "qrcode": { "args": [ "-y", "@jwalsh/mcp-server-qrcode" ], "command": "npx" } } } #+end_src

** Emacs with mcp.el #+begin_src elisp :results silent ;; Basic installation with straight.el (use-package mcp :straight (mcp :type git :host github :repo "lizqwerscott/mcp.el")) #+end_src

#+begin_src elisp :results silent ;; Connect to the QR code server (mcp-connect-server "qrcode" "npx" '("-y" "@jwalsh/mcp-server-qrcode") :initial-callback (lambda (connection) (message "Connected to %s" (jsonrpc-name connection))) :tools-callback (lambda (connection tools) (message "Available tools: %s" tools))) #+end_src

#+begin_src elisp :results raw :wrap example ;; Generate a QR code (let ((connection (gethash "qrcode" mcp-server-connections))) (mcp-call-tool connection "generate-qrcode" '(:content "https://example.com" :format "text"))) #+end_src

#+RESULTS: #+begin_example (:content [(:type text :text QR Code for "https://example.com":

█████████████████████████████████ █████████████████████████████████ ████ ▄▄▄▄▄ █▄▀ █ ▀ █▀█ ▄▄▄▄▄ ████ ████ █ █ █▄ ▄█▀ ▀█▄█ █ █ ████ ████ █▄▄▄█ █▀ █ ▀█ ███ █▄▄▄█ ████ ████▄▄▄▄▄▄▄█▄▀▄█ █ ▀ █▄▄▄▄▄▄▄████ ████ ▀▄▀▀▀▄▄▀▀ ▄▀▄▀▀ █▀▄▀ ████ ████▄▀█▄▀ ▄▄▀ ▀▀█▄▀▄█▀▄ ▄█▄████ █████▀▀▄ ▄▄▄ ▀ █ ▄█ █ ███▀ ████ ████▄▄▄█▄▄▄▀▄▀█▀ ▄ ▄ ▄▀▀ ▄█▄████ ████▄▄██▄█▄▄▀▄███ █ ▄▄▄ ██▄▀████ ████ ▄▄▄▄▄ █▄█▄▄█▀█▀ █▄█ ██▀ ████ ████ █ █ ██ █▄ ▄█▄▄ ▄▄ █▀ ▄████ ████ █▄▄▄█ █▄ █▀ ▄ ▀ ▄█▄▄████ ████▄▄▄▄▄▄▄█▄▄▄██▄▄█▄█▄██▄██▄████ █████████████████████████████████ █████████████████████████████████ )]) #+end_example

** MCP Inspector

#+begin_src bash npx -y @modelcontextprotocol/inspector npx -y @jwalsh/mcp-server-qrcode #+end_src

** NPM Package CLI

#+begin_src bash

Verify installation

echo '{"method":"tools/list","params":{},"id":1,"jsonrpc":"2.0"}' | mcp-server-qrcode | jq -r '.result.tools[]|.name' #+end_src

#+RESULTS: : generate-qrcode

#+begin_src bash :results raw :results raw

Generate QR code via JSON-RPC

echo '{"method":"tools/call","params":{"name":"generate-qrcode","arguments":{"content":"https://example.com","format":"text"}},"id":1,"jsonrpc":"2.0"}' | mcp-server-qrcode | jq -r '.result.content[0].text' #+end_src

#+RESULTS: QR Code for "https://example.com":

█████████████████████████████████ █████████████████████████████████ ████ ▄▄▄▄▄ █▄▀ █ ▀ █▀█ ▄▄▄▄▄ ████ ████ █ █ █▄ ▄█▀ ▀█▄█ █ █ ████ ████ █▄▄▄█ █▀ █ ▀█ ███ █▄▄▄█ ████ ████▄▄▄▄▄▄▄█▄▀▄█ █ ▀ █▄▄▄▄▄▄▄████ ████ ▀▄▀▀▀▄▄▀▀ ▄▀▄▀▀ █▀▄▀ ████ ████▄▀█▄▀ ▄▄▀ ▀▀█▄▀▄█▀▄ ▄█▄████ █████▀▀▄ ▄▄▄ ▀ █ ▄█ █ ███▀ ████ ████▄▄▄█▄▄▄▀▄▀█▀ ▄ ▄ ▄▀▀ ▄█▄████ ████▄▄██▄█▄▄▀▄███ █ ▄▄▄ ██▄▀████ ████ ▄▄▄▄▄ █▄█▄▄█▀█▀ █▄█ ██▀ ████ ████ █ █ ██ █▄ ▄█▄▄ ▄▄ █▀ ▄████ ████ █▄▄▄█ █▄ █▀ ▄ ▀ ▄█▄▄████ ████▄▄▄▄▄▄▄█▄▄▄██▄▄█▄█▄██▄██▄████ █████████████████████████████████ █████████████████████████████████

• Developer Documentation For detailed setup, installation, contribution guidelines, and additional integration methods, please refer to [[file:DEVELOPERS.org][DEVELOPERS.org]].