barcode — barcode & QR tools MCP server

Barcode/QR decode, render and product-code (GTIN) validation for AI agents over the Model Context Protocol. One WASM engine (zxing-cpp via zxing-wasm) does both render and decode — fully headless.

Use the hosted endpoint — no install, no local process:

https://mcp.casuyi.com/mcp

MCP 2026-07-28 (2025-era clients supported too), stateless Streamable HTTP, works with Claude Code, Claude Desktop, Cursor, VS Code, and any MCP client.

Tools

Related MCP server: QR Reader MCP Server

Connect

Claude Code

claude mcp add barcode --transport http https://mcp.casuyi.com/mcp

Claude Desktop — Settings → Connectors → Add custom connector → URL above.

Cursor / VS Code (Copilot) / Windsurf / any mcpServers JSON client

{
  "mcpServers": {
    "barcode": { "type": "http", "url": "https://mcp.casuyi.com/mcp" }
  }
}

Pricing

All tools are completely free. No API key, no payment, no signup.

A free service by Casuyi.

Try it right now (curl, no client needed)

curl -sS -X POST https://mcp.casuyi.com/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"validate_gtin","arguments":{"code":"4006381333931"}}}'

→ {"valid": true, "type": "ean13", ...} (reply is one SSE data: line — see examples).

Docs

• examples/quickstart.md — every call shape: list tools, render, decode

• examples/clients.md — connect from Claude Code / Desktop / Cursor / any MCP client

• clients/python.py — minimal Python client (stdlib only)

Status / support

Open an issue for: a symbology you need, size limits (images are accepted up to ~4 MB base64), uptime questions.