Tutorial: Barcode Generation

Utilities

Data source: barcodeapi.org

Overview

Barcode Generation wraps barcodeapi.org, handling authentication, pagination, and rate limits for you. This tutorial covers all 3 tools with working code examples you can copy and run.

Prerequisites

Sign up at https://context.gnist.ai/signup for a free API key (100 calls/day).
Choose your integration method: MCP protocol or REST API.

Connect via MCP

Add to your MCP client config (Claude Desktop, Cursor, etc.):

MCP Config

{
  "mcpServers": {
    "gnist-barcode": {
      "url": "https://context.gnist.ai/mcp/barcode/",
      "headers": {
        "Gnist-API-Key": "YOUR_API_KEY"
      }
    }
  }
}

Tools (3)

`generate_barcode`

Generate a barcode image URL for the given data and type. Returns a URL that renders a barcode image. The URL can be used directly in an <img> tag or opened in a browser. No image data is returned — only the URL. Supported types: code128, code39, ean13, ean8, upc-a, qr.

Parameter	Type	Required	Description
`barcode_type`	string	required	Barcode type: code128, code39, ean13, ean8, upc-a, qr.
`data`	string	required	The data to encode in the barcode.

curl -X POST "https://context.gnist.ai/mcp/barcode/" \
  -H "Content-Type: application/json" \
  -H "Gnist-API-Key: YOUR_API_KEY" \
  -d '{"jsonrpc": "2.0", "method": "tools/call", "id": 1, "params": {"name": "generate_barcode", "arguments": {"barcode_type": "example", "data": "example"}}}'

import httpx

resp = httpx.post(
    "https://context.gnist.ai/mcp/barcode/",
    headers={"Gnist-API-Key": "YOUR_API_KEY"},
    json={'id': 1,
 'jsonrpc': '2.0',
 'method': 'tools/call',
 'params': {'arguments': {'barcode_type': 'example', 'data': 'example'},
            'name': 'generate_barcode'}},
)
print(resp.json())

`list_barcode_types`

List supported barcode types with descriptions. Returns the available barcode types including name, description, and expected data format.

curl -X POST "https://context.gnist.ai/mcp/barcode/" \
  -H "Content-Type: application/json" \
  -H "Gnist-API-Key: YOUR_API_KEY" \
  -d '{"jsonrpc": "2.0", "method": "tools/call", "id": 1, "params": {"name": "list_barcode_types", "arguments": {}}}'

import httpx

resp = httpx.post(
    "https://context.gnist.ai/mcp/barcode/",
    headers={"Gnist-API-Key": "YOUR_API_KEY"},
    json={'id': 1,
 'jsonrpc': '2.0',
 'method': 'tools/call',
 'params': {'arguments': {}, 'name': 'list_barcode_types'}},
)
print(resp.json())

`report_feedback`

Report a bug, feature request, or general feedback for this data source. Use this when something doesn't work as expected, when you'd like a new feature, or when you have suggestions for improvement. Args: feedback: Describe the issue or suggestion. feedback_type: One of 'bug', 'feature_request', or 'general'.

Parameter	Type	Required	Description
`feedback`	string	required
`feedback_type`	string	optional	(default: `general`)

curl -X POST "https://context.gnist.ai/mcp/barcode/" \
  -H "Content-Type: application/json" \
  -H "Gnist-API-Key: YOUR_API_KEY" \
  -d '{"jsonrpc": "2.0", "method": "tools/call", "id": 1, "params": {"name": "report_feedback", "arguments": {"feedback": "example"}}}'

import httpx

resp = httpx.post(
    "https://context.gnist.ai/mcp/barcode/",
    headers={"Gnist-API-Key": "YOUR_API_KEY"},
    json={'id': 1,
 'jsonrpc': '2.0',
 'method': 'tools/call',
 'params': {'arguments': {'feedback': 'example'}, 'name': 'report_feedback'}},
)
print(resp.json())

FAQ

What data does Barcode Generation provide?

Generate barcode image URLs for Code 128, Code 39, EAN-13, EAN-8, UPC-A, and QR formats with data validation. It exposes 3 tools: generate_barcode, list_barcode_types, report_feedback.

What do I need to get started?

A Gnist API key (free tier: 100 calls/day). Sign up at https://context.gnist.ai/signup.

What format does the Barcode Generation API return?

JSON, via either MCP protocol (JSON-RPC 2.0) or REST API.