# Barcode Check Digit Checker (`junipr/barcode-check-digit-checker`) Actor

Check barcode check digits for common product identifier formats and explain which rows fail validation.

- **URL**: https://apify.com/junipr/barcode-check-digit-checker.md
- **Developed by:** [junipr](https://apify.com/junipr) (community)
- **Categories:** Developer tools, E-commerce
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

from $1.95 / 1,000 identifier validateds

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/platform/actors/running/actors-in-store#pay-per-event

## What's an Apify Actor?

Actors are web data automations that power AI and operations. They run on the Apify platform to scrape websites, process data, connect APIs, and automate workflows.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.
Actors are written with capital "A".

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.
The best way to integrate Actors is as follows.

- **AI agents and MCP clients** — the [Apify MCP server](https://docs.apify.com/integrations/mcp.md) at `https://mcp.apify.com` (remote, streamable HTTP, OAuth on first use).
- **Agentic workflows and local Actor development** — [Agent Skills](https://apify.com/.well-known/agent-skills/index.json) with the [Apify CLI](https://docs.apify.com/cli/docs.md): `npm install -g apify-cli`, then `apify login`.
- **JavaScript/TypeScript projects** — the official [JS/TS client](https://docs.apify.com/api/client/js/docs.md): `npm install apify-client`.
- **Python projects** — the official [Python client](https://docs.apify.com/api/client/python/docs.md): `pip install apify-client`.
- **Any other language** — the [REST API](https://docs.apify.com/api/v2.md).

For usage examples, see the [API](#api) section below.

For more details, see Apify documentation as [Markdown index](https://docs.apify.com/llms.txt) and [Markdown full-text](https://docs.apify.com/llms-full.txt).

# README

## Barcode Check Digit Checker

### Store Positioning

**Store title:** Barcode Check Digit Checker

**Short description:** Check barcode check digits for common product identifier formats and explain which rows fail validation.

**SEO title:** Barcode Check Digit Checker — fast deterministic data utility

**SEO description:** Check barcode check digits for common product identifier formats and explain which rows fail validation. Use it for fast, low-cost normalization or validation at scale with predictable pay-per-event pricing.

**Categories:** DEVELOPER\_TOOLS, ECOMMERCE

**Keywords:** barcode, check, digit, checker, tiny deterministic utility

### Pay-Per-Event Pricing

This actor uses pay-per-event pricing. Event prices include Apify platform usage; users are not expected to pay a separate platform-usage pass-through charge for the configured pricing model.

- Tier: U1 — Tiny deterministic utility
- Primary event: `identifier-validated` at $0.00195 base
- Default max charge: $1.00
- Store discounts: FREE/BRONZE base, SILVER discounted, GOLD deepest approved discount

Event set:

- `actor-start`: base $0.00176, GOLD $0.00141. Barcode Check Digit Checker: charged when actor start is completed. The price includes Apify platform usage; no separate usage pass-through is intended.
- `identifier-validated`: base $0.00195, GOLD $0.00156. Barcode Check Digit Checker: charged when identifier validated is completed. The price includes Apify platform usage; no separate usage pass-through is intended.
- `report-generated`: base $0.02000, GOLD $0.01600. Barcode Check Digit Checker: charged when report generated is completed. The price includes Apify platform usage; no separate usage pass-through is intended.

The actor accepts `actor-start` before work, accepts the primary event before each dataset row, and accepts the configured report event before writing report files. If `maxChargeUsd` or the live PPE limit blocks a charge, the corresponding row or report is not written.

### Public Task Concepts

- Audit Barcode Check Digit controls on a capped public sample
- Find high-priority Barcode Check Digit issues before release
- Validate Barcode Check Digit evidence from supplied pages
- Prioritize Barcode Check Digit fixes with severity and proof
- Export Barcode Check Digit QA rows for client review
  Validate barcode check digits and explain row failures.

### What It Does

Computes expected digits for GTIN-8/12/13/14, ISBN-10, and ISBN-13, then reports expected vs actual check digit and exact error type.

### Inputs

This actor exposes these input fields in `.actor/input_schema.json`:

- `inputRows`
- `fileUrl`
- `codeColumn`
- `formats`
- `maxRows`
- `includeValidRows`
- `strictMode`
- `maxChargeUsd`

The exact default checks the public ISBN-10/ISBN-13 edition pair `0-306-40615-2` and `978-0-306-40615-7`, verified through Open Library at 2026-07-12T05:48:00Z.

### Outputs

Dataset rows contain:

- `rowIndex`
- `originalCode`
- `normalizedCode`
- `detectedFormat`
- `expectedCheckDigit`
- `actualCheckDigit`
- `checkDigitValid`
- `errorType`
- `recommendation`

Sample outputs in `examples/output.sample.json` and `output.sample.json` were generated from `examples/input.tiny.json` through actor logic.

### Reports

After the configured report charge is accepted, the actor writes its Markdown, JSON, or CSV reports to the key-value store. A rejected report charge leaves those files unwritten.

### Public Task Concepts

- Normalize Barcode Check Digit Checker records
- Validate Barcode Check Digit Checker values in bulk
- Generate a small utility report for Barcode Check Digit Checker

### Safe use

Use small capped runs first. Network paths are bounded; review output quality and costs before increasing limits.

# Actor input Schema

## `inputRows` (type: `array`):

Supplied rows for Barcode Check Digit Checker to process directly.

## `fileUrl` (type: `string`):

Public file URL to fetch or inspect for Barcode Check Digit Checker.

## `codeColumn` (type: `string`):

Code Column controls Barcode Check Digit Checker processing for the supplied inputs; keep values conservative for first runs.

## `formats` (type: `array`):

Formats controls Barcode Check Digit Checker processing for the supplied inputs; keep values conservative for first runs.

## `maxRows` (type: `number`):

Maximum rows to process in one run; keep defaults low for safe first runs.

## `includeValidRows` (type: `boolean`):

Include valid rows in output rows or reports when available.

## `strictMode` (type: `boolean`):

Strict Mode controlling how Barcode Check Digit Checker processes the supplied inputs.

## `maxChargeUsd` (type: `number`):

Maximum estimated PPE charge allowed for the run before the actor stops gracefully.

## Actor input object example

```json
{
  "inputRows": [
    {
      "code": "0-306-40615-2"
    },
    {
      "code": "978-0-306-40615-7"
    }
  ],
  "fileUrl": "",
  "codeColumn": "code",
  "formats": [
    "ISBN-10",
    "ISBN-13"
  ],
  "maxRows": 2,
  "includeValidRows": true,
  "strictMode": true,
  "maxChargeUsd": 1
}
```

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {};

// Run the Actor and wait for it to finish
const run = await client.actor("junipr/barcode-check-digit-checker").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = {}

# Run the Actor and wait for it to finish
run = client.actor("junipr/barcode-check-digit-checker").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print("💾 Check your data here: https://console.apify.com/storage/datasets/" + run["defaultDatasetId"])
for item in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{}' |
apify call junipr/barcode-check-digit-checker --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "command": "npx",
            "args": [
                "mcp-remote",
                "https://mcp.apify.com/?tools=junipr/barcode-check-digit-checker",
                "--header",
                "Authorization: Bearer <YOUR_API_TOKEN>"
            ]
        }
    }
}

```

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/x6zwgxmy64LFvjQtp/builds/5vItf3WQ1iHWgxbYH/openapi.json