Apify output contract checks by Check Charlie
Pricing
$0.01 / completed report
Check up to 20 supplied JSON rows for missing fields, incorrect types, duplicate IDs and timestamp inconsistencies. Exact failing rows in JSON and Markdown. Deterministic checks, no AI model or target Actor calls. $0.01/completed report; no certification.
You can access the Apify output contract checks by Check Charlie programmatically from your own applications by using the Apify API. You can also choose the language preference from below. To use the Apify API, you’ll need an Apify account and your API token, found in API & Integrations in Apify Console.
1import { ApifyClient } from 'apify-client';2
3// Initialize the ApifyClient with your Apify API token4// Replace the '<YOUR_API_TOKEN>' with your token5const client = new ApifyClient({6 token: '<YOUR_API_TOKEN>',7});8
9// Prepare Actor input10const input = {11 "bundle": {12 "schemaVersion": 1,13 "actorUrl": "https://apify.com/example/demo",14 "declaredBuild": "demo-1",15 "contract": {16 "fields": [17 {18 "path": "id",19 "type": "string",20 "required": true,21 "unique": true22 },23 {24 "path": "views",25 "type": "number",26 "required": true27 },28 {29 "path": "observedAt",30 "type": "string",31 "required": true,32 "timestamp": true33 }34 ],35 "maxItems": 2036 },37 "sample": [38 {39 "id": "fictional-1",40 "views": 12,41 "observedAt": "2026-10-01T09:00:00Z"42 },43 {44 "id": "fictional-1",45 "views": "14",46 "observedAt": "not-a-date"47 }48 ]49 }50};51
52// Run the Actor and wait for it to finish53const run = await client.actor("automatron/check-charlie-output-qa").call(input);54
55// Fetch and print Actor results from the run's dataset (if any)56console.log('Results from dataset');57console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);58const { items } = await client.dataset(run.defaultDatasetId).listItems();59items.forEach((item) => {60 console.dir(item);61});62
63// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docsThe Apify API client for JavaScript is the official library that allows you to use Apify output contract checks by Check Charlie API in JavaScript or TypeScript, providing convenience functions and automatic retries on errors.
Install the apify-client
$npm install apify-clientOther API clients include: