--- title: "QR kodovi za programere: REST API, SDK i CLI — qr3.app Blog" description: "Kako programski generirati QR kodove, integrirati ih u svoju aplikaciju i reagirati na skeniranja putem webhookova — tehnička dubinska analiza." canonical: "https://qr3.app/hr/blog/qr-codes-for-developers/" lang: "hr" robots: "index,follow,max-image-preview:large,max-snippet:-1" --- # QR kodovi za programere: REST API, SDK i CLI — qr3.app Blog > Kako programski generirati QR kodove, integrirati ih u svoju aplikaciju i reagirati na skeniranja putem webhookova — tehnička dubinska analiza. Canonical: [← Blog](/hr/blog/) [Vodiči](/hr/blog/category/tutorials/) 8. ožujka 2026. 8 min čitanja [Vodiči](/hr/blog/category/tutorials/) [API](/hr/blog/tag/API/)[SDK](/hr/blog/tag/SDK/)[Developer](/hr/blog/tag/Developer/)[Webhooks](/hr/blog/tag/Webhooks/) # QR kodovi za programere: REST API, SDK i CLI Kako programski generirati QR kodove, integrirati ih u svoju aplikaciju i reagirati na skeniranja putem webhookova — tehnička dubinska analiza. autor **qr3.app Team** ![QR kodovi za programere: REST API, SDK i CLI](https://qr3-blog-agent.meistern.workers.dev/cdn/blog/qr-codes-for-developers/hero.png) Kao programer ne želite ručno izrađivati QR kodove kroz nadzornu ploču — želite ih generirati automatski, integrirati u svoj build pipeline i reagirati na skeniranja putem webhookova. Upravo zato je qr3.app i stvoren. ## Stack qr3.app je u potpunosti izgrađen na Cloudflareu: - **API Worker**: Hono na Cloudflare Workersima (V8 runtime, bez ijedne Node.js ovisnosti) - **Redirect Worker**: Iznimno lagani worker, preusmjeravanja iz KV cachea u < 5 ms p50 - **Baza podataka**: Cloudflare D1 (SQLite) s podrškom za više korisnika (multi-tenancy) putem `workspace_id` - **Red čekanja (Queue)**: Skeniranja se razdvajaju asinkrono putem Cloudflare Queues ## Autentifikacija Svi API zahtjevi zahtijevaju Bearer token i ID radnog prostora: ``` POST https://qr3.app/v1/codes Authorization: Bearer qr3_sk_... Content-Type: application/json ``` API ključeve kreirajte na [app.qr3.app/dashboard/api-keys](https://app.qr3.app/dashboard/api-keys). ## TypeScript SDK ``` npm install @qr3/sdk # ili pnpm add @qr3/sdk ``` ``` import { QR3 } from "@qr3/sdk"; const client = new QR3({ apiKey: process.env.QR3_API_KEY!, workspaceId: process.env.QR3_WORKSPACE_ID!, }); // Create a QR code const { data: code } = await client.codes.create({ type: "url", url: "https://my-shop.com/product/42", title: "Product 42", tags: ["shop", "product"], }); console.log(code.short_code); // "r7f3Kx" console.log(code.image_svg_url); // SVG image URL console.log(code.redirect_url); // https://qr3.app/r7f3Kx // Change URL later (dynamic codes only) await client.codes.update(code.id, { url: "https://my-shop.com/product/42-new", }); // Query analytics const stats = await client.codes.stats(code.id, { from: "2026-01-01", to: "2026-03-31", }); console.log(stats.data.total_scans); // e.g. 1247 ``` ## Izravni REST API Nemate potrebu za SDK-om? REST API možete koristiti i izravno: ``` # Create a QR code curl -X POST https://qr3.app/v1/codes \ -H "Authorization: Bearer $QR3_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "type": "url", "url": "https://my-site.com", "title": "My Site", "is_dynamic": true }' # List all QR codes curl https://qr3.app/v1/codes?limit=20 \ -H "Authorization: Bearer $QR3_API_KEY" # Upload a logo — embedded automatically in SVG and PNG from here on curl -X POST https://qr3.app/v1/codes/qr_abc123/logo \ -H "Authorization: Bearer $QR3_API_KEY" \ -F "file=@logo.png" # Download QR code as SVG (now includes the logo) curl "https://qr3.app/v1/codes/r7f3Kx/qr.svg?size=8" \ -o qrcode.svg ``` ## CLI Za skriptiranje i CI/CD tu je `@qr3/cli`: ``` npm install -g @qr3/cli qr3 login # Create QR code and save as SVG qr3 codes create --url "https://my-site.com" --title "CI Deploy" --output qr.svg # Batch creation from CSV qr3 codes batch import urls.csv --format svg --output ./qr-codes/ ``` ## Webhookovi: reagirajte na skeniranja Webhookovi su najmoćnija značajka: na svako skeniranje možete reagirati u stvarnom vremenu. ``` // Register a webhook const { data: webhook } = await client.webhooks.create({ url: "https://your-app.com/webhooks/qr3", events: ["qr.scanned", "qr.updated"], }); ``` ### Webhook payload ``` { "id": "evt_4f0c2a91d7e84b3c9a1f", "type": "qr.scanned", "created": "2026-03-15T14:30:00.000Z", "data": { "code_id": "qr_abc123", "short_code": "r7f3Kx", "scanned_at": "2026-03-15T14:30:00.000Z", "country": "DE", "device_type": "mobile", "os": "iOS", "browser": "Safari", "language": "de", "ab_variant": null, "redirected_to": "https://example.com/landing" } } ``` ### Provjera webhookova (HMAC) ``` import { createHmac, timingSafeEqual } from "crypto"; export async function verifyWebhook( payload: string, signature: string, secret: string, ): Promise { const expected = createHmac("sha256", secret) .update(payload) .digest("hex"); const expectedBytes = Buffer.from(`sha256=${expected}`); const receivedBytes = Buffer.from(signature); return ( expectedBytes.length === receivedBytes.length && timingSafeEqual(expectedBytes, receivedBytes) ); } ``` ## Ograničavanje broja zahtjeva (Rate Limiting) Svaki API ključ može poslati 60 zahtjeva u minuti, na svim planovima. Stvaranje kodova također ima dnevno ograničenje po radnom prostoru, koje je isto na svim planovima: `POST /v1/codes` prihvaća nove kodove dok ih se tog dana ne stvori 200, a `POST /v1/codes/batch` do 10.000. Svaki autentificirani odgovor sadrži `X-RateLimit-Limit`. Odgovor `429` dodatno navodi vrijeme kada možete ponovno pokušati: ``` X-RateLimit-Limit: 60 X-RateLimit-Remaining: 0 X-RateLimit-Reset: 1710510060 Retry-After: 60 ``` ## Format pogrešaka (RFC 7807) Sve pogreške slijede [RFC 7807 Problem Details](https://www.rfc-editor.org/rfc/rfc7807): ``` { "type": "https://docs.qr3.app/errors/validation", "title": "Validation Error", "status": 422, "detail": "url is required for type 'url'", "errors": [ { "field": "url", "message": "Required" } ] } ``` ## Zaključak qr3.app je od temelja izgrađen kao alat za programere: otvoreni REST API, TypeScript-first SDK, CLI, webhookovi i potpuna OpenAPI dokumentacija. Pogledajte [API dokumentaciju](https://docs.qr3.app/en/api/) ili krenite odmah u [nadzornoj ploči](https://app.qr3.app/dashboard). [← Svi članci](/hr/blog/) [Počni besplatno](https://app.qr3.app/sign-up)