azure-ai-document-intelligence-ts

# Azure Document Intelligence REST SDK for TypeScript Extract text, tables, and structured data from documents using prebuilt and custom models. ## Installation ```bash npm install @azure-rest/ai-document-intelligence @azure/identity ``` ## Environment Variables ```bash DOCUMENT_INTELLIGENCE_ENDPOINT=https://<resource>.cognitiveservices.azure.com DOCUMENT_INTELLIGENCE_API_KEY=<api-key> ``` ## Authentication **Important**: This is a REST client. `DocumentIntelligence` is a **function**, not a class. ### DefaultAzureCredential ```typescript import DocumentIntelligence from "@azure-rest/ai-document-intelligence"; import { DefaultAzureCredential } from "@azure/identity"; const client = DocumentIntelligence( process.env.DOCUMENT_INTELLIGENCE_ENDPOINT!, new DefaultAzureCredential() ); ``` ### API Key ```typescript import DocumentIntelligence from "@azure-rest/ai-document-intelligence"; const client = DocumentIntelligence( process.env.DOCUMENT_INTELLIGENCE_ENDPOINT!, { key: process.env.DOCUMENT_INTELLIGENCE_API_KEY! } ); ``` ## Analyze Document (URL) ```typescript import DocumentIntelligence, { isUnexpected, getLongRunningPoller, AnalyzeOperationOutput } from "@azure-rest/ai-document-intelligence"; const initialResponse = await client .path("/documentModels/{modelId}:analyze", "prebuilt-layout") .post({ contentType: "application/json", body: { urlSource: "https://example.com/document.pdf" }, queryParameters: { locale: "en-US" } }); if (isUnexpected(initialResponse)) { throw initialResponse.body.error; } const poller = getLongRunningPoller(client, initialResponse); const result = (await poller.pollUntilDone()).body as AnalyzeOperationOutput; console.log("Pages:", result.analyzeResult?.pages?.length); console.log("Tables:", result.analyzeResult?.tables?.length); ``` ## Analyze Document (Local File) ```typescript import { readFile } from "node:fs/promises"; const fileBuffer = await readFile("./document.pdf"); const base64Source = fileBuffer.toString("base64"); const initialResponse = await client .path("/documentModels/{modelId}:analyze", "prebuilt-invoice") .post({ contentType: "application/json", body: { base64Source } }); if (isUnexpected(initialResponse)) { throw initialResponse.body.error; } const poller = getLongRunningPoller(client, initialResponse); const result = (await poller.pollUntilDone()).body as AnalyzeOperationOutput; ``` ## Prebuilt Models | Model ID | Description | |----------|-------------| | `prebuilt-read` | OCR - text and language extraction | | `prebuilt-layout` | Text, tables, selection marks, structure | | `prebuilt-invoice` | Invoice fields | | `prebuilt-receipt` | Receipt fields | | `prebuilt-idDocument` | ID document fields | | `prebuilt-tax.us.w2` | W-2 tax form fields | | `prebuilt-healthInsuranceCard.us` | Health insurance card fields | | `prebuilt-contract` | Contract fields | | `prebuilt-bankStatement.us` | Bank statement fields | ## Extract Invoice Fields ```typescript const initialResponse = await client .path("/documentModels/{modelId}:analyze", "prebuilt-invoice") .post({ contentType: "application/json", body: { urlSource: invoiceUrl } }); if (isUnexpected(initialResponse)) { throw initialResponse.body.error; } const poller = getLongRunningPoller(client, initialResponse); const result = (await poller.pollUntilDone()).body as AnalyzeOperationOutput; const invoice = result.analyzeResult?.documents?.[0]; if (invoice) { console.log("Vendor:", invoice.fields?.VendorName?.content); console.log("Total:", invoice.fields?.InvoiceTotal?.content); console.log("Due Date:", invoice.fields?.DueDate?.content); } ``` ## Extract Receipt Fields ```typescript const initialResponse = await client .path("/documentModels/{modelId}:analyze", "prebuilt-receipt") .post({ contentType: "application/json", body: { urlSource: receiptUrl } }); const poller = getLongRunningPoller(client, initialResponse); const result = (await poller.pollUntilDone()).body as AnalyzeOperationOutput; const receipt = result.analyzeResult?.documents?.[0]; if (receipt) { console.log("Merchant:", receipt.fields?.MerchantName?.content); console.log("Total:", receipt.fields?.Total?.content); for (const item of receipt.fields?.Items?.values || []) { console.log("Item:", item.properties?.Description?.content); console.log("Price:", item.properties?.TotalPrice?.content); } } ``` ## List Document Models ```typescript import DocumentIntelligence, { isUnexpected, paginate } from "@azure-rest/ai-document-intelligence"; const response = await client.path("/documentModels").get(); if (isUnexpected(response)) { throw response.body.error; } for await (const model of paginate(client, response)) { console.log(model.modelId); } ``` ## Build Custom Model ```typescript const initialResponse = await client.path("/documentModels:build").post({ body: { modelId: "my-custom-model", description: "Custom model for purchase orders", buildMode: "template", // or "neural" azureBlobSource: { containerUrl: process.env.TRAINING_CONTAINER_SAS_URL!, prefix: "training-data/" } } }); if (isUnexpected(initialResponse)) { throw initialResponse.body.error; } const poller = getLongRunningPoller(client, initialResponse); const result = await poller.pollUntilDone(); console.log("Model built:", result.body); ``` ## Build Document Classifier ```typescript import { DocumentClassifierBuildOperationDetailsOutput } from "@azure-rest/ai-document-intelligence"; const containerSasUrl = process.env.TRAINING_CONTAINER_SAS_URL!; const initialResponse = await client.path("/documentClassifiers:build").post({ body: { classifierId: "my-classifier", description: "Invoice vs Receipt classifier", docTypes: { invoices: { azureBlobSource: { containerUrl: containerSasUrl, prefix: "invoices/" } }, receipts: { azureBlobSource: { containerUrl: containerSasUrl, prefix: "receipts/" } } } } }); if (isUnexpected(initialResponse)) { throw initialResponse.body.error; } const poller = getLongRunningPoller(client, initialResponse); const result = (await poller.pollUntilDone()).body as DocumentClassifierBuildOperationDetailsOutput; console.log("Classifier:", result.result?.classifierId); ``` ## Classify Document ```typescript const initialResponse = await client .path("/documentClassifiers/{classifierId}:analyze", "my-classifier") .post({ contentType: "application/json", body: { urlSource: documentUrl }, queryParameters: { split: "auto" } }); if (isUnexpected(initialResponse)) { throw initialResponse.body.error; } const poller = getLongRunningPoller(client, initialResponse); const result = await poller.pollUntilDone(); console.log("Classification:", result.body.analyzeResult?.documents); ``` ## Get Service Info ```typescript const response = await client.path("/info").get(); if (isUnexpected(response)) { throw response.body.error; } console.log("Custom model limit:", response.body.customDocumentModels.limit); console.log("Custom model count:", response.body.customDocumentModels.count); ``` ## Polling Pattern ```typescript import DocumentIntelligence, { isUnexpected, getLongRunningPoller, AnalyzeOperationOutput } from "@azure-rest/ai-document-intelligence"; // 1. Start operation const initialResponse = await client .path("/documentModels/{modelId}:analyze", "prebuilt-layout") .post({ contentType: "application/json", body: { urlSource } }); // 2. Check for errors if (isUnexpected(initialResponse)) { throw initialResponse.body.error; } // 3. Create poller const poller = getLongRunningPoller(client, initialResponse); // 4. Optional: Monitor progress poller.onProgress((state) => { console.log("Status:", state.status); }); // 5. Wait for completion const result = (await poller.pollUntilDone()).body as AnalyzeOperationOutput; ``` ## Key Types ```typescript import DocumentIntelligence, { isUnexpected, getLongRunningPoller, paginate, parseResultIdFromResponse, AnalyzeOperationOutput, DocumentClassifierBuildOperationDetailsOutput } from "@azure-rest/ai-document-intelligence"; ``` ## Best Practices 1. **Use getLongRunningPoller()** - Document analysis is async, always poll for results 2. **Check isUnexpected()** - Type guard for proper error handling 3. **Choose the right model** - Use prebuilt models when possible, custom for specialized docs 4. **Handle confidence scores** - Fields have confidence values, set thresholds for your use case 5. **Use pagination** - Use `paginate()` helper for listing models 6. **Prefer neural mode** - For custom models, neural handles more variation than template ## When to Use Extract text, tables, and structured data from documents using Azure Document Intelligence (@azure-rest/ai-document-intelligence). Use when processing invoices, receipts, IDs, forms, or building custom document models. Covers: Azure Document Intelligence REST SDK for TypeScript, Environment Variables, Authentication, DefaultAzureCredential, API Key.