JavaScript SDK Overview

The JavaScript/TypeScript SDKs provide comprehensive access to Azure AI services for both Node.js and browser environments. This guide covers installation, authentication, and usage examples.

Installation

Azure AI Foundry SDK

npm install @azure/ai-projects@beta @azure/identity dotenv

Foundry Local SDK

Node.js
Browser

npm install foundry-local-sdk

npm install foundry-local-sdk

Import from: foundry-local-sdk/browser

Azure AI Search

npm install @azure/search-documents @azure/identity

Azure AI Services

npm install microsoft-cognitiveservices-speech-sdk
npm install @azure/ai-content-safety @azure/identity

Authentication

All SDKs support Azure Active Directory authentication:

import { DefaultAzureCredential } from "@azure/identity";

const credential = new DefaultAzureCredential();

Ensure you’re authenticated with Azure CLI: az login

Azure AI Foundry

Project Client

Connect to your Azure AI Foundry project:

import { DefaultAzureCredential } from "@azure/identity";
import { AIProjectClient } from "@azure/ai-projects";
import "dotenv/config";

const projectEndpoint = "https://<resource-name>.services.ai.azure.com/api/projects/<project-name>";
const deploymentName = "gpt-5.2";

const project = new AIProjectClient(projectEndpoint, new DefaultAzureCredential());

Chat Completions

Use the OpenAI-compatible client:

const openAIClient = await project.getOpenAIClient();

const response = await openAIClient.responses.create({
    model: deploymentName,
    input: "What is the size of France in square miles?",
});

console.log(`Response output: ${response.output_text}`);

Streaming Responses

const stream = await openAIClient.responses.create({
    model: deploymentName,
    input: "Explain quantum computing",
    stream: true,
});

for await (const chunk of stream) {
    if (chunk.choices[0]?.delta?.content) {
        process.stdout.write(chunk.choices[0].delta.content);
    }
}

List Connections

const connections = project.connections.list();

for await (const connection of connections) {
    console.log(`Connection: ${connection.name}`);
    console.log(`Type: ${connection.connectionType}`);
}

Foundry Local

Initialize Manager (Node.js)

import { FoundryLocalManager } from "foundry-local-sdk";

const alias = "qwen2.5-0.5b";

// Initialize and load model
const manager = new FoundryLocalManager();
const modelInfo = await manager.init(alias);

console.log("Model Info:", modelInfo);
console.log(`Service URL: ${manager.serviceUrl}`);
console.log(`Endpoint: ${manager.endpoint}`);

List and Download Models

// Check service status
const isRunning = await manager.isServiceRunning();
console.log(`Service running: ${isRunning}`);

// List available models in catalog
const catalog = await manager.listCatalogModels();
console.log(`Available models: ${catalog.length}`);

// Get specific model info
const model = await manager.getModelInfo("qwen2.5-0.5b");

if (model) {
    console.log(`Model: ${model.displayName}`);
    console.log(`Size: ${model.fileSizeMb} MB`);
    console.log(`Task: ${model.task}`);
    console.log(`Supports tools: ${model.supportsToolCalling}`);
}

// Download model
await manager.downloadModel(alias);

// Load model into memory
await manager.loadModel(alias, 600); // TTL in seconds

Model Management

// Get cache location
const cacheLocation = await manager.getCacheLocation();
console.log(`Cache: ${cacheLocation}`);

// List cached models
const cachedModels = await manager.listCachedModels();
cachedModels.forEach(model => {
    console.log(`Cached: ${model.alias} (${model.fileSizeMb} MB)`);
});

// List loaded models
const loadedModels = await manager.listLoadedModels();
loadedModels.forEach(model => {
    console.log(`Loaded: ${model.displayName}`);
});

// Unload model
await manager.unloadModel(alias);

OpenAI Integration

Use Foundry Local with the OpenAI SDK:

import { OpenAI } from "openai";
import { FoundryLocalManager } from "foundry-local-sdk";

const alias = "qwen2.5-0.5b";

// Initialize Foundry Local
const foundryLocalManager = new FoundryLocalManager();
const modelInfo = await foundryLocalManager.init(alias);

// Configure OpenAI client
const openai = new OpenAI({
    baseURL: foundryLocalManager.endpoint,
    apiKey: foundryLocalManager.apiKey,
});

// Stream completion
async function streamCompletion() {
    const stream = await openai.chat.completions.create({
        model: modelInfo.id,
        messages: [{ role: "user", content: "What is the golden ratio?" }],
        stream: true,
    });

    for await (const chunk of stream) {
        if (chunk.choices[0]?.delta?.content) {
            process.stdout.write(chunk.choices[0].delta.content);
        }
    }
}

await streamCompletion();

Browser Usage

For browser environments, manually specify the host:

import { FoundryLocalManager } from "foundry-local-sdk/browser";

// Start service first with CLI: foundry service start
const host = "http://localhost:5272"; // From CLI output

const manager = new FoundryLocalManager({ host });

// Get models
const catalog = await manager.listCatalogModels();
console.log("Available models:", catalog);

// Download and load
const alias = "qwen2.5-0.5b";
await manager.downloadModel(alias);
await manager.loadModel(alias);

// Use with OpenAI client
const openai = new OpenAI({
    baseURL: manager.endpoint,
    apiKey: manager.apiKey,
    dangerouslyAllowBrowser: true
});

In browser version, init(), isServiceRunning(), and startService() are not available. Start the service using the Foundry Local CLI.

Azure AI Search

Search Client

import { SearchClient, AzureKeyCredential } from "@azure/search-documents";
import { DefaultAzureCredential } from "@azure/identity";

const endpoint = "https://<search-service>.search.windows.net";
const indexName = "your-index";

const searchClient = new SearchClient(
    endpoint,
    indexName,
    new DefaultAzureCredential()
);

Full-Text Search

const results = await searchClient.search("Phoenix urban development", {
    select: ["id", "page_chunk", "page_number"],
    top: 5
});

for await (const result of results.results) {
    console.log(`Score: ${result.score}`);
    console.log(`Content: ${result.document.page_chunk}`);
    console.log(`Page: ${result.document.page_number}\n`);
}

Vector Search

import { VectorizedQuery } from "@azure/search-documents";

// Generate embedding (using your embedding function)
const queryVector = await generateEmbedding("Phoenix metropolitan area");

const vectorQuery: VectorizedQuery = {
    kind: "vector",
    vector: queryVector,
    kNearestNeighborsCount: 5,
    fields: ["page_embedding_text_3_large"]
};

const results = await searchClient.search(null, {
    vectorQueries: [vectorQuery],
    select: ["id", "page_chunk", "page_number"]
});

for await (const result of results.results) {
    console.log(`Content: ${result.document.page_chunk}`);
}

Hybrid Search

const results = await searchClient.search("Phoenix urban grid", {
    vectorQueries: [vectorQuery],
    select: ["id", "page_chunk", "page_number"],
    top: 5
});

for await (const result of results.results) {
    console.log(`Score: ${result.score}`);
    console.log(`Content: ${result.document.page_chunk}\n`);
}

Upload Documents

const documents = [
    {
        id: "doc1",
        page_chunk: "Phoenix is a major city in Arizona.",
        page_number: 104
    },
    {
        id: "doc2",
        page_chunk: "The Phoenix metropolitan area includes Glendale.",
        page_number: 105
    }
];

const result = await searchClient.uploadDocuments(documents);
console.log(`Uploaded ${result.results.length} documents`);

Azure AI Services

Speech Recognition

import * as sdk from "microsoft-cognitiveservices-speech-sdk";

const speechConfig = sdk.SpeechConfig.fromSubscription("your-key", "your-region");
const audioConfig = sdk.AudioConfig.fromWavFileInput("audio.wav");

const recognizer = new sdk.SpeechRecognizer(speechConfig, audioConfig);

recognizer.recognizeOnceAsync(
    result => {
        if (result.reason === sdk.ResultReason.RecognizedSpeech) {
            console.log(`Recognized: ${result.text}`);
        }
        recognizer.close();
    },
    error => {
        console.error(`Error: ${error}`);
        recognizer.close();
    }
);

Speech Synthesis

const speechConfig = sdk.SpeechConfig.fromSubscription("your-key", "your-region");
speechConfig.speechSynthesisVoiceName = "en-US-AriaNeural";

const synthesizer = new sdk.SpeechSynthesizer(speechConfig);

synthesizer.speakTextAsync(
    "Hello, world!",
    result => {
        if (result.reason === sdk.ResultReason.SynthesizingAudioCompleted) {
            console.log("Speech synthesized successfully");
        }
        synthesizer.close();
    },
    error => {
        console.error(`Error: ${error}`);
        synthesizer.close();
    }
);

Content Safety

import { ContentSafetyClient, AnalyzeTextOptions } from "@azure-rest/ai-content-safety";
import { DefaultAzureCredential } from "@azure/identity";

const endpoint = "https://<resource>.cognitiveservices.azure.com";

const client = ContentSafetyClient(
    endpoint,
    new DefaultAzureCredential()
);

const request: AnalyzeTextOptions = {
    body: {
        text: "Sample text to analyze"
    }
};

const response = await client.path("/text:analyze").post(request);

if (response.status === "200") {
    const result = response.body;
    console.log(`Hate: ${result.hateResult?.severity}`);
    console.log(`Violence: ${result.violenceResult?.severity}`);
}

Error Handling

import { RestError } from "@azure/core-rest-pipeline";

try {
    const results = await searchClient.search("query");
} catch (error) {
    if (error instanceof RestError) {
        console.error(`HTTP ${error.statusCode}: ${error.message}`);
        
        if (error.statusCode === 404) {
            console.error("Index not found");
        }
    } else {
        console.error(`Unexpected error: ${error}`);
    }
}

TypeScript Types

Leverage TypeScript for type safety:

interface SearchDocument {
    id: string;
    page_chunk: string;
    page_number: number;
    page_embedding_text_3_large?: number[];
}

const searchClient = new SearchClient<SearchDocument>(
    endpoint,
    indexName,
    credential
);

const results = await searchClient.search("query");

for await (const result of results.results) {
    // TypeScript knows the document shape
    const doc: SearchDocument = result.document;
    console.log(doc.page_chunk);
}

Best Practices

Environment Variables

Use environment variables for configuration:

import "dotenv/config";

const endpoint = process.env.AZURE_SEARCH_ENDPOINT!;
const indexName = process.env.AZURE_SEARCH_INDEX!;

Create .env file:

AZURE_SEARCH_ENDPOINT=https://your-service.search.windows.net
AZURE_SEARCH_INDEX=your-index

Async/Await

Always use async/await with proper error handling:

async function searchDocuments() {
    try {
        const results = await searchClient.search("query");
        return results;
    } catch (error) {
        console.error("Search failed:", error);
        throw error;
    }
}

Client Reuse

Reuse client instances for better performance:

// Good: Create once, use multiple times
const client = new SearchClient(...);

for (const query of queries) {
    await client.search(query);
}

// Bad: Create new client each time
for (const query of queries) {
    const client = new SearchClient(...);
    await client.search(query);
}

Package References

Package	npm	Documentation
@azure/ai-projects	Link	Docs
foundry-local-sdk	Link	Docs
@azure/search-documents	Link	Docs
microsoft-cognitiveservices-speech-sdk	Link	Docs

REST API

Foundry REST API documentation

Python SDK

Python SDK reference

.NET SDK

C# and .NET SDK documentation

TypeScript Guide

TypeScript documentation

Documentation Index

​JavaScript SDK Overview

​Installation

​Azure AI Foundry SDK

​Foundry Local SDK

​Azure AI Search

​Azure AI Services

​Authentication

​Azure AI Foundry

​Project Client

​Chat Completions

​Streaming Responses

​List Connections

​Foundry Local

​Initialize Manager (Node.js)

​List and Download Models

​Model Management

​OpenAI Integration

​Browser Usage

​Azure AI Search

​Search Client

​Full-Text Search

​Vector Search

​Hybrid Search

​Upload Documents

​Azure AI Services

​Speech Recognition

​Speech Synthesis

​Content Safety

​Error Handling

​TypeScript Types

​Best Practices

​Package References

​Related Resources

REST API

Python SDK

.NET SDK

TypeScript Guide

JavaScript SDK Overview

Installation

Azure AI Foundry SDK

Foundry Local SDK

Azure AI Search

Azure AI Services

Authentication

Azure AI Foundry

Project Client

Chat Completions

Streaming Responses

List Connections

Foundry Local

Initialize Manager (Node.js)

List and Download Models

Model Management

OpenAI Integration

Browser Usage

Azure AI Search

Search Client

Full-Text Search

Vector Search

Hybrid Search

Upload Documents

Azure AI Services

Speech Recognition

Speech Synthesis

Content Safety

Error Handling

TypeScript Types

Best Practices

Package References

Related Resources