# Vercel AI SDK — Build AI Apps in TypeScript

> Official TypeScript SDK for building AI-powered applications. Unified API for Claude, GPT-4, Gemini with streaming, tool use, structured output, and React hooks. By Vercel. 12,000+ stars.

## Install

Save as a script file and run:

## Quick Use

```bash
npm install ai @ai-sdk/anthropic
```

```typescript
import { generateText } from "ai";
import { anthropic } from "@ai-sdk/anthropic";

const { text } = await generateText({
  model: anthropic("claude-sonnet-4-20250514"),
  prompt: "Explain quantum computing in 3 sentences",
});
console.log(text);
```

Streaming in Next.js:
```typescript
import { streamText } from "ai";

export async function POST(req: Request) {
  const { messages } = await req.json();
  const result = streamText({
    model: anthropic("claude-sonnet-4-20250514"),
    messages,
  });
  return result.toDataStreamResponse();
}
```

---

## Intro

Vercel AI SDK is the official TypeScript SDK for building AI-powered applications with 12,000+ GitHub stars. It provides a unified API across Claude, GPT-4, Gemini, and 20+ providers with streaming, tool use, structured output (JSON schema), and React hooks for chat UIs. Used by Next.js AI Chatbot, v0, and thousands of production apps. Best for TypeScript/React developers building AI features into web applications. Works with: Next.js, React, Svelte, Vue, Node.js. Setup time: under 2 minutes.

---

## Core Functions

### `generateText` — Simple Completion
```typescript
const { text } = await generateText({
  model: anthropic("claude-sonnet-4-20250514"),
  prompt: "Write a haiku about coding",
});
```

### `streamText` — Streaming Response
```typescript
const result = streamText({
  model: anthropic("claude-sonnet-4-20250514"),
  messages: [{ role: "user", content: "Tell me a story" }],
});

for await (const chunk of result.textStream) {
  process.stdout.write(chunk);
}
```

### `generateObject` — Structured Output
```typescript
import { z } from "zod";

const { object } = await generateObject({
  model: anthropic("claude-sonnet-4-20250514"),
  schema: z.object({
    recipe: z.string(),
    ingredients: z.array(z.string()),
    steps: z.array(z.string()),
  }),
  prompt: "Generate a recipe for chocolate cake",
});
// object.recipe, object.ingredients, object.steps — fully typed!
```

### Tool Use
```typescript
const result = await generateText({
  model: anthropic("claude-sonnet-4-20250514"),
  tools: {
    getWeather: {
      description: "Get weather for a location",
      parameters: z.object({ city: z.string() }),
      execute: async ({ city }) => ({ temp: 22, condition: "sunny" }),
    },
  },
  prompt: "What is the weather in Tokyo?",
});
```

### React Hooks (useChat)
```typescript
"use client";
import { useChat } from "ai/react";

export default function Chat() {
  const { messages, input, handleInputChange, handleSubmit } = useChat();

  return (
    <div>
      {messages.map(m => <div key={m.id}>{m.role}: {m.content}</div>)}
      <form onSubmit={handleSubmit}>
        <input value={input} onChange={handleInputChange} />
      </form>
    </div>
  );
}
```

### Provider Adapters

| Provider | Package |
|----------|---------|
| Anthropic | `@ai-sdk/anthropic` |
| OpenAI | `@ai-sdk/openai` |
| Google | `@ai-sdk/google` |
| Mistral | `@ai-sdk/mistral` |
| Cohere | `@ai-sdk/cohere` |
| Amazon Bedrock | `@ai-sdk/amazon-bedrock` |

### Key Stats
- 12,000+ GitHub stars
- By Vercel
- 20+ provider adapters
- Streaming, tools, structured output
- React/Svelte/Vue hooks

### FAQ

**Q: What is Vercel AI SDK?**
A: A TypeScript SDK providing a unified API for building AI features with streaming, tool use, and structured output across 20+ model providers.

**Q: Is it free?**
A: Yes, open-source under Apache 2.0. You provide your own API keys.

**Q: Do I need Next.js?**
A: No, the core SDK works with any Node.js project. The React hooks work with any React app.

---

## Source & Thanks

> Created by [Vercel](https://github.com/vercel). Licensed under Apache 2.0.
>
> [ai](https://github.com/vercel/ai) — stars 12,000+

Thanks to Vercel for standardizing AI development in TypeScript.

---

<!-- ZH -->

## 快速使用

```bash
npm install ai @ai-sdk/anthropic
```

```typescript
import { generateText } from "ai";
import { anthropic } from "@ai-sdk/anthropic";

const { text } = await generateText({
  model: anthropic("claude-sonnet-4-20250514"),
  prompt: "用三句话解释量子计算",
});
```

---

## 简介

Vercel AI SDK 是官方 TypeScript AI 开发 SDK，GitHub 12,000+ stars。为 Claude、GPT-4、Gemini 等 20+ 提供商提供统一 API，支持流式、工具调用、结构化输出和 React Hooks。适合构建 AI 功能的 TypeScript/React 开发者。

---

## 来源与感谢

> Created by [Vercel](https://github.com/vercel). Licensed under Apache 2.0.
>
> [ai](https://github.com/vercel/ai) — stars 12,000+

---
Source: https://tokrepo.com/en/workflows/7a5b5d88-b0a1-409f-906a-d9bd54ad3330
Author: Script Depot