---
name: javascript-sdk
description: "JavaScript/TypeScript SDK for inference.sh - run AI apps, build agents, integrate with all models. Package: @inferencesh/sdk (npm install). Full TypeScript support, streaming, file uploads. Build agents with template or ad-hoc patterns, tool builder API, skills, human approval. Use for: JavaScript integration, TypeScript, Node.js, React, Next.js, frontend apps. Triggers: javascript sdk, typescript sdk, npm install, node.js api, js client, react ai, next.js ai, frontend sdk, @inferencesh/sdk, typescript agent, browser sdk, js integration"
allowed-tools: Bash(npm *), Bash(npx *), Bash(node *), Bash(pnpm *), Bash(yarn *)
---
> **Install the belt CLI skill:** `npx skills add belt-sh/cli`
# JavaScript SDK
Build AI applications with the [inference.sh](https://inference.sh) JavaScript/TypeScript SDK.
## Quick Start
```bash
npm install @inferencesh/sdk
```
```typescript
import { inference } from '@inferencesh/sdk';
const client = inference({ apiKey: 'inf_your_key' });
// Run an AI app
const result = await client.run({
app: 'infsh/flux-schnell',
input: { prompt: 'A sunset over mountains' }
});
console.log(result.output);
```
## Installation
```bash
npm install @inferencesh/sdk
# or
yarn add @inferencesh/sdk
# or
pnpm add @inferencesh/sdk
```
**Requirements:** Node.js 18.0.0+ (or modern browser with fetch)
## Authentication
```typescript
import { inference } from '@inferencesh/sdk';
// Direct API key
const client = inference({ apiKey: 'inf_your_key' });
// From environment variable (recommended)
const client = inference({ apiKey: process.env.INFERENCE_API_KEY });
// For frontend apps (use proxy)
const client = inference({ proxyUrl: '/api/inference/proxy' });
```
Get your API key: Settings → API Keys → Create API Key
## Running Apps
### Basic Execution
```typescript
const result = await client.run({
app: 'infsh/flux-schnell',
input: { prompt: 'A cat astronaut' }
});
console.log(result.status); // "completed"
console.log(result.output); // Output data
```
### Fire and Forget
```typescript
const task = await client.run({
app: 'google/veo-3-1-fast',
input: { prompt: 'Drone flying over mountains' }
}, { wait: false });
console.log(`Task ID: ${task.id}`);
// Check later with client.getTask(task.id)
```
### Streaming Progress
```typescript
const stream = await client.run({
app: 'google/veo-3-1-fast',
input: { prompt: 'Ocean waves at sunset' }
}, { stream: true });
for await (const update of stream) {
console.log(`Status: ${update.status}`);
if (update.logs?.length) {
console.log(update.logs.at(-1));
}
}
```
### Run Parameters
| Parameter | Type | Description |
|-----------|------|-------------|
| `app` | string | App ID (namespace/name@version) |
| `input` | object | Input matching app schema |
| `setup` | object | Hidden setup configuration |
| `infra` | string | 'cloud' or 'private' |
| `session` | string | Session ID for stateful execution |
| `session_timeout` | number | Idle timeout (1-3600 seconds) |
## File Handling
### Automatic Upload
```typescript
const result = await client.run({
app: 'image-processor',
input: {
image: '/path/to/image.png' // Auto-uploaded
}
});
```
### Manual Upload
```typescript
// Basic upload
const file = await client.uploadFile('/path/to/image.png');
// With options
const file = await client.uploadFile('/path/to/image.png', {
filename: 'custom_name.png',
contentType: 'image/png',
public: true
});
const result = await client.run({
app: 'image-processor',
input: { image: file.uri }
});
```
### Browser File Upload
```typescript
const input = document.querySelector('input[type="file"]');
const file = await client.uploadFile(input.files[0]);
```
## Sessions (Stateful Execution)
Keep workers warm across multiple calls:
```typescript
// Start new session
const result = await client.run({
app: 'my-app',
input: { action: 'init' },
session: 'new',
session_timeout: 300 // 5 minutes
});
const sessionId = result.session_id;
// Continue in same session
const result2 = await client.run({
app: 'my-app',
input: { action: 'process' },
session: sessionId
});
```
## Agent SDK
### Template Agents
Use pre-built agents from your workspace:
```typescript
const agent = client.agent('my-team/support-agent@latest');
// Send message
const response = await agent.sendMessage('Hello!');
console.log(response.text);
// Multi-turn conversation
const response2 = await agent.sendMessage('Tell me more');
// Reset conversation
agent.reset();
// Get chat history
const chat = await agent.getChat();
```
### Ad-hoc Agents
Create custom agents programmatically:
```typescript
import { tool, string, number, appTool } from '@inferencesh/sdk';
// Define tools
const calculator = tool('calculate')
.describe('Perform a calculation')
.param('expression', string('Math expression'))
.build();
const imageGen = appTool('generate_image', 'infsh/flux-schnell@latest')
.describe('Generate an image')
.param('prompt', string('Image description'))
.build();
// Create agent
const agent = client.agent({
core_app: { ref: 'infsh/claude-sonnet-4@latest' },
system_prompt: 'You are a helpful assistant.',
tools: [calculator, imageGen],
temperature: 0.7,
max_tokens: 4096
});
const response = await agent.sendMessage('What is 25 * 4?');
```
### Available Core Apps
| Model | App Reference |
|-------|---------------|
| Claude Sonnet 4 | `infsh/claude-sonnet-4@latest` |
| Claude 3.5 Haiku | `infsh/claude-haiku-35@latest` |
| GPT-4o | `infsh/gpt-4o@latest` |
| GPT-4o Mini | `infsh/gpt-4o-mini@latest` |
## Tool Builder API
### Parameter Types
```typescript
import {
string, number, integer, boolean,
enumOf, array, obj, optional
} from '@inferencesh/sdk';
const name = string('User\'s name');
const age = integer('Age in years');
const score = number('Score 0-1');
const active = boolean('Is active');
const priority = enumOf(['low', 'medium', 'high'], 'Priority');
const tags = array(string('Tag'), 'List of tags');
const address = obj({
street: string('Street'),
city: string('City'),
zip: optional(string('ZIP'))
}, 'Address');
```
### Client Tools (Run in Your Code)
```typescript
const greet = tool('greet')
.display('Greet User')
.describe('Greets a user by name')
.param('name', string('Name to greet'))
.requireApproval()
.build();
```
### App Tools (Call AI Apps)
```typescript
const generate = appTool('generate_image', 'infsh/flux-schnell@latest')
.describe('Generate an image from text')
.param('prompt', string('Image description'))
.setup({ model: 'schnell' })
.input({ steps: 20 })
.requireApproval()
.build();
```
### Agent Tools (Delegate to Sub-agents)
```typescript
import { agentTool } from '@inferencesh/sdk';
const researcher = agentTool('research', 'my-org/researcher@v1')
.describe('Research a topic')
.param('topic', string('Topic to research'))
.build();
```
### Webhook Tools (Call External APIs)
```typescript
import { webhookTool } from '@inferencesh/sdk';
const notify = webhookTool('slack', 'https://hooks.slack.com/...')
.describe('Send Slack notification')
.secret('SLACK_SECRET')
.param('channel', string('Channel'))
.param('message', string('Message'))
.build();
```
### Internal Tools (Built-in Capabilities)
```typescript
import { internalTools } from '@inferencesh/sdk';
const config = internalTools()
.plan()
.memory()
.webSearch(true)
.codeExecution(true)
.imageGeneration({
enabled: true,
appRef: 'infsh/flux@latest'
})
.build();
const agent = client.agent({
core_app: { ref: 'infsh/claude-sonnet-4@latest' },
internal_tools: config
});
```
## Streaming Agent Responses
```typescript
const response = await agent.sendMessage('Explain quantum computing', {
onMessage: (msg) => {
if (msg.content) {
process.stdout.write(msg.content);
}
},
onToolCall: async (call) => {
console.log(`\n[Tool: ${call.name}]`);
const result = await executeTool(call.name, call.args);
agent.submitToolResult(call.id, result);
}
});
```
## File Attachments
```typescript
// From file path (Node.js)
import { readFileSync } from 'fs';
const response = await agent.sendMessage('What\'s in this image?', {
files: [readFileSync('image.png')]
});
// From base64
const response = await agent.sendMessage('Analyze this', {
files: ['data:image/png;base64,iVBORw0KGgo...']
});
// From browser File object
const input = document.querySelector('input[type="file"]');
const response = await agent.sendMessage('Describe this', {
files: [input.files[0]]
});
```
## Skills (Reusable Context)
```typescript
const agent = client.agent({
core_app: { ref: 'infsh/claude-sonnet-4@latest' },
skills: [
{
name: 'code-review',
description: 'Code review guidelines',
content: '# Code Review\n\n1. Check security\n2. Check performance...'
},
{
name: 'api-docs',
description: 'API documentation',
url: 'https://example.com/skills/api-docs.md'
}
]
});
```
## Server Proxy (Frontend Apps)
For browser apps, proxy through your backend to keep API keys secure:
### Client Setup
```typescript
const client = inference({
proxyUrl: '/api/inference/proxy'
// No apiKey needed on frontend
});
```
### Next.js Proxy (App Router)
```typescript
// app/api/inference/proxy/route.ts
import { createRouteHandler } from '@inferencesh/sdk/proxy/nextjs';
const route = createRouteHandler({
apiKey: process.env.INFERENCE_API_KEY
});
export const POST = route.POST;
```
### Express Proxy
```typescript
import express from 'express';
import { createProxyMiddleware } from '@inferencesh/sdk/proxy/express';
const app = express();
app.use('/api/inference/proxy', createProxyMiddleware({
apiKey: process.env.INFERENCE_API_KEY
}));
```
### Supported Frameworks
- Next.js (App Router & Pages Router)
- Express
- Hono
- Remix
- SvelteKit
## TypeScript Support
Full type definitions included:
```typescript
import type {
TaskDTO,
ChatDTO,
ChatMessageDTO,
AgentTool,
TaskStatusCompleted,
TaskStatusFailed
} from '@inferencesh/sdk';
if (result.status === TaskStatusCompleted) {
console.log('Done!');
} else if (result.status === TaskStatusFailed) {
console.log('Failed:', result.error);
}
```
## Error Handling
```typescript
import { RequirementsNotMetException, InferenceError } from '@inferencesh/sdk';
try {
const result = await client.run({ app: 'my-app', input: {...} });
} catch (e) {
if (e instanceof RequirementsNotMetException) {
console.log('Missing requirements:');
for (const err of e.errors) {
console.log(` - ${err.type}: ${err.key}`);
}
} else if (e instanceof InferenceError) {
console.log('API error:', e.message);
}
}
```
## Human Approval Workflows
```typescript
const response = await agent.sendMessage('Delete all temp files', {
onToolCall: async (call) => {
if (call.requiresApproval) {
const approved = await promptUser(`Allow ${call.name}?`);
if (approved) {
const result = await executeTool(call.name, call.args);
agent.submitToolResult(call.id, result);
} else {
agent.submitToolResult(call.id, { error: 'Denied by user' });
}
}
}
});
```
## CommonJS Support
```javascript
const { inference, tool, string } = require('@inferencesh/sdk');
const client = inference({ apiKey: 'inf_...' });
const result = await client.run({...});
```
## Reference Files
- [Agent Patterns](references/agent-patterns.md) - Multi-agent, RAG, batch processing patterns
- [Tool Builder](references/tool-builder.md) - Complete tool builder API reference
- [Server Proxy](references/server-proxy.md) - Next.js, Express, Hono, Remix, SvelteKit setup
- [Streaming](references/streaming.md) - Real-time progress updates and SSE handling
- [File Handling](references/files.md) - Upload, download, and manage files
- [Sessions](references/sessions.md) - Stateful execution with warm workers
- [TypeScript](references/typescript.md) - Type definitions and type-safe patterns
- [React Integration](references/react-integration.md) - Hooks, components, and patterns
## Related Skills
```bash
# Python SDK
npx skills add inference-sh/skills@python-sdk
# Full platform skill (all apps via CLI)
npx skills add inference-sh/skills@infsh-cli
# LLM models
npx skills add inference-sh/skills@llm-models
# Image generation
npx skills add inference-sh/skills@ai-image-generation
```
## Documentation
- [JavaScript SDK Reference](https://inference.sh/docs/api/sdk-javascript) - Full API documentation
- [Agent SDK Overview](https://inference.sh/docs/api/agent-sdk) - Building agents
- [Tool Builder Reference](https://inference.sh/docs/api/infsh-cli) - Creating tools
- [Server Proxy Setup](https://inference.sh/docs/api/sdk/server-proxy) - Frontend integration
- [Authentication](https://inference.sh/docs/api/authentication) - API key setup
- [Streaming](https://inference.sh/docs/api/sdk/streaming) - Real-time updates
- [File Uploads](https://inference.sh/docs/api/sdk/files) - File handling