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The Client class is your main entry point for Uplink automation. It manages the WebSocket connection to the Uplink relay server and provides methods for worker and browser management.
Key concepts:
  • Device: A physical iOS or Android device
  • Worker: A worker created using the native Uplink SDK (a device can create multiple workers)
  • Address: A hex-encoded identifier for workers

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Connection

Creates an Uplink session using your project credentials. 
uplink.session(
  apiKey: string,
  options: SessionOptions
): Promise<Session>
Parameters:
  • apiKey: Your project API key from Uplink Console
  • options: Session configuration
    • projectId: Your project ID from Uplink Console
    • include: Cryptographic key options
      • ecdsa: Boolean, include ECDSA keys (default: false)
      • ecdh: Boolean, include ECDH keys (default: false)
Returns: Promise<Session> - Session object to be used with fromSession() Creates a client from an Uplink session. 
uplink.client.fromSession(
  session: Session,
  options?: ClientOptions
): Promise<Client>
Parameters:
  • session: Session object created with uplink.session()
  • options (optional): Connection options
    • agent: Optional AI agent for natural language automation (requires @uplink-code/ai)
Returns: Promise<Client> - Connected client instance Complete example: 
import uplink from '@uplink-code/uplink'

const session = await uplink.session('<project-api-key>', {
  projectId: '<project-id>',
  include: { ecdsa: true, ecdh: true }
})
const client = await uplink.client.fromSession(session)
console.log('Connected to Uplink')
With AI agent: 
import uplink from '@uplink-code/uplink'
import ai from '@uplink-code/ai'

const agent = ai.createAgent({
  provider: 'anthropic',
  options: {
    apiKey: process.env.ANTHROPIC_API_KEY
  }
})

const session = await uplink.session('<project-api-key>', {
  projectId: '<project-id>',
  include: { ecdsa: true, ecdh: true }
})
const client = await uplink.client.fromSession(session, { agent })

// All pages created from this client will have AI capabilities
const browser = await client.launch()
const page = await browser.newPage()

await page.goto('https://example.com')
await page.act('Click the sign in button') // AI-powered action
Connects directly to an Uplink session via WebSocket URL. This is an alternative to using uplink.session() + fromSession(). 
uplink.client.connect(
  url: string | URL,
  options?: ClientOptions
): Promise<Client>
Parameters:
  • url: WebSocket URL in the format wss://relay.uplink.build/session/<jwt>
  • options (optional): Connection options
    • agent: Optional AI agent for natural language automation (requires @uplink-code/ai)
Returns: Promise<Client> - Connected client instance Example: 
import uplink from '@uplink-code/uplink'

const client = await uplink.client.connect(
  'wss://relay.uplink.build/session/<jwt>'
)
console.log('Connected to Uplink')
Recommended approach: Use uplink.session() + fromSession() for better credential management and project organization. Use connect() when you need to work with pre-generated session URLs.

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Browser operations

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client.launch()

Launches a new browser on a worker. If no worker address is provided, uses the first available worker. 
client.launch(address?: Address): Promise<Browser>
Parameters:
  • address (optional): Worker address to launch browser on
Returns: Promise<Browser> - New browser instance Example: 
// Launch on first available worker
const browser = await client.launch()

// Launch on specific worker using its address
const workers = await client.workers()
const browser = await client.launch(workers[0].address)

​
client.connect()

Connects to an existing browser by its handle. 
client.connect(handle: string, address?: Address): Promise<Browser>
Parameters:
  • handle: Browser handle identifier
  • address (optional): Worker address where browser is running
Returns: Promise<Browser> - Connected browser instance Example: 
// Connect to browser by handle (searches all workers)
const workers = await client.workers()
const browsers = await workers[0].browsers()

const existingBrowser = await client.connect(browsers[0].handle)
const page = await existingBrowser.newPage()

​
client.browsers()

Lists all browsers on a worker. 
client.browsers(address?: Address): Promise<Browser[]>
Parameters:
  • address (optional): Worker address to query. If not provided, queries first available worker.
Returns: Promise<Browser[]> - Array of browser instances Example: 
// List browsers on first available worker
const browsers = await client.browsers()
console.log(`${browsers.length} browsers running`)

for (const browser of browsers) {
  console.log('Browser:', browser.handle)
}

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Worker operations

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client.workers()

Returns list of currently connected workers. 
client.workers(): ClientWorker[]
Returns: ClientWorker[] - Array of connected workers Example: 
const workers = client.workers()

console.log(`${workers.length} workers connected`)
workers.forEach(worker => {
  console.log('Worker address:', worker.address)
})

​
client.terminate()

Terminates a worker connection. 
client.terminate(address?: Address): Promise<void>
Parameters:
  • address (optional): Worker address to terminate. If not provided, terminates first available worker.
Returns: Promise<void> Example: 
// Terminate first available worker
await client.terminate()

// Terminate specific worker
await client.terminate(worker.address)
Terminating a worker closes all browsers running on that worker and disconnects the device from the session.

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Connection management

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client.close()

Closes the client connection and cleans up resources. 
client.close(): Promise<void>
Returns: Promise<void> Example: 
await client.close()
Always call close() when done to properly clean up WebSocket connections and resources. Connection time is determined by how long clients and workers are connected to a session.

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Events

The client emits events for worker connection lifecycle.

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worker-connected

Emitted when a new worker connects to the session (i.e., when a device running the Uplink SDK joins). 
client.on(event: 'worker-connected', handler: (worker: ClientWorker) => void)
Example: 
client.on('worker-connected', (worker) => {
  console.log('Worker connected:', worker.address)
})

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worker-disconnected

Emitted when a worker disconnects from the session (i.e., when a device leaves or loses connection). 
client.on(event: 'worker-disconnected', handler: (worker: ClientWorker) => void)
Example: 
client.on('worker-disconnected', (worker) => {
  console.log('Worker disconnected:', worker.address)
})

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Types

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ClientOptions

interface ClientOptions {
  agent?: Agent  // Optional AI agent from @uplink-code/ai
}

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Address

Worker identifier - a hex-encoded address: 
type Address = string  // Hex-encoded worker address

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Complete example

import uplink from '@uplink-code/uplink'

async function main() {
  // Connect to session that will be used for multiple workers doing the same script
  const session = await uplink.session('<project-api-key>', {
    projectId: '<project-id>',
    include: { ecdsa: true, ecdh: true }
  })
  const client = await uplink.client.fromSession(session)

  // Listen for worker events
  client.on('worker-connected', async (worker) => {
    console.log('Worker joined:', worker.address)

    const browser = await worker.launch()
    const page = await browser.newPage()
    await page.goto('https://example.com')

    await page.close()
    await browser.close()
    await client.close()
  })

  client.on('worker-disconnected', (worker) => {
    console.log('Worker left:', worker.address)
  })
}

main().catch(console.error)

ClientWorker

Device-specific operations

Browser

Browser management

Core concepts

Architecture overview

Sessions

Session management