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Sessions are the foundation of Uplink’s security and connection model. Understanding how to create, manage, and secure sessions is essential for production use.

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What is a session?

A session is an authenticated connection that allows your JavaScript code to communicate with mobile devices. Sessions are created programmatically using your project API key and enable secure, real-time bidirectional communication. 
const session = await uplink.session('<project-api-key>', {
  projectId: '<project-id>',
  include: { ecdsa: true, ecdh: true }
})
const client = await uplink.client.fromSession(session)

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Creating sessions

Sessions are created programmatically in your code using your project API key and project ID.
1

Get your credentials

In Uplink Console, navigate to Settings → API Keys to find your project API key and project ID. Keep these credentials secure.
2

Create a session in code

Use the uplink.session() method to create a session with your credentials:
const session = await uplink.session('<project-api-key>', {
  projectId: '<project-id>',
  include: { ecdsa: true, ecdh: true }
})
3

Connect a client to the session

Create a client from your session to interact with connected devices:
const client = await uplink.client.fromSession(session)

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API keys and session security

Sessions are authenticated using your project API key, which provides:
  • Project identity: Links sessions to your Uplink project
  • Project scope: Sessions are associated with a specific project ID
  • Secure communication: Encrypted connections between your code and devices
  • Access control: Manage permissions through Console settings

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Token security best practices

Treat API keys like passwords. Never commit them to source control or expose them in client-side code.
// ✓ Good: Use environment variables
const session = await uplink.session(process.env.UPLINK_API_KEY, {
  projectId: process.env.UPLINK_PROJECT_ID,
  include: { ecdsa: true, ecdh: true }
})

// ✗ Bad: Hardcoded credentials
const session = await uplink.session('sk_live_abc123...', {
  projectId: 'proj_xyz789',
  include: { ecdsa: true, ecdh: true }
})
Create and destroy sessions as needed for your use case. For automated testing, create a new session for each test run and close it when complete.
// Create session for a test
const session = await uplink.session(process.env.UPLINK_API_KEY, {
  projectId: process.env.UPLINK_PROJECT_ID,
  include: { ecdsa: true, ecdh: true }
})
const client = await uplink.client.fromSession(session)

// Run tests...

// Always clean up
await client.close()
Use different project IDs to isolate different environments or use cases. This helps organize your automations and manage access control.
Regularly rotate API keys, especially after team member changes or security incidents. You can manage keys in the Uplink Console.

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Session lifecycle

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Connection

When you connect to a session, the client establishes a WebSocket connection to the Uplink relay server: 
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 session')

// The client is now ready to interact with devices

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Active session

During an active session:
  • Devices can connect and disconnect
  • Browsers can be launched and managed
  • Commands are sent in real-time
  • Events are emitted for device state changes
client.on('worker-connected', (device) => {
  console.log('Device joined session:', device.address)
})

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

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Closing a session

Always close the client when you’re done to properly clean up resources: 
// Clean up in order: pages, browsers, then client
await page.close()
await browser.close()
await client.close()

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Session expiration

Sessions end when:
  • The connection is closed by the client (client.close())
  • The session is terminated in the Console
  • The API key used to create the session is revoked
  • Network connectivity is lost
When a session expires, all connected devices are disconnected and browsers are closed. Plan for graceful handling of session expiration in long-running automations.

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Multi-session patterns

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Load distribution

For high-volume automation, distribute load across multiple sessions: 
const sessions = await Promise.all([
  createAndConnectSession('session-1'),
  createAndConnectSession('session-2'),
  createAndConnectSession('session-3')
])

// Round-robin device allocation
const device = sessions[nextIndex++ % sessions.length]

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Next steps

Device management

Learn how to manage devices in sessions

Client API

Explore the Client API reference