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The PTY (pseudo-terminal) module allows you to create interactive terminal sessions in the sandbox with real-time, bidirectional communication. Unlike commands.run() which executes a command and returns output after completion, PTY provides:
  • Real-time streaming - Output is streamed as it happens via callbacks
  • Bidirectional input - Send input while the terminal is running
  • Interactive shell - Full terminal support with ANSI colors and escape sequences
  • Session persistence - Disconnect and reconnect to running sessions

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Create a PTY session

Use sandbox.pty.create() to start an interactive bash shell. This example runs echo 'hello world', then exits and prints the terminal output. 
import { Sandbox } from 'e2b'

const sandbox = await Sandbox.create()

const terminal = await sandbox.pty.create({
  cols: 80,                    // Terminal size in characters
  rows: 24,
  envs: { MY_VAR: 'hello' },   // Optional environment variables
  cwd: '/home/user',           // Optional working directory
  user: 'root',                // Optional user to run as
  onData: (data) => {
    // Called whenever the terminal outputs data
    process.stdout.write(data)
  },
})

// terminal.pid contains the process ID
console.log('Terminal PID:', terminal.pid)

// Send input to the PTY. Data must be bytes (Uint8Array), and the trailing newline "presses Enter".
await sandbox.pty.sendInput(terminal.pid, new TextEncoder().encode("echo 'hello world'\n"))

// The PTY runs an interactive login shell that won't exit on its own, so tell it
// to exit — otherwise wait() below blocks forever.
await sandbox.pty.sendInput(terminal.pid, new TextEncoder().encode('exit\n'))

// Wait for the terminal to exit (output is streamed to onData above)
await terminal.wait()

from e2b import Sandbox, PtySize

sandbox = Sandbox.create()

terminal = sandbox.pty.create(
    size=PtySize(rows=24, cols=80),  # Terminal size in characters
    envs={'MY_VAR': 'hello'},        # Optional environment variables
    cwd='/home/user',                # Optional working directory
    user='root',                     # Optional user to run as
)

# terminal.pid contains the process ID
print('Terminal PID:', terminal.pid)

# Send input to the PTY via the pty module. Data must be bytes, and the trailing newline "presses Enter".
sandbox.pty.send_stdin(terminal.pid, b"echo 'hello world'\n")

# The PTY runs an interactive login shell that won't exit on its own, so tell it
# to exit — otherwise wait() below blocks forever.
sandbox.pty.send_stdin(terminal.pid, b"exit\n")

# Stream output by passing on_pty to wait()
# end='' prevents print from adding an extra newline
terminal.wait(on_pty=lambda data: print(data.decode(), end=''))
The PTY runs an interactive bash shell with TERM=xterm-256color, which supports ANSI colors and escape sequences.

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Timeout

PTY sessions have a configurable timeout that controls the session duration. The default is 60 seconds. For interactive or long-running sessions, set timeoutMs: 0 (JavaScript) or timeout=0 (Python) to keep the session open indefinitely. 
import { Sandbox } from 'e2b'

const sandbox = await Sandbox.create()

const terminal = await sandbox.pty.create({
  cols: 80,
  rows: 24,
  onData: (data) => process.stdout.write(data),
  timeoutMs: 0,  // Keep the session open indefinitely
})

from e2b import Sandbox, PtySize

sandbox = Sandbox.create()

terminal = sandbox.pty.create(
    PtySize(rows=24, cols=80),
    timeout=0,  # Keep the session open indefinitely
)

# end='' prevents print() from adding an extra newline
# (PTY output already contains newlines)
terminal.wait(on_pty=lambda data: print(data.decode(), end=''))

​
Send input to PTY

Use sendInput() in JavaScript or send_stdin() in Python to send data to the terminal. These methods return a Promise (JavaScript) or complete synchronously (Python) - the actual output is delivered to your onData callback (JavaScript) or to the on_pty callback you pass to wait() (Python). 
import { Sandbox } from 'e2b'

const sandbox = await Sandbox.create()

const terminal = await sandbox.pty.create({
  cols: 80,
  rows: 24,
  onData: (data) => process.stdout.write(data),
})

// Send a command (don't forget the newline!)
await sandbox.pty.sendInput(
  terminal.pid,
  new TextEncoder().encode('echo "Hello from PTY"\n')
)

from e2b import Sandbox, PtySize

sandbox = Sandbox.create()

terminal = sandbox.pty.create(PtySize(rows=24, cols=80))

# Send a command as bytes (b'...' is Python's byte string syntax)
# Don't forget the newline!
sandbox.pty.send_stdin(terminal.pid, b'echo "Hello from PTY"\n')

# Receive output by passing on_pty to wait()
# end='' prevents print from adding an extra newline
terminal.wait(on_pty=lambda data: print(data.decode(), end=''))

​
Resize the terminal

When the user’s terminal window changes size, notify the PTY with resize(). The cols and rows parameters are measured in characters, not pixels. 
import { Sandbox } from 'e2b'

const sandbox = await Sandbox.create()

const terminal = await sandbox.pty.create({
  cols: 80,
  rows: 24,
  onData: (data) => process.stdout.write(data),
})

// Resize to new dimensions (in characters)
await sandbox.pty.resize(terminal.pid, {
  cols: 120,
  rows: 40,
})

from e2b import Sandbox, PtySize

sandbox = Sandbox.create()

terminal = sandbox.pty.create(PtySize(rows=24, cols=80))

# Resize to new dimensions (in characters)
sandbox.pty.resize(terminal.pid, PtySize(rows=40, cols=120))

​
Disconnect and reconnect

You can disconnect from a PTY session while keeping it running, then reconnect later with a new data handler. This is useful for:
  • Resuming terminal sessions after network interruptions
  • Sharing terminal access between multiple clients
  • Implementing terminal session persistence
import { Sandbox } from 'e2b'

const sandbox = await Sandbox.create()

// Create a PTY session
const terminal = await sandbox.pty.create({
  cols: 80,
  rows: 24,
  onData: (data) => console.log('Handler 1:', new TextDecoder().decode(data)),
})

const pid = terminal.pid

// Send a command
await sandbox.pty.sendInput(pid, new TextEncoder().encode('echo hello\n'))

// Disconnect - PTY keeps running in the background
await terminal.disconnect()

// Later: reconnect with a new data handler
const reconnected = await sandbox.pty.connect(pid, {
  onData: (data) => console.log('Handler 2:', new TextDecoder().decode(data)),
})

// Continue using the session
await sandbox.pty.sendInput(pid, new TextEncoder().encode('echo world\n'))

// Wait for the terminal to exit
await reconnected.wait()

from e2b import Sandbox, PtySize

sandbox = Sandbox.create()

# Create a PTY session
terminal = sandbox.pty.create(PtySize(rows=24, cols=80))

pid = terminal.pid

# Send a command
sandbox.pty.send_stdin(pid, b'echo hello\n')

# Disconnect - PTY keeps running in the background
terminal.disconnect()

# Later: reconnect to the same session
reconnected = sandbox.pty.connect(pid)

# Continue using the session, then exit
sandbox.pty.send_stdin(pid, b'echo world\nexit\n')

# Wait for the terminal to exit, streaming output via on_pty
reconnected.wait(on_pty=lambda data: print('Handler:', data.decode()))

​
Kill the PTY

Terminate the PTY session with kill(). 
import { Sandbox } from 'e2b'

const sandbox = await Sandbox.create()

const terminal = await sandbox.pty.create({
  cols: 80,
  rows: 24,
  onData: (data) => process.stdout.write(data),
})

// Kill the PTY
const killed = await sandbox.pty.kill(terminal.pid)
console.log('Killed:', killed)  // true if successful

// Or use the handle method
// await terminal.kill()

from e2b import Sandbox, PtySize

sandbox = Sandbox.create()

terminal = sandbox.pty.create(PtySize(rows=24, cols=80))

# Kill the PTY
killed = sandbox.pty.kill(terminal.pid)
print('Killed:', killed)  # True if successful

# Or use the handle method
# terminal.kill()

​
Wait for PTY to exit

Use wait() to wait for the terminal session to end (e.g., when the user types exit). 
import { Sandbox } from 'e2b'

const sandbox = await Sandbox.create()

const terminal = await sandbox.pty.create({
  cols: 80,
  rows: 24,
  onData: (data) => process.stdout.write(data),
})

// Send exit command
await sandbox.pty.sendInput(terminal.pid, new TextEncoder().encode('exit\n'))

// Wait for the terminal to exit
const result = await terminal.wait()
console.log('Exit code:', result.exitCode)

from e2b import Sandbox, PtySize

sandbox = Sandbox.create()

terminal = sandbox.pty.create(PtySize(rows=24, cols=80))

# Send exit command
sandbox.pty.send_stdin(terminal.pid, b'exit\n')

# Wait for the terminal to exit, streaming output via on_pty
result = terminal.wait(on_pty=lambda data: print(data.decode(), end=''))
print('Exit code:', result.exit_code)

​
Interactive terminal (SSH-like)

Building a fully interactive terminal (like SSH) requires handling raw mode, stdin forwarding, and terminal resize events. For a production implementation, see the E2B CLI source code which uses the same sandbox.pty API documented above.