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Streaming

Last Updated: 3/7/2026

Code Interpreting with Streaming

Execute code with real-time output streaming for interactive experiences.

Overview

Streaming allows you to receive output from code execution in real-time, rather than waiting for the entire execution to complete. This is essential for:

  • Long-running computations
  • Progress tracking
  • Interactive applications
  • Live feedback to users

Basic Streaming

import { Sandbox } from 'e2b'
 
const sandbox = await Sandbox.create()
 
// Execute with streaming
const execution = await sandbox.commands.run('python script.py', {
  onStdout: (output) => {
    console.log('Output:', output)
  },
  onStderr: (error) => {
    console.error('Error:', error)
  }
})
 
console.log('Final exit code:', execution.exitCode)
await sandbox.close()

Streaming Patterns

Progress Tracking

let currentProgress = 0
 
const code = `
import time
for i in range(100):
    print(f"PROGRESS:{i+1}")
    time.sleep(0.1)
`
 
await sandbox.files.write('/home/user/task.py', code)
 
await sandbox.commands.run('python /home/user/task.py', {
  onStdout: (line) => {
    const match = line.match(/PROGRESS:(\d+)/)
    if (match) {
      currentProgress = parseInt(match[1])
      console.log(`Progress: ${currentProgress}%`)
    }
  }
})
QuickstartOverview