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You can download data from the sandbox using the files.read() method. 
import fs from 'fs'
import { Sandbox } from '@e2b/code-interpreter'

const sandbox = await Sandbox.create()

// Read file from sandbox
const content = await sandbox.files.read('/path/in/sandbox')
// Write file to local filesystem
fs.writeFileSync('/local/path', content)

​
Download with pre-signed URL

Sometimes, you may want to let users from unauthorized environments, like a browser, download files from the sandbox. For this use case, you can use pre-signed URLs to let users download files securely. All you need to do is create a sandbox with the secure: true option. A download URL will then be generated with a signature that allows only authorized users to access files. You can optionally set an expiration time for the URL so that it will be valid only for a limited time. 
import fs from 'fs'
import { Sandbox } from '@e2b/code-interpreter'

// Start a secured sandbox (all operations must be authorized by default)
const sandbox = await Sandbox.create(template, { secure: true })

// Create a pre-signed URL for file download with a 10 second expiration
const publicUrl = await sandbox.downloadUrl(
  'demo.txt', {
    useSignatureExpiration: 10_000, // optional
  },
)

// Download a file with a pre-signed URL (this can be used in any environment, such as a browser)
const res = await fetch(publicUrl)
const content = await res.text()
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