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Metadata is a way to attach arbitrary key-value pairs for a sandbox. This is useful in various scenarios, for example:
  • Associate a sandbox with a user session.
  • Store custom user data for a sandbox like API keys.
  • Associate a sandbox with a user ID and connect to it later.
You specify metadata when creating a sandbox and can access it later through listing running sandboxes with Sandbox.list() method. 
import { Sandbox } from 'e2b'

// Create sandbox with metadata.
const sandbox = await Sandbox.create({
  metadata: {
    userId: '123',
  },
})

// List running sandboxes and access metadata.
const paginator = await Sandbox.list()
const runningSandboxes = await paginator.nextItems()
// Will print:
// {
//   'userId': '123',
// }
console.log(runningSandboxes[0].metadata)

​
Filtering sandboxes by metadata

You can also filter sandboxes by metadata, you can find more about it here.