Setting environment variables

Global environment variables

You can set the sandbox's global environment variables when initializing a new sandbox.

import { Sandbox } from 'e2b'

const sandbox = await Sandbox.create({
  template: 'base',
  envVars: {FOO: 'Hello'}, 
})

await sandbox.close()

Environment variables per process

Alternatively, you can set environment variables when starting a new process. These environment variables are accessible only for this process.

Environment variables set when starting a new process have precedence over the environment variables set when initializing the sandbox.

import { Sandbox } from 'e2b'

const sandbox = await Sandbox.create({
  template: 'base',
  envVars: {FOO: 'Hello'},
})

const proc = await sandbox.process.start({
  cmd: 'echo $FOO $BAR!',
  envVars: {BAR: 'World'}, 
})
await proc.wait()
console.log(proc.output.stdout)
// output: Hello World!

await sandbox.close()