Migrate From E2b

Migrate from E2B to Blaxel

This guide covers migrating cloud sandbox code from E2B (@e2b/code-interpreter / e2b) to Blaxel (@blaxel/core / blaxel).

Package replacement

# TypeScript
npm uninstall @e2b/code-interpreter e2b
npm install @blaxel/core

# Python
pip uninstall e2b-code-interpreter e2b
pip install blaxel

Authentication

Blaxel authenticates automatically when logged in via CLI (bl login YOUR-WORKSPACE). No need to set API keys in code.

API mapping

Imports

TypeScript:

// BEFORE (E2B)
import { Sandbox } from '@e2b/code-interpreter'

// AFTER (Blaxel)
import { SandboxInstance } from '@blaxel/core'

Python:

# BEFORE (E2B)
from e2b_code_interpreter import Sandbox

# AFTER (Blaxel)
from blaxel.core import SandboxInstance

Sandbox creation

TypeScript:

// BEFORE (E2B)
const sandbox = await Sandbox.create()
// With options:
const sandbox = await Sandbox.create({
  timeoutMs: 300_000,  // 5 min default, max 24h (Pro) / 1h (Hobby)
  envs: { NODE_ENV: 'production' },
  metadata: { project: 'my-app' },
})
// With template:
const sandbox = await Sandbox.create('my-template-id', {
  timeoutMs: 600_000,
})

// AFTER (Blaxel)
const sandbox = await SandboxInstance.createIfNotExists({
  name: 'my-sandbox',
  image: 'blaxel/base-image:latest',
  region: 'us-pdx-1',
  memory: 2048,
  ports: [{ target: 3000, protocol: 'HTTP' }],
  envs: [
    { name: 'NODE_ENV', value: 'production' },
  ],
  labels: { project: 'my-app' },
  ttl: '24h',
})

Python:

# BEFORE (E2B)
sandbox = Sandbox()
# With options:
sandbox = Sandbox(timeout=300, envs={"NODE_ENV": "production"}, metadata={"project": "my-app"})
# With template:
sandbox = Sandbox("my-template-id", timeout=600)

# AFTER (Blaxel)
sandbox = await SandboxInstance.create_if_not_exists({
    "name": "my-sandbox",
    "image": "blaxel/base-image:latest",
    "region": "us-pdx-1",
    "memory": 2048,
    "ports": [{"target": 3000, "protocol": "HTTP"}],
    "envs": [
        {"name": "NODE_ENV", "value": "production"},
    ],
    "labels": {"project": "my-app"},
    "ttl": "24h",
})

Parameter mapping

Custom sandbox / templates

TypeScript:

// BEFORE (E2B) - uses template IDs from E2B dashboard
// Templates are built via e2b CLI: e2b template build
const sandbox = await Sandbox.create('my-template-id')

// AFTER (Blaxel) - uses custom images deployed via `bl deploy`
// 1. Create template: bl new sandbox my-template
// 2. Edit the Dockerfile
// 3. Deploy: bl deploy
// 4. Use the deployed image:
const sandbox = await SandboxInstance.createIfNotExists({
  name: 'my-sandbox',
  image: 'my-custom-template-image',
  region: 'us-pdx-1',
  memory: 2048,
})

Python:

# BEFORE (E2B) - uses template IDs from E2B dashboard
sandbox = Sandbox("my-template-id")

# AFTER (Blaxel) - uses custom images deployed via `bl deploy`
sandbox = await SandboxInstance.create_if_not_exists({
    "name": "my-sandbox",
    "image": "my-custom-template-image",
    "region": "us-pdx-1",
    "memory": 2048,
})

Template building methods mapping

E2B has programmatic template building via Template.build() with chainable methods. Blaxel uses standard Dockerfiles deployed with bl deploy. All E2B template methods map to Dockerfile instructions:

Template versioning: E2B supports Template.assignTags() and creation with Sandbox.create('template:v1.0.0'). Blaxel templates are deployed via bl deploy without version tagging.

Template pre-building: E2B's Template.build() and Template.buildInBackground() with Template.getBuildStatus(). Blaxel equivalent is bl deploy which builds and caches the image in Blaxel's private registry.

Command execution

TypeScript:

// BEFORE (E2B)
const result = await sandbox.commands.run('echo hello')
// result.stdout, result.stderr, result.exitCode

const result = await sandbox.commands.run('npm install', {
  envs: { NODE_ENV: 'production' },
  cwd: '/app',
})

// AFTER (Blaxel)
const result = await sandbox.process.exec({
  command: 'echo hello',
  waitForCompletion: true,
})
const result = await sandbox.process.exec({
  command: 'npm install',
  workingDir: '/app',
  env: { NODE_ENV: 'production' },
  waitForCompletion: true,
})

Python:

# BEFORE (E2B)
result = sandbox.commands.run("echo hello")
# result.stdout, result.stderr, result.exit_code

result = sandbox.commands.run("npm install", envs={"NODE_ENV": "production"}, cwd="/app")

# AFTER (Blaxel)
result = await sandbox.process.exec({
    "command": "echo hello",
    "wait_for_completion": True,
})
result = await sandbox.process.exec({
    "command": "npm install",
    "working_dir": "/app",
    "env": {"NODE_ENV": "production"},
    "wait_for_completion": True,
})

Background / streaming commands

TypeScript:

// BEFORE (E2B) - background mode with callbacks
const command = await sandbox.commands.run('npm run dev', {
  background: true,
  cwd: '/app',
  envs: { NODE_ENV: 'development' },
  onStdout: (data) => console.log(data),
  onStderr: (data) => console.error(data),
})
// Later:
await sandbox.commands.kill(command.pid)

// AFTER (Blaxel) - native background mode with port waiting
const devServer = await sandbox.process.exec({
  name: 'dev-server',
  command: 'npm run dev -- --host 0.0.0.0',
  workingDir: '/app',
  waitForPorts: [3000],  // returns once port 3000 is open
})
// Or with log callbacks:
const proc = await sandbox.process.exec({
  name: 'dev-server',
  command: 'npm run dev -- --host 0.0.0.0',
  workingDir: '/app',
  waitForCompletion: false,
  onLog: (log) => console.log(log),
})
// Later:
await sandbox.process.kill('dev-server')

Python:

# BEFORE (E2B) - background mode
command = sandbox.commands.run("npm run dev", background=True, cwd="/app",
    envs={"NODE_ENV": "development"},
    data: print(data),
    data: print(data),
)
# Later:
sandbox.commands.kill(command.pid)

# AFTER (Blaxel) - native background mode with port waiting
dev_server = await sandbox.process.exec({
    "name": "dev-server",
    "command": "npm run dev -- --host 0.0.0.0",
    "working_dir": "/app",
    "wait_for_ports": [3000],
})
# Later:
await sandbox.process.kill("dev-server")

Log streaming / Process output

E2B streams output via onStdout/onStderr callbacks and returns results with stdout, stderr, exitCode. Blaxel offers similar callbacks plus additional methods for log retrieval and streaming.

TypeScript:

// BEFORE (E2B) - callbacks + result properties
const result = await sandbox.commands.run('npm run build', {
  cwd: '/app',
  onStdout: (data) => console.log(data),
  onStderr: (data) => console.error(data),
})
console.log(result.stdout, result.stderr, result.exitCode)

// AFTER (Blaxel) - callbacks on exec
const result = await sandbox.process.exec({
  command: 'npm run build',
  workingDir: '/app',
  onLog: (log) => console.log(log),
  onStdout: (out) => process.stdout.write(out),
  onStderr: (err) => process.stderr.write(err),
  waitForCompletion: true,
})
// result.stdout, result.stderr, result.exitCode available after completion

// Stream logs from a running process:
const handle = sandbox.process.streamLogs('dev-server', {
  onLog: (log) => console.log(log),
  onStdout: (out) => process.stdout.write(out),
  onStderr: (err) => process.stderr.write(err),
  onError: (err) => console.error(err),
})
// Wait for the process to finish before closing the stream:
await handle.wait()

// Retrieve logs after the fact:
const logs = await sandbox.process.logs('dev-server')             // all
const stdout = await sandbox.process.logs('dev-server', 'stdout')
const stderr = await sandbox.process.logs('dev-server', 'stderr')

Python:

# BEFORE (E2B)
result = sandbox.commands.run("npm run build", cwd="/app",
    data: print(data),
    data: print(data, file=sys.stderr),
)
print(result.stdout, result.stderr, result.exit_code)

# Background command wait (Python):
cmd = sandbox.commands.run("long-task", background=True)
cmd.wait()  # blocks until complete

# AFTER (Blaxel)
result = await sandbox.process.exec({
    "command": "npm run build",
    "working_dir": "/app",
    "on_log": lambda log: print(log),
    "wait_for_completion": True,
})

# Wait for a running process:
result = await sandbox.process.wait("dev-server", {
    "max_wait": 300000,  # 5 minutes in ms
    "interval": 2000,
})

Sandbox lifecycle management

Filesystem operations

TypeScript:

// BEFORE (E2B)
await sandbox.files.write('/app/file.txt', 'hello')
const content = await sandbox.files.read('/app/file.txt')
const files = await sandbox.files.list('/app')

// AFTER (Blaxel)
await sandbox.fs.write('/app/file.txt', 'hello')
const content = await sandbox.fs.read('/app/file.txt')
const { subdirectories, files } = await sandbox.fs.ls('/app')

// Write multiple files at once:
await sandbox.fs.writeTree([
  { path: 'src/index.ts', content: 'console.log("hello")' },
  { path: 'package.json', content: '{"name":"app"}' },
], '/app')

// Delete files:
await sandbox.fs.rm('/app/temp.txt')
await sandbox.fs.rm('/app/old-dir', { recursive: true })

// Copy files:
await sandbox.fs.cp('/app/file.txt', '/backup/file.txt')

// Watch for file changes:
const handle = sandbox.fs.watch('/app/src', (event) => {
  console.log(event.op, event.path)
}, { withContent: true, ignore: ['node_modules', '.git'] })
// Later: handle.close()

Python:

# BEFORE (E2B)
sandbox.files.write("/app/file.txt", "hello")
content = sandbox.files.read("/app/file.txt")
files = sandbox.files.list("/app")

# AFTER (Blaxel)
await sandbox.fs.write("/app/file.txt", "hello")
content = await sandbox.fs.read("/app/file.txt")
listing = await sandbox.fs.ls("/app")

# Write multiple files at once:
await sandbox.fs.write_tree([
    {"path": "src/index.ts", "content": 'console.log("hello")'},
    {"path": "package.json", "content": '{"name":"app"}'},
], "/app")

# Delete files:
await sandbox.fs.rm("/app/temp.txt")
await sandbox.fs.rm("/app/old-dir", recursive=True)

# Copy files:
await sandbox.fs.cp("/app/file.txt", "/backup/file.txt")

# Watch for file changes:
def on_change(event):
    print(event.op, event.path)

handle = sandbox.fs.watch("/app/src", on_change, {
    "with_content": True,
    "ignore": ["node_modules", ".git"]
})
# Later: handle["close"]()

Preview URLs

E2B provides getHost() / get_host() for accessing sandbox ports. Blaxel has dedicated preview URL management with access control.

TypeScript:

// BEFORE (E2B) - all ports accessible via getHost
const host = sandbox.getHost(3000)
// Returns: xxxx-3000.e2b.dev (always public, no access control)

// AFTER (Blaxel) - dedicated preview URL with public/private access control
const preview = await sandbox.previews.createIfNotExists({
  metadata: { name: 'app-preview' },
  spec: { port: 3000, public: true },
})
const url = preview.spec?.url  // https://xxxx.preview.bl.run

Python:

# BEFORE (E2B)
host = sandbox.get_host(3000)
# Returns: xxxx-3000.e2b.dev

# AFTER (Blaxel)
preview = await sandbox.previews.create_if_not_exists({
    "metadata": {"name": "app-preview"},
    "spec": {"port": 3000, "public": True},
})
url = preview.spec.url  # https://xxxx.preview.bl.run

Secured / Private access

E2B uses secure: true with sandbox.trafficAccessToken for restricted access. Blaxel uses private preview URLs with token-based authentication.

TypeScript:

// BEFORE (E2B) - secured sandbox
const sandbox = await Sandbox.create({ secure: true })
const host = sandbox.getHost(3000)
// Access requires X-Access-Token header: sandbox.trafficAccessToken

// AFTER (Blaxel) - private preview with token
const preview = await sandbox.previews.createIfNotExists({
  metadata: { name: 'app-preview' },
  spec: { port: 3000, public: false },
})
const token = await preview.tokens.create(new Date(Date.now() + 3600000))
// Access: preview.spec?.url + "?bl_preview_token=" + token.value

// Or use sessions for SDK-based frontend access:
const session = await sandbox.sessions.create({
  expiresAt: new Date(Date.now() + 3600000),
})
// Pass session token to frontend

Pause / Resume

E2B has explicit pause() / resume() methods (beta). Blaxel auto-scales to zero and resumes transparently.

TypeScript:

// BEFORE (E2B) - explicit pause/resume (beta)
const sandboxId = sandbox.sandboxId
await sandbox.pause()
// ... later ...
const sandbox = await Sandbox.connect(sandboxId)  // auto-resumes if paused

// AFTER (Blaxel) - automatic: sandboxes auto-pause after ~5s inactivity
// and resume in <25ms on the next API call. No explicit pause/resume needed.
// Just reconnect by name:
const sandbox = await SandboxInstance.get('my-sandbox')

Python:

# BEFORE (E2B) - explicit pause/resume (beta)
sandbox_id = sandbox.sandbox_id
sandbox.pause()
# ... later ...
sandbox = Sandbox.connect(sandbox_id)  # auto-resumes if paused

# AFTER (Blaxel) - automatic, just reconnect by name
sandbox = await SandboxInstance.get("my-sandbox")

Snapshots

E2B supports explicit snapshots for saving and restoring sandbox state. Blaxel auto-preserves state through scale-to-zero.

TypeScript:

// BEFORE (E2B) - explicit snapshots
const snapshot = await sandbox.createSnapshot()
const snapshotId = snapshot.snapshotId
await sandbox.kill()
// ... later - restore from snapshot:
const restored = await Sandbox.create(snapshotId)

// List and manage snapshots:
const snapshots = await Sandbox.listSnapshots()
await Sandbox.deleteSnapshot(snapshotId)

// AFTER (Blaxel) - automatic state preservation
// State (memory + filesystem) persists through auto scale-to-zero.
// No explicit snapshots needed — just reconnect:
const sandbox = await SandboxInstance.get('my-sandbox')

// To share pre-built state across multiple sandboxes,
// use volume templates: bl new volume-template

Sandbox info & cleanup

TypeScript:

// BEFORE (E2B)
const info = await sandbox.getInfo()  // sandboxId, templateId, metadata, etc.
await sandbox.kill()

// AFTER (Blaxel)
const sandbox = await SandboxInstance.get('my-sandbox')  // full sandbox details
await sandbox.delete()

Python:

# BEFORE (E2B)
info = sandbox.get_info()
sandbox.kill()

# AFTER (Blaxel)
sandbox = await SandboxInstance.get("my-sandbox")
await sandbox.delete()

Reconnect to existing sandbox

TypeScript:

// BEFORE (E2B) - connect by opaque ID
const sandbox = await Sandbox.connect(sandboxId)

// AFTER (Blaxel) - connect by human-readable name
const sandbox = await SandboxInstance.get('my-sandbox')

Python:

# BEFORE (E2B) - connect by opaque ID
sandbox = Sandbox.connect(sandbox_id)

# AFTER (Blaxel) - connect by human-readable name
sandbox = await SandboxInstance.get("my-sandbox")

Code Interpreter

E2B's @e2b/code-interpreter package provides runCode() for executing code in isolated interpreters with result/chart detection. Blaxel has a CodeInterpreter class with similar capabilities.

TypeScript:

// BEFORE (E2B) - code interpreter
import { Sandbox } from '@e2b/code-interpreter'

const sandbox = await Sandbox.create()
const execution = await sandbox.runCode('print("hello")', {
  language: 'python',
  onStdout: (data) => console.log(data),
  onStderr: (data) => console.error(data),
})
console.log(execution.results, execution.logs, execution.error)

// Code contexts for stateful execution:
const context = await sandbox.createCodeContext({ language: 'python', cwd: '/app' })
await sandbox.runCode('x = 42', { context })
await sandbox.runCode('print(x)', { context })  // prints 42

// AFTER (Blaxel) - CodeInterpreter class
import { CodeInterpreter } from '@blaxel/core'

const interpreter = await CodeInterpreter.createIfNotExists({
  name: 'my-interpreter',
  // Automatically uses "blaxel/jupyter-server" image
  // Default lifecycle: ttl-idle: 30m
})
const result = await interpreter.runCode({
  code: 'print("hello")',
  language: 'python',
  onStdout: (out) => console.log(out),
  onStderr: (err) => console.error(err),
})

// Stateful code contexts:
const context = await interpreter.createCodeContext({ language: 'python', name: 'my-ctx' })
await interpreter.runCode({ code: 'x = 42', context: 'my-ctx' })
await interpreter.runCode({ code: 'print(x)', context: 'my-ctx' })  // prints 42

Python:

# BEFORE (E2B)
from e2b_code_interpreter import Sandbox

sandbox = Sandbox()
execution = sandbox.run_code("print('hello')", language="python")
print(execution.results, execution.logs, execution.error)

# AFTER (Blaxel)
from blaxel.core import CodeInterpreter

interpreter = await CodeInterpreter.create_if_not_exists({
    "name": "my-interpreter",
})
result = await interpreter.run_code({
    "code": "print('hello')",
    "language": "python",
})

Note: E2B automatically detects Matplotlib charts and returns them as base64 PNG or structured chart objects. Blaxel's CodeInterpreter does not have automatic chart detection — chart output is captured as standard output from the Jupyter kernel.

Git integration

E2B provides a full sandbox.git.* API for git operations. Blaxel has no dedicated git API — use process.exec() with git commands instead.

TypeScript:

// BEFORE (E2B) - dedicated git API
await sandbox.git.clone('https://github.com/user/repo.git', { path: '/app', depth: 1 })
await sandbox.git.configureUser('name', 'email@example.com')
const status = await sandbox.git.status('/app')
await sandbox.git.add('/app')
await sandbox.git.commit('/app', 'my commit')
await sandbox.git.push('/app', { remote: 'origin', branch: 'main' })

// AFTER (Blaxel) - git via process.exec
await sandbox.process.exec({
  command: 'git clone --depth 1 https://github.com/user/repo.git /app',
  waitForCompletion: true,
})
await sandbox.process.exec({
  command: 'git config user.name "name" && git config user.email "email@example.com"',
  workingDir: '/app',
  waitForCompletion: true,
})
await sandbox.process.exec({
  command: 'git add . && git commit -m "my commit" && git push origin main',
  workingDir: '/app',
  env: { GIT_TOKEN: 'your-token' },
  waitForCompletion: true,
})

Note: Git must be installed in the sandbox image. Most Blaxel base images include git. For private repos, pass credentials via env parameter or configure git credential storage.

MCP integration

E2B provides MCP gateway access via getMcpUrl() / getMcpToken(). Blaxel sandboxes have a built-in MCP server.

TypeScript:

// BEFORE (E2B) - MCP gateway
const mcpUrl = sandbox.getMcpUrl()
const mcpToken = sandbox.getMcpToken()
// Connect via HTTP transport with Bearer token

// AFTER (Blaxel) - built-in MCP server per sandbox
// Every sandbox exposes MCP at https://<SANDBOX_URL>/mcp
// Use SDK helpers for framework-specific tool definitions:
import { blTools } from '@blaxel/vercel'  // or @blaxel/langgraph, @blaxel/mastra, etc.
const tools = await blTools(['sandbox/my-sandbox'])

Python:

# BEFORE (E2B)
mcp_url = sandbox.get_mcp_url()
mcp_token = sandbox.get_mcp_token()

# AFTER (Blaxel)
from blaxel.openai import bl_tools  # or blaxel.langgraph, blaxel.pydantic, etc.
tools = await bl_tools(["sandbox/my-sandbox"])

Key differences

• No API key in code: Blaxel SDK auto-detects credentials from CLI login, .env, env vars, or config file
• Named sandboxes: Blaxel supports createIfNotExists / create_if_not_exists with a name for idempotent creation; E2B uses opaque auto-generated IDs. Blaxel uses human-readable names, not opaque IDs
• Ports declared at creation: Blaxel requires ports at sandbox creation time; they cannot be added later. Ports 80, 443, 8080 are reserved. E2B exposes all ports implicitly
• Region selection: Blaxel lets you choose a region (us-pdx-1); E2B does not expose region selection
• Auto scale-to-zero: Blaxel sandboxes auto-pause after ~5s of inactivity and resume in <25ms. No explicit pause/resume needed. E2B requires explicit pause()/resume() (beta) or createSnapshot()
• Preview URLs vs getHost: Blaxel has a dedicated preview URL system with public/private access control and token-based auth; E2B uses getHost(port) / get_host(port) which provides public access only (unless secure: true)
• Async by default: Blaxel Python SDK is async-first (all calls use await); E2B Python SDK is sync by default
• Environment variables: E2B uses a flat object at creation (envs: { KEY: 'val' }), inherited by all commands. Blaxel uses an array at creation (envs: [{ name: 'KEY', value: 'val' }]) and a flat object per-command (env: { KEY: 'val' }). Blaxel supports secret: true for sensitive values
• Process naming and management: Blaxel processes can be named for later reference (get, stop, kill, list, wait, logs by name); E2B returns command objects with PIDs
• Log streaming: E2B has onStdout/onStderr callbacks. Blaxel additionally offers onLog callback, process.streamLogs() with handle (close/wait), and process.logs() with type filtering (stdout/stderr/all)
• waitForPorts / wait_for_ports: Blaxel can wait for a port to be open before returning; E2B requires manual polling
• Dev server binding: Dev servers must bind to 0.0.0.0 (not localhost) for preview URLs to work in Blaxel
• ~50% memory reserved for tmpfs: Blaxel uses half of sandbox memory for the in-memory filesystem. Use volumes for extra storage
• No PTY / interactive terminal: E2B has full sandbox.pty.* API. Blaxel has no interactive terminal support
• No dedicated git API: E2B has sandbox.git.* for git operations. Blaxel uses process.exec() with git commands
• No sandbox metrics: E2B provides getMetrics() for CPU/memory/disk usage. Blaxel has no metrics API
• No webhooks/events: E2B has lifecycle events API and webhook registration. Blaxel has no equivalent
• No pre-signed URLs: E2B has uploadUrl()/downloadUrl() for direct browser-to-sandbox file transfer. Blaxel uses SDK methods (fs.write/fs.read) instead
• Template building: E2B has programmatic Template.build() with chainable methods. Blaxel uses standard Dockerfiles + bl deploy
• MCP integration: E2B uses getMcpUrl()/getMcpToken(). Blaxel has a built-in MCP server per sandbox + framework-specific blTools() helpers
• Volumes: Blaxel supports persistent volumes (VolumeInstance) attached at sandbox creation. E2B does not have a volumes concept
• Code Interpreter: E2B has runCode() with chart detection. Blaxel has CodeInterpreter class with runCode() and code contexts (no chart detection)

Complete migration example

TypeScript

BEFORE (E2B):

import { Sandbox } from '@e2b/code-interpreter'

const sandbox = await Sandbox.create({
  timeoutMs: 600_000,
  envs: { NODE_ENV: 'production' },
  metadata: { project: 'demo' },
})

await sandbox.files.write('/app/index.js', 'console.log("hello")')
const result = await sandbox.commands.run('node /app/index.js')
console.log(result.stdout)

// Start dev server in background
const cmd = await sandbox.commands.run('cd /app && npm run dev', {
  background: true,
  onStdout: (data) => console.log(data),
})

const host = sandbox.getHost(3000)
console.log(`Preview: https://${host}`)

await sandbox.commands.kill(cmd.pid)
await sandbox.kill()

AFTER (Blaxel):

import { SandboxInstance } from '@blaxel/core'

const sandbox = await SandboxInstance.createIfNotExists({
  name: 'my-sandbox',
  image: 'blaxel/node:latest',
  region: 'us-pdx-1',
  memory: 2048,
  ports: [{ target: 3000, protocol: 'HTTP' }],
  envs: [{ name: 'NODE_ENV', value: 'production' }],
  labels: { project: 'demo' },
  ttl: '24h',
})

await sandbox.fs.write('/app/index.js', 'console.log("hello")')
const result = await sandbox.process.exec({
  command: 'node /app/index.js',
  workingDir: '/app',
  waitForCompletion: true,
})

// Start dev server, wait for port
await sandbox.process.exec({
  name: 'dev-server',
  command: 'npm run dev -- --host 0.0.0.0',
  workingDir: '/app',
  waitForPorts: [3000],
})

// Get a shareable preview URL
const preview = await sandbox.previews.createIfNotExists({
  metadata: { name: 'app-preview' },
  spec: { port: 3000, public: true },
})
console.log(`Preview: ${preview.spec?.url}`)

await sandbox.process.kill('dev-server')
await sandbox.delete()

Python

BEFORE (E2B):

from e2b_code_interpreter import Sandbox

sandbox = Sandbox(timeout=600, envs={"NODE_ENV": "production"}, metadata={"project": "demo"})

sandbox.files.write("/app/index.js", 'console.log("hello")')
result = sandbox.commands.run("node /app/index.js")
print(result.stdout)

# Start dev server in background
cmd = sandbox.commands.run("cd /app && npm run dev", background=True,
    data: print(data),
)

host = sandbox.get_host(3000)
print(f"Preview: https://{host}")

sandbox.commands.kill(cmd.pid)
sandbox.kill()

AFTER (Blaxel):

import asyncio
from blaxel.core import SandboxInstance

async def main():
    sandbox = await SandboxInstance.create_if_not_exists({
        "name": "my-sandbox",
        "image": "blaxel/node:latest",
        "region": "us-pdx-1",
        "memory": 2048,
        "ports": [{"target": 3000, "protocol": "HTTP"}],
        "envs": [{"name": "NODE_ENV", "value": "production"}],
        "labels": {"project": "demo"},
        "ttl": "24h",
    })

    await sandbox.fs.write("/app/index.js", 'console.log("hello")')
    result = await sandbox.process.exec({
        "command": "node /app/index.js",
        "working_dir": "/app",
        "wait_for_completion": True,
    })

    # Start dev server, wait for port
    await sandbox.process.exec({
        "name": "dev-server",
        "command": "npm run dev -- --host 0.0.0.0",
        "working_dir": "/app",
        "wait_for_ports": [3000],
    })

    # Get a shareable preview URL
    preview = await sandbox.previews.create_if_not_exists({
        "metadata": {"name": "app-preview"},
        "spec": {"port": 3000, "public": True},
    })
    print(f"Preview: {preview.spec.url}")

    await sandbox.process.kill("dev-server")
    await sandbox.delete()

asyncio.run(main())

Resources

• Blaxel docs: https://docs.blaxel.ai
• Blaxel sandbox images: https://github.com/blaxel-ai/sandbox/tree/main/hub
• E2B docs: https://e2b.dev/docs
• SDK reference (TypeScript): @blaxel/core — see ./references/sdk-typescript.md
• SDK reference (Python): blaxel — see ./references/sdk-python.md