Concept beginner · 3 min read

What is E2B

Quick answer
E2B is a secure code execution sandbox that allows running untrusted or AI-generated code safely in isolated environments. It provides APIs to execute, manage files, and install packages remotely, ensuring safe and controlled code execution.
E2B is a secure code execution sandbox that safely runs untrusted or AI-generated code in isolated environments to prevent security risks.

How it works

E2B operates as a sandboxed environment where code runs isolated from the host system, preventing harmful side effects or security breaches. It provides a controlled API to execute code snippets, manage files, and install dependencies dynamically. Think of it as a secure virtual machine dedicated to running AI-generated or third-party code safely, with strict resource and access controls.

Concrete example

Here is a Python example using the e2b_code_interpreter package to run Python code securely in the sandbox:

python
from e2b_code_interpreter import Sandbox
import os

sandbox = Sandbox(api_key=os.environ["E2B_API_KEY"])

# Run a simple Python print statement
execution = sandbox.run_code("print('Hello from sandbox')")
print(execution.text)

# Write a file and read it back
sandbox.files.write("data.txt", b"Sample data")
read_back = sandbox.files.read("data.txt")
print(read_back.decode())

# Install a package inside the sandbox
sandbox.run_code("import subprocess; subprocess.run(['pip','install','requests'])")

sandbox.close()
output 
Hello from sandbox
Sample data

When to use it

Use E2B when you need to safely execute untrusted, user-generated, or AI-generated code without risking your host environment. It is ideal for AI code interpreters, online coding platforms, and automated code evaluation systems. Avoid using it for high-performance or long-running processes where sandbox overhead may be a bottleneck.

Key terms

TermDefinition
SandboxAn isolated environment to run code securely without affecting the host system.
API KeyA secret token used to authenticate and authorize access to the E2B sandbox service.
File ManagementCapability to upload, read, and manage files inside the sandbox environment.
Package InstallationAbility to install Python packages dynamically within the sandbox for code execution.
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Key Takeaways

  • E2B provides a secure sandbox to run untrusted or AI-generated code safely.
  • Use the e2b_code_interpreter Python SDK to execute code, manage files, and install packages remotely.
  • Ideal for AI code execution, online interpreters, and automated code evaluation with strict security.
  • Sandbox isolation prevents code from affecting your host environment or leaking data.
  • Avoid E2B for performance-critical or long-running tasks due to sandbox overhead.
Verified 2026-04
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