Accessing Localhost service from a Docker Container

Kristiyan Velkov

2 min read

·

Feb 21, 2025

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If you’ve ever run into issues accessing your local development server from inside a Docker container, you’re not alone.

Many developers face challenges when their application running in a container needs to interact with services running on their host machine.

Luckily, Docker provides a simple way to do this: host.docker.internal

What is host.docker.internal?

host.docker.internal is a Docker Desktop feature.

It is a special hostname that allows a Docker container to reach the host machine’s network.

This is useful when:

• A backend service running locally needs to be accessed from a containerized front-end application.
• A microservices architecture requires services to communicate between local and containerized environments.
• You’re testing APIs or running a development database outside the container.

Using host.docker.internal

Accessing Localhost from a Docker Container

If your local service runs on port 3000, you can use this inside your container: