# Node.js


This example shows how to migrate a Node.js application to Docker Hardened Images.

The following examples show Dockerfiles before and after migration to Docker
Hardened Images. Each example includes five variations:

- Before (Ubuntu): A sample Dockerfile using Ubuntu-based images, before migrating to DHI
- Before (Wolfi): A sample Dockerfile using Wolfi distribution images, before migrating to DHI
- Before (DOI): A sample Dockerfile using Docker Official Images, before migrating to DHI
- After (multi-stage): A sample Dockerfile after migrating to DHI with multi-stage builds (recommended for minimal, secure images)
- After (single-stage): A sample Dockerfile after migrating to DHI with single-stage builds (simpler but results in a larger image with a broader attack surface)

> [!NOTE]
>
> Multi-stage builds are recommended for most use cases. Single-stage builds are
> supported for simplicity, but come with tradeoffs in size and security.
>
> You must authenticate to `dhi.io` before you can pull Docker Hardened Images.
> Use your Docker ID credentials (the same username and password you use for
> Docker Hub). If you don't have a Docker account, [create
> one](/accounts/create-account/) for free.
>
> Run `docker login dhi.io` to authenticate.

**Before (Ubuntu)**



```dockerfile
#syntax=docker/dockerfile:1

FROM ubuntu/node:18-24.04_edge
WORKDIR /usr/src/app

COPY package*.json ./

RUN npm install

COPY . .

CMD ["node", "index.js"]
```

**Before (Wolfi)**



```dockerfile
#syntax=docker/dockerfile:1

FROM cgr.dev/chainguard/node:latest-dev
WORKDIR /usr/src/app

COPY package*.json ./

# Install any additional packages if needed using apk
# RUN apk add --no-cache python3 make g++

RUN npm install

COPY . .

CMD ["node", "index.js"]
```

**Before (DOI)**



```dockerfile
#syntax=docker/dockerfile:1

FROM node:latest
WORKDIR /usr/src/app

COPY package*.json ./

# Install any additional packages if needed using apt
# RUN apt-get update && apt-get install -y python3 make g++ && rm -rf /var/lib/apt/lists/*

RUN npm install

COPY . .

CMD ["node", "index.js"]
```

**After (multi-stage)**



```dockerfile
#syntax=docker/dockerfile:1

# === Build stage: Install dependencies and build application ===
FROM dhi.io/node:23-alpine3.21-dev AS builder
WORKDIR /usr/src/app

COPY package*.json ./

# Install any additional packages if needed using apk
# RUN apk add --no-cache python3 make g++

RUN npm install

COPY . .

# === Final stage: Create minimal runtime image ===
FROM dhi.io/node:23-alpine3.21
ENV PATH=/app/node_modules/.bin:$PATH

COPY --from=builder --chown=node:node /usr/src/app /app

WORKDIR /app

CMD ["index.js"]
```

**After (single-stage)**



```dockerfile
#syntax=docker/dockerfile:1

FROM dhi.io/node:23-alpine3.21-dev
WORKDIR /usr/src/app

COPY package*.json ./

# Install any additional packages if needed using apk
# RUN apk add --no-cache python3 make g++

RUN npm install

COPY . .

CMD ["node", "index.js"]
```