Developer

Dockerfile Generator

Generate production-ready Dockerfiles with multi-stage builds, security best practices, and .dockerignore files

Choose a Stack

Configure: Node.js

Node.js Version

Package Manager

Port

Use Alpine variant

Multi-stage build

Maintainer

Include curl (for health checks)

Add explanatory comments

Best Practices: Node.js

Copy package.json and lockfile before source code so the dependency layer is cached separately
Use --frozen-lockfile / npm ci to ensure reproducible builds
Multi-stage builds keep the final image small by discarding build-time dependencies
Always run as a non-root user in production containers
Pin your Node.js major version (e.g. node:22-alpine) for stability

# Pin to specific version in production, e.g., node:22.11-alpine
# Stage 1: Install dependencies
FROM node:22-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci
 
# Stage 2: Build (if applicable)
FROM node:22-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build
 
# Stage 3: Production image
FROM node:22-alpine AS runner
 
LABEL org.opencontainers.image.authors="team@example.com" \
      org.opencontainers.image.version="1.0.0" \
      org.opencontainers.image.description="Production image"
 
WORKDIR /app
ENV NODE_ENV=production
 
# Copy only production dependencies and built output
COPY package.json package-lock.json ./
RUN npm ci --omit=dev
COPY --from=builder /app/dist ./dist
 
RUN apk add --no-cache curl
 
# Create non-root user for security
RUN addgroup -S appusergroup && adduser -S appuser -G appusergroup
USER appuser
 
EXPOSE 3000
 
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD curl -f http://localhost:3000/ || exit 1
 
# Use ENTRYPOINT for proper signal handling (PID 1)
ENTRYPOINT ["node"]
CMD ["dist/index.js"]

43 lines~1137 bytes

How to Use

Select your stack and configure the options to match your project.
Download both the Dockerfile and .dockerignore files, or copy the content.
Place both files in the root of your project directory.
Build your image: docker build -t my-app .
Run your container: docker run -p 3000:3000 my-app

Review before deploying. These Dockerfiles are a solid starting point but may need adjustments for your specific project structure, environment variables, and production requirements.

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What is Dockerfile Generator?

Generate optimized, production-ready Dockerfiles for 18 technology stacks including Node.js, Python, Go, Rust, Java, .NET, Ruby, PHP, Next.js, React, Vue, Angular, Django, Flask, FastAPI, Spring Boot, and static sites.

Create a multi-stage Dockerfile for a Django app, an Alpine-based Node.js image, a Spring Boot container, or a FastAPI service in a few clicks. Each template uses multi-stage builds, proper layer caching, non-root users, health checks, and security best practices to keep the final image small. Configure base image versions, ports, package managers, and Alpine vs Debian variants. Generates a matching .dockerignore file alongside. Includes stack-specific optimization tips. All processing runs in your browser.

How to Use Dockerfile Generator

1Select your technology stack from the template grid
2Configure options like base image version, port, and package manager
3Review the generated Dockerfile with syntax highlighting and inline comments
4Copy or download both the Dockerfile and .dockerignore

Frequently Asked Questions

18 stacks: Node.js, Python, Go, Rust, Java (Maven and Gradle), .NET/C#, Ruby, PHP (Laravel and Symfony), Next.js, React, Vue, Angular, Django, Flask, FastAPI, Spring Boot, and static sites with nginx or Apache.

Yes. Templates use multi-stage builds by default to minimize final image size - a build stage installs dependencies and compiles, and a production stage copies only what's needed to run.

Yes. A tailored .dockerignore file is generated alongside every Dockerfile, specific to your chosen stack.

Yes. Every template follows Docker best practices: pinned base image versions, dependency layer caching, non-root users, HEALTHCHECK instructions, and proper signal handling with ENTRYPOINT.

A build stage installs all the dependencies, compilers, and dev tools needed to compile or bundle your app, then a final stage copies only the compiled output and runtime dependencies. The heavy build tooling is discarded, so the image that ships is a fraction of the size.

Alpine images are much smaller and good for most services, but their musl libc can cause issues with some native modules. Debian slim variants are slightly larger but more compatible. The generator lets you switch between them so you can test which works for your stack.

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# Pin to specific version in production, e.g., node:22.11-alpine # Stage 1: Install dependencies FROM node:22-alpine AS deps WORKDIR /app COPY package.json package-lock.json ./ RUN npm ci # Stage 2: Build (if applicable) FROM node:22-alpine AS builder WORKDIR /app COPY --from=deps /app/node_modules ./node_modules COPY . . RUN npm run build # Stage 3: Production image FROM node:22-alpine AS runner LABEL org.opencontainers.image.authors="team@example.com" \ org.opencontainers.image.version="1.0.0" \ org.opencontainers.image.description="Production image" WORKDIR /app ENV NODE_ENV=production # Copy only production dependencies and built output COPY package.json package-lock.json ./ RUN npm ci --omit=dev COPY --from=builder /app/dist ./dist RUN apk add --no-cache curl # Create non-root user for security RUN addgroup -S appusergroup && adduser -S appuser -G appusergroup USER appuser EXPOSE 3000 HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \ CMD curl -f http://localhost:3000/ || exit 1 # Use ENTRYPOINT for proper signal handling (PID 1) ENTRYPOINT ["node"] CMD ["dist/index.js"]

What is Dockerfile Generator?

Frequently Asked Questions

Yes. Templates use multi-stage builds by default to minimize final image size - a build stage installs dependencies and compiles, and a production stage copies only what's needed to run.

Yes. A tailored .dockerignore file is generated alongside every Dockerfile, specific to your chosen stack.

Yes. Every template follows Docker best practices: pinned base image versions, dependency layer caching, non-root users, HEALTHCHECK instructions, and proper signal handling with ENTRYPOINT.