I built a free tool to generate AWS architecture diagrams from Terraform — no signup, no credentials needed

#devops #terraform #opensource #aws

When someone asks "can you show me the architecture?",
most DevOps engineers groan internally.

Not because the architecture is complicated — because
drawing it is. You open draw.io, spend 45 minutes dragging
boxes, and by the time you share it, someone has already
changed the infrastructure.

Existing automated tools like Cloudcraft want $49/month
and read access to your AWS account. That's a non-starter
for most individual engineers and small teams.

So I built InfraSketch.

What it does

Paste your Terraform HCL or docker-compose.yml → get a
clean architecture diagram instantly.

Parses 25+ AWS resource types
Detects relationships between resources automatically
Groups by category (Networking, Compute, Database, Storage, Load Balancing, Messaging, Security)
Uses official AWS Architecture icons
Export as PNG, SVG, or draw.io file
100% client-side — your code never leaves your browser
No signup, no cloud credentials, completely free

How it works

The tool does static analysis of your HCL code using a
custom JavaScript parser. It extracts resource type and
name from each resource block, detects cross-references
between resources, groups them visually by category, and
renders the diagram as SVG with official AWS icons.

Everything runs in your browser. There is no backend server.

Try it with this example

Paste this into InfraSketch:

resource "aws_vpc" "main" {
  cidr_block = "10.0.0.0/16"
}

resource "aws_subnet" "public" {
  vpc_id     = aws_vpc.main.id
  cidr_block = "10.0.1.0/24"
}

resource "aws_internet_gateway" "gw" {
  vpc_id = aws_vpc.main.id
}

resource "aws_lb" "app" {
  name               = "app-alb"
  load_balancer_type = "application"
  subnets            = [aws_subnet.public.id]
}

resource "aws_eks_cluster" "main" {
  name     = "production"
  role_arn = aws_iam_role.eks.arn
  vpc_config {
    subnet_ids = [aws_subnet.public.id]
  }
}

resource "aws_iam_role" "eks" {
  name = "eks-role"
  assume_role_policy = jsonencode({})
}

resource "aws_db_instance" "db" {
  identifier     = "prod-db"
  engine         = "postgres"
  instance_class = "db.t3.medium"
}

resource "aws_s3_bucket" "assets" {
  bucket = "my-app-assets"
}

resource "aws_sqs_queue" "events" {
  name = "event-queue"
}

You'll see VPC, subnet, IGW, ALB, EKS, IAM, RDS, S3, and
SQS — all grouped, connected, and rendered with official
AWS icons.

The draw.io export

One feature people find particularly useful — after
generating the diagram you can export it as a draw.io file.
This means InfraSketch generates the base structure
automatically, then you open it in diagrams.net and
customize it for presentations or documentation. Best of
both worlds.