AWS CDK vs Terraform: the honest comparison in 2025
Published: (March 17, 2026 at 03:04 PM EDT)
2 min read
Source: Dev.to
Source: Dev.to
What they are
Terraform
- Declarative HCL.
- Provider‑agnostic (AWS, GCP, Azure, Kubernetes, etc.).
AWS CDK
- Uses TypeScript, Python, Java, etc., to generate CloudFormation.
- AWS‑only.
Comparison
| Aspect | Terraform | AWS CDK |
|---|---|---|
| Language | Explicit, readable HCL – easy to review PRs. | Real programming languages with loops, classes, and full IDE support. |
| Provider support | Provider‑agnostic – same tooling for any cloud. | AWS‑only (generates CloudFormation). |
| Ecosystem | Mature ecosystem, large module registry. | L2/L3 constructs hide AWS complexity behind sensible defaults. |
| Dynamic logic | Verbose (count, for_each). | More expressive; can use standard language features. |
| Testing | Limited to plan/apply checks. | Unit testing with standard frameworks (e.g., Jest, PyTest). |
| Auditability | terraform plan provides an unambiguous preview. | Generated CloudFormation can be thousands of lines, harder to debug. |
| Typical users | Dedicated infra engineers, DevOps‑focused teams, multi‑cloud environments. | Software engineers managing their own infra, AWS‑only shops, teams needing dynamic configuration. |
Code example (AWS CDK – TypeScript)
import * as ecs from 'aws-cdk-lib/aws-ecs';
import * as ecs_patterns from 'aws-cdk-lib/aws-ecs-patterns';
import * as ecr from 'aws-cdk-lib/aws-ecr';
const repo = ecr.Repository.fromRepositoryName(this, 'Repo', 'my-repo');
new ecs_patterns.ApplicationLoadBalancedFargateService(this, 'Svc', {
cluster,
cpu: 256,
memoryLimitMiB: 512,
taskImageOptions: {
image: ecs.ContainerImage.fromEcrRepository(repo),
containerPort: 8080,
},
// ALB, target group, and security groups are created automatically
});Use‑case guidance
- Software engineers owning their own infrastructure – CDK leverages languages they already know.
- Complex, dynamic infrastructure – CDK’s programming model is more expressive.
- AWS‑only shops – CDK’s native constructs provide excellent defaults.
- Dedicated infra engineers or DevOps‑focused teams – Terraform’s explicit HCL and provider‑agnostic nature are advantageous.
- Multi‑cloud or non‑AWS resources – Terraform’s provider ecosystem shines.
- Auditability requirements – Terraform’s clear plan output is often preferred.
Choosing the right tool
- DevOps‑focused team → Terraform.
- Software engineers managing their own infra → CDK.
- Mixed team → Use Terraform for core infrastructure and CDK for application‑level resources that need dynamic configuration.
Real‑world example
Step2Dev selected Terraform for its auditability needs. More details can be found at the project site: