Terraform variables.tf Generator

variables.tf is the file where a Terraform module declares every input it accepts. A clean, consistent variables.tf makes a module approachable and keeps terraform plan output readable. The Terraform variables.tf Generator scaffolds that file from a simple list, so you can add many variables quickly without hand-writing each block.

You add one row per variable with a name, an optional type, an optional default written as a valid HCL literal, a description and a sensitive flag. The tool validates names as Terraform identifiers and detects duplicate names before producing output. Everything runs locally in your browser; nothing is uploaded and no cloud connection is made.

The generated file can be pasted directly into a module, and because each block follows the same ordering it reads well in code review. Strong types and descriptions also feed terraform docs, turning the variables file into living documentation for consumers of the module. By generating the whole file in one pass, you avoid the drift that happens when variables are added at different times by different people.

A good variables.tf also improves collaboration, because reviewers can see at a glance what a module expects and which inputs are optional. This reduces back-and-forth in pull requests and catches missing configuration before a plan ever runs. Because the generator emits valid HCL that matches terraform fmt, you can commit the result directly without a formatting pass, which keeps your pre-commit hooks quiet and your history clean.

• Many variables at once - add as many rows as your module needs in a single pass.
• Typed variables - string, number, bool, list, map and complex object types are all emitted verbatim.
• Default literals - enter any HCL literal default such as a quoted string, a number, a boolean or a collection.
• Descriptions - document every input so plan output and docs are helpful.
• Sensitive flag - mark secrets to redact them in plan and apply output.
• Duplicate detection - the generator flags reused variable names so init cannot fail.
• Identifier validation - names are checked against Terraform naming rules.
• Consistent ordering - every block uses the same attribute order for easy review.
• Blank-tolerant - optional fields can be left empty without breaking the output.
• Bulk friendly - generating many variables together is far faster than editing each block by hand.
• Formatter friendly - output matches terraform fmt so committed files need no extra cleanup.
• Review ready - a generated file is easy for teammates to read and approve.
• Copy and download - export variables.tf as text, a file or printed output.

1. Add variables - click "Add variable" once for each input your module needs.
2. Fill each row - type the name, type, default, description and toggle sensitive as required.
3. Leave optional fields blank - any field you skip is simply omitted from that variable block.
4. Generate the file - press "Generate variables.tf" to validate names and duplicates.
5. Review the preview - read the HCL to confirm each block is correct.
6. Export it - Copy the file, Download variables.tf, or Print it for your records.
7. Commit the result - drop the file into your module so every clone inherits the same inputs.
8. Reuse the pattern - generate variables for every module the same way to keep a consistent standard.

Example - string with default. name=region, type=string, default="us-east-1" yields a variable block with type and default set.

Example - sensitive secret. name=db_password, type=string, sensitive=true produces a variable whose value Terraform redacts in output.

Example - list input. name=subnets, type=list(string), default=["subnet-a", "subnet-b"] creates a typed list default that validates cleanly.

Example - complex object. name=config, type=object({ name = string }), default={ name = "x" } shows how object types and defaults are emitted verbatim.

Example - number input. name=instance_count, type=number, default=2 emits type = number and default = 2 without quotes.

Example - map input. name=tags, type=map(string), default={ env = "prod" } shows how map defaults are emitted verbatim.

• Valid HCL - correct variable block syntax for every entry.
• Reusable modules - parameterise any module with well-typed inputs.
• Documented - descriptions for every input improve clarity.
• Duplicate free - reused names are caught before output.
• Private - the tool runs fully in the browser.
• Consistent style - one pass yields a uniform variables file.
• Onboarding - a complete variables file helps new engineers understand the module quickly.
• Instant export - copy, download or print in one click.
• Clean history - formatted output avoids noisy formatting commits.
• Fewer errors - validation catches name and duplicate mistakes early.