Platform Engineering
Terraform Variable Type Checker
Enter a Terraform type expression and optional default value to validate syntax and type assignment compatibility. Supports all Terraform type constraints including complex object types.
No data is transmitted — everything runs locallyTool
About this tool
Terraform Variable Type Checker
The Terraform Variable Type Checker validates HCL type constraint expressions and checks default value compatibility, covering all Terraform primitive and complex types.
• Validate a complex object type constraint before writing a Terraform module
• Check that a default value is assignable to the declared variable type
• Understand optional() attribute syntax in Terraform object types
• Debug a 'default value is not compatible with type constraint' error
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FAQ
What does this tool tell you?
The Terraform Variable Type Checker validates HCL type constraint expressions and checks default value compatibility, covering all Terraform primitive and complex types.
What affects the result most?
Validates Terraform variable type constraint syntax: string, number, bool, list, map, set, object, tuple. Complex type constructors: list(string), map(number), object({name=string, age=number}), set(any). Optional attributes in object types: object({name=string, tags=optional(map(string), {})}).
How should I use the result?
Treat the tool's output as a first-pass check, not a proof of correctness. A clean pass means no issues in the patterns this tool recognizes; a failure points to a specific problem you can investigate in your source. The underlying spec is the authoritative source for edge cases.
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