Table of Contents

The Error

When working with Terraform, you may encounter this error:

Error: Invalid type specification; The keyword type is expected to be followed by a type specification

This error can block your entire workflow. Let’s understand why it happens and how to fix it.

What Causes This Error

Syntax error in the variable type declaration — using quotes around type names or invalid type constructors.

How to Fix It

Solution 1

Don’t quote type names: type = string not type = “string”

Solution 2

Use correct complex types: list(string), map(number), set(string)

Solution 3

For objects: type = object({ name = string, count = number })

Solution 4

For optional attributes (TF 1.3+): type = object({ name = string, tag = optional(string) })

Prevention Tips

  • Always run terraform validate before terraform plan
  • Use terraform fmt to keep configuration clean and readable
  • Pin provider versions to avoid unexpected schema changes
  • Review plan output carefully before applying

Learn More

Conclusion

This error is common but straightforward to fix. The key is understanding the root cause and applying the correct solution for your specific situation. Following the prevention tips above will help you avoid this error in future projects.