How Can I Efficiently Validate Structs in Go?

Validating Structs Idiomatically

Determining the validity of a struct requires verifying the correctness of each of its fields. This process can become tedious, especially for structs with numerous fields.

The traditional approach, as depicted in the provided code snippet, involves individual validation of each field, raising an error if any field is invalid. While effective, this method can be cumbersome.

An Alternative Solution

The go-validator package (https://github.com/go-validator/validator) offers a structured approach to struct validation. It simplifies the process by expressing field validation rules through annotations.

For instance, the example provided in the package's README employs annotations to specify the following constraints on a NewUserRequest struct:

• Username must contain 3-40 alphanumeric characters.
• Name must not be empty.
• Age must be at least 21.
• Password must be at least 8 characters long.

The validator package then provides a convenient method (validator.Validate) that performs validation based on these annotations. It returns both a boolean indicating validity and a list of errors if validation fails.

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