Question 1

How do I validate a JSON request body with govalidator?

Accepted Answer

Govalidator can validate JSON by parsing the raw body into a map or struct. You define rules in a MapData or use struct tags, and it returns validation errors. Examples are provided in the 'Validate JSON to map' and 'Validate JSON to nested struct' documentation files.

Question 2

Govalidator vs go-playground/validator: which is better for Go?

Accepted Answer

Govalidator offers a Laravel-inspired syntax that's intuitive for web developers, while go-playground/validator uses struct tags and is more idiomatic to Go. Choose govalidator if you prefer expressive rules; go-playground/validator for tighter integration with Go's type system.

Question 3

Can govalidator validate file uploads for specific extensions?

Accepted Answer

Yes, govalidator has built-in rules for file validation, including 'ext' for extensions and 'mime' for MIME types. You can specify allowed extensions like 'ext:jpg,png' in the validation rules, as shown in the file validation example.

Question 4

How to create a custom validation rule in govalidator?

Accepted Answer

Use the AddCustomRule function to define a custom rule. You provide a function that takes field name, rule, message, and value, and returns an error if validation fails. The README includes an example for a 'word' rule that checks exact word count.

Question 5

Is govalidator suitable for validating nested structs from JSON?

Accepted Answer

Yes, govalidator supports validating nested structs by defining rules for each field. The documentation has a 'Nested Struct' example that shows how to set up rules for complex data hierarchies.

Question 6

What are the performance benchmarks for govalidator?

Accepted Answer

The README links to a benchmark document that compares govalidator with other validation libraries. It provides metrics on validation speed and memory usage, helping you assess performance impact in high-throughput applications.

Question 7

How to handle localized error messages in govalidator?

Accepted Answer

You can pass custom messages in the Options using MapData, where keys are field names and values are arrays of messages. This allows for translation and localization, as demonstrated in the example with Bengali error messages.

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