Question 1

How do I sanitize user input in a Go web app using gookit/filter?

Accepted Answer

Use the filtering API to apply rules like trim, escapeHTML, and type conversion. For example, create a filter instance with input data, add rules for each field (e.g., f.AddRule("name", "trim|ucFirst")), then call Filtering() to get cleaned data ready for safe use in your application.

Question 2

Can I create custom filters in gookit/filter?

Accepted Answer

Yes, the library allows extending filters by implementing custom functions, but the documentation lacks explicit examples; you'll need to refer to the source code or community contributions for guidance on integrating custom logic.

Question 3

What's the difference between gookit/filter and gookit/validate?

Accepted Answer

Filter focuses on data transformation and sanitization, like converting strings to ints or escaping HTML, while Validate is for rule-based validation with error reporting. They are complementary, often used together in web apps for cleaning and then validating data.

Question 4

Is gookit/filter faster than using standard Go libraries for string manipulation?

Accepted Answer

For simple tasks like trimming or case conversion, standard libraries might be more performant due to less overhead, but Filter provides convenience and consistency for batch operations and complex transformations, trading some performance for developer productivity.

Question 5

How to handle errors when converting data with gookit/filter?

Accepted Answer

Use the error-returning functions like Int or String instead of Must versions. Check errors after conversion to ensure data integrity, and handle invalid inputs gracefully in your code, such as logging errors or providing default values manually.

Question 6

Can gookit/filter process JSON or XML data directly?

Accepted Answer

No, Filter operates on Go data types like maps, slices, and strings; you need to unmarshal JSON/XML into these types first, then apply filtering rules, which adds an extra step compared to libraries with built-in format support.

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