Hoaku Filter

Checks if a variable meets certain requirements, like length or if it matches regex, all in one handy function.

Example usage

const Filter = require("@hoaku/filter");
const filter = new Filter({
    filters: {
        username: {
            prefix: "USERNAME",
            allowedTypes: ["string"],
            minStringLength: 4,
            maxStringLength: 30,
            matchRegex: /^[a-zA-Z0-9_]*$/
        }
    }
});

const username = "realmy!";

const filterResult = filter("username", username);
console.log(filterResult);

This would print out { passed: false, error: 'USERNAME_FORMAT_INCORRECT' }, because the string didn't match the regex pattern.

new Filter(globalSettings)

The class that require("@hoaku/filter") returns.

globalSettings (Object)

• filters (Object): The object where the filters are stored, which are reusable
  • [Filter name] (Object): The filter object, which has settings that apply to the filter.

[Filter name] (Object)

• prefix: The prefix in front of the error messages. For example, if it's "USERNAME", error messages could look like "USERNAME_UNDEFINED". The default value is "INPUT".
• required: Whether or not the variable to check can be undefined. If it is undefined and required is set to false, it would return { passed: true }. If this is incorrect, it returns an error message like PREFIX_UNDEFINED. The default value is true.
• allowedTypes: The types that the variable is allowed to be. If this is incorrect, it returns an error message like PREFIX_WRONG_TYPE. Note: This isn't the same list of types as what typeof can return. These are the types that are allowed:
  • string
  • boolean
  • number (This is both number and bigint)
  • null
  • array
  • object (This only counts as a key-value object, like { hello: "world" })
• minStringLength: The minimum length a string can be. If this is incorrect, it returns an error message like PREFIX_TOO_SHORT.
• maxStringLength: The maximum length a string can be. If this is incorrect, it returns an error message like PREFIX_TOO_LONG.
• matchRegex: The regex pattern a string must match. If this is incorrect, it returns an error message like PREFIX_FORMAT_INCORRECT.