opzet
v0.5.7
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Object validation and transformation
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Opzet - JavaScript object validation
A lightweight library that allows for object schema validation. A schema is an object where the keys match the keys of the object you want to validate. Within the schema, each key has an array of 'rules' attached. A rule is simply something that returns nothing or a 'string' indicating the error.
type ValidationError = string;
type Rule = (value: unknown, obj?: object) => ValidationError | null;
type Schema = Record<string, Rule[]>;
Opzet validates each individual rule in the schema. If a key of an object does not comply with one or more rules, all error messages are returned. This allows you to add an order to the rules as well.
import { validate, string, required } from "opzet";
const obj = { key: "value" };
const schema = { key: [string.type], required: [required, string.type] };
validate(obj, schema);
// returns { required: 'required' };
Default rules
Opzet has a set of default rules build in.
import { string, number, boolean, object, array, required } from "opzet";
required
: checks if the value exists or not. If invalid, returns 'required';<string|number|boolean|object|array|datetime>.type
: checks if the value is of the correct type. If invalid, returns 'type';<string|number|array|datetime>.min(num: number | date)
: checks the (inclusive) minimum value/length (e.g.array.length <= num
). Should be applied asarray.min(3)
. If invalid, returns '.min';<string|number|array|datetime>.max(num: number | date)
: checks the (inclusive) maximum value/length (e.g.array.length <= num
). Should be applied asarray.max(3)
. If invalid, returns '.max';string.<email|url|uuid|iban>
: checks if the value is within the correct format. If invalid, returns 'string.';string.enum(allowed: string[])
: checks if the value is one of the allowed string values. If invalid, returns 'string.enum';
For examples, check the tests.