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const { array, boolean, date, email, exact, integer, matches, max, maxDate, min, minDate, number, object, oneOf, required, string, url, valid, invalid, } = require('validator-fns'); const ONE_DAY = 1000 * 60 * 60 * 24; const TEN_DAYS = ONE_DAY * 10; const now = new Date(); const tenDaysFromNow = new Date(now.getTime() + TEN_DAYS); const customValidator = (value, field) => { if (value === 'hello') { return valid({ value, field }); } return invalid({ message: 'Must be "hello".', value, field, }); }; const validate = object({ firstName: string( { default: '', trim: true }, required('First name is required.') ), emailAddress: string( required('Email address is required.'), email('Must be a valid email address.') ), age: number( { round: 'floor' }, required('Age is required.'), integer('Age must be a whole number.'), min(18, 'Must be at least {min} years old.') ), homepage: string(url('Must be a valid URL.', ['http:', 'https:'])), fruit: string( { default: 'apple' }, oneOf( ['apple', 'orange', 'banana'], ({ values }) => `Must be ${values[0]}, ${values[1]} or ${values[2]}.` ) ), favoriteCarMakers: array( { default: [] }, string( required('Car brand is required.'), oneOf( [ 'BMW', 'Ferrari', 'Fiat', 'Ford', 'Honda', 'Kia', 'Mercedes', 'Subaru', 'Tesla', 'Toyota', 'Volvo', ], 'Must be a known car brand.' ) ), min(2, 'Must pick at least two.'), max(4, 'Must pick at most four.') ), startDate: date( minDate(now, 'Must be on or after today.'), maxDate(tenDaysFromNow, 'Must be at most ten days from now.') ), optIn: boolean(required('Must decide to opt in or out.')), notRobot: number( required('Must enter the correct answer.'), exact(42, 'This is the answer.') ), postalCode: string(matches(/^\d{5}$/, 'Must be a five-digit number.')), custom: customValidator, }); // Later... (async () => { const result = await validate({ age: 20, custom: 'hello', emailAddress: '', favoriteCarMakers: ['Ferrari', 'Tesla'], firstName: 'Bob', fruit: 'apple', homepage: '', notRobot: 42, optIn: false, postalCode: '12345', startDate: new Date(), }); if (result.state === 'valid') { // Do something with the parsed values console.log(result.value); } else { // Handle and display errors console.error(result.errors); } })();

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validator-fns v1.8.2

Small asynchronous validation library

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