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Rut.ts
https://github.com/arrowsw/rut.ts
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A TypeScript library for validating, formatting, and handling Chilean RUT (Rol Único Tributario)
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# rut.ts rut.ts is a TypeScript library for handling Chilean RUT (Rol Único Tributario) values. The RUT is Chile's unique identification number used for tax purposes, legal identification, government services, and banking transactions. The standard format is `XX.XXX.XXX-Y` where X represents the body (7-8 digits) and Y is the verifier digit (0-9 or K) calculated using the Modulo 11 algorithm. The library provides comprehensive RUT operations including validation, formatting, cleaning, decomposition, generation, and verifier calculation. All functions support a "safe mode" via `throwOnError: false` that returns `null` instead of throwing errors, making it ideal for form handling and user input processing. The library works in both Node.js and browser environments with full TypeScript support. ## validate() Validates a RUT string by checking both format and verifier digit correctness. Accepts `unknown` input type for type safety, with optional strict mode to reject suspicious patterns like repeated digits (e.g., 11.111.111-1). ```typescript import { validate } from 'rut.ts' // Basic validation validate('12.345.678-5') // true validate('12.345.678-0') // false (wrong verifier) validate('12345678-5') // true (without dots) validate('123456785') // true (no formatting) validate('14.625.621-K') // true (K verifier) // Invalid inputs validate('abc') // false validate('') // false validate(null) // false validate(123) // false // Strict mode rejects suspicious patterns validate('11.111.111-1', { strict: true }) // false validate('22.222.222-2', { strict: true }) // false validate('11.111.111-1') // true (without strict) // Type-safe validation function processUserInput(input: unknown) { if (validate(input)) { console.log('Valid RUT') } } ``` ## format() Converts RUT strings into a standardized format with dots and hyphens. Supports incremental formatting for real-time input formatting as users type, with options to include/exclude dot separators. ```typescript import { format } from 'rut.ts' // Standard formatting format('123456785') // '12.345.678-5' format('9068826K') // '9.068.826-K' format('123456785', { dots: false }) // '12345678-5' // Handles various input formats format('12.345.678-5') // '12.345.678-5' format('12-345-678-5') // '12.345.678-5' format(' 123456785 ') // '12.345.678-5' format('00012345678') // '1.234.567-8' (leading zeros removed) // Incremental formatting (for real-time input) format('1', { incremental: true }) // '1' format('1234', { incremental: true }) // '1.234' format('12345678', { incremental: true }) // '1.234.567-8' format('123456785', { incremental: true }) // '12.345.678-5' // Safe mode (returns null instead of throwing) format('invalid', { throwOnError: false }) // null format('123', { throwOnError: false }) // null // React input handler example const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => { const formatted = format(e.target.value, { incremental: true }) setRut(formatted) } ``` ## clean() Removes extraneous characters (dots, hyphens, spaces) and leading zeros from RUT strings, returning a normalized uppercase version suitable for database storage or API calls. ```typescript import { clean } from 'rut.ts' // Basic cleaning clean('12.345.678-5') // '123456785' clean(' 12-345-678-5 ') // '123456785' clean('00012345678K') // '12345678K' clean('12345678k') // '12345678K' (uppercase) // Handles various formats clean('12#345$678%5') // '123456785' clean('(12.345.678-5)') // '123456785' // Safe mode clean('invalid', { throwOnError: false }) // null clean('123', { throwOnError: false }) // null (too short) // Practical usage const handleInput = (value: string) => { const cleaned = clean(value, { throwOnError: false }) if (cleaned) { saveToDatabase(cleaned) } else { showError('Invalid RUT format') } } ``` ## decompose() Splits a RUT into its body and verifier digit components, returning an object with both parts. Useful for storing RUT parts separately or comparing RUT bodies. ```typescript import { decompose } from 'rut.ts' // Basic decomposition const { body, verifier } = decompose('12.345.678-5') console.log(body) // '12345678' console.log(verifier) // '5' // K verifier const rut = decompose('9.068.826-K') console.log(rut.body) // '9068826' console.log(rut.verifier) // 'K' // Safe mode const result = decompose('invalid', { throwOnError: false }) console.log(result) // null // Store body and verifier separately const { body: rutBody, verifier: rutVerifier } = decompose('12.345.678-5') await db.users.create({ rutBody: rutBody, // '12345678' rutVerifier: rutVerifier // '5' }) // Compare RUT bodies const rut1 = decompose('12.345.678-5') const rut2 = decompose('12345678-5') if (rut1.body === rut2.body) { console.log('Same person') } ``` ## getBody() Extracts just the body (without verifier digit) from a RUT string. A convenience function for when you only need the body portion. ```typescript import { getBody } from 'rut.ts' // Basic extraction getBody('12.345.678-5') // '12345678' getBody('18.972.631-7') // '18972631' getBody('9.068.826-K') // '9068826' // Safe mode getBody('invalid', { throwOnError: false }) // null // Use for database queries const body = getBody('12.345.678-5') const users = await db.users.findMany({ where: { rutBody: body } }) ``` ## getVerifier() Extracts just the verifier digit from a RUT string. Returns a single character ('0'-'9' or 'K'), always uppercase. ```typescript import { getVerifier } from 'rut.ts' // Basic extraction getVerifier('12.345.678-5') // '5' getVerifier('18.972.631-7') // '7' getVerifier('9.068.826-K') // 'K' getVerifier('9068826k') // 'K' (converted to uppercase) // Safe mode getVerifier('invalid', { throwOnError: false }) // null // Verify correctness manually import { calculateVerifier, getBody } from 'rut.ts' const rut = '12.345.678-5' const body = getBody(rut) const verifier = getVerifier(rut) const calculated = calculateVerifier(body) if (verifier === calculated) { console.log('Verifier is correct!') } ``` ## calculateVerifier() Calculates the verifier digit for a given RUT body using the Modulo 11 algorithm. Useful for generating custom RUTs or verifying RUT correctness. ```typescript import { calculateVerifier, format } from 'rut.ts' // Basic calculation calculateVerifier('12345678') // '5' calculateVerifier('18972631') // '7' calculateVerifier('24657622') // 'K' calculateVerifier('14625621') // 'K' // Build a complete RUT const body = '12345678' const verifier = calculateVerifier(body) const completeRut = format(body + verifier) console.log(completeRut) // '12.345.678-5' // Safe mode calculateVerifier('123', { throwOnError: false }) // null (too short) // Accepts formatted input calculateVerifier('18.972.631') // '7' calculateVerifier('18-972-631') // '7' // Form validation const handleBodyInput = (body: string) => { const verifier = calculateVerifier(body, { throwOnError: false }) if (verifier) { console.log(`Complete RUT: ${body}-${verifier}`) } else { console.log('Invalid body length or format') } } ``` ## generate() Generates random valid RUT numbers for testing and development purposes. Returns formatted RUTs with dots and hyphens that pass validation. ```typescript import { generate, validate, decompose } from 'rut.ts' // Generate single RUT const rut = generate() console.log(rut) // e.g., '45.123.789-2' // Generate multiple RUTs const ruts = Array.from({ length: 10 }, () => generate()) console.log(ruts) // ['18.972.631-7', '45.123.789-2', '67.890.123-K', ...] // All generated RUTs are valid const testRuts = Array.from({ length: 100 }, () => generate()) testRuts.forEach(rut => { console.assert(validate(rut) === true) console.assert(validate(rut, { strict: true }) === true) }) // Seed test database const testUsers = Array.from({ length: 50 }, (_, i) => { const rut = generate() const { body, verifier } = decompose(rut) return { id: i + 1, name: `Test User ${i + 1}`, rut: rut, rutBody: body, rutVerifier: verifier } }) await db.users.insertMany(testUsers) ``` ## isRutLike() Quick format check to determine if a string looks like a RUT, without validating the verifier digit. Faster than `validate()` for early filtering. ```typescript import { isRutLike, validate } from 'rut.ts' // Valid formats isRutLike('12.345.678-9') // true isRutLike('12345678-9') // true (no dots) isRutLike('123456789') // true (no formatting) isRutLike('1.234.567-K') // true (7-digit body) // Invalid formats isRutLike('abcdefgh') // false isRutLike('') // false isRutLike('12.34.56-7') // false (wrong pattern) // Difference from validate() const rut = '12.345.678-0' // Wrong verifier (should be 5) isRutLike(rut) // true (format is correct) validate(rut) // false (verifier is wrong) // Quick filter before validation const inputs = ['12.345.678-5', 'invalid', '18.972.631-7', 'abc'] const potentialRuts = inputs.filter(isRutLike) // ['12.345.678-5', '18.972.631-7'] // Pre-validation performance optimization function validateRut(input: unknown): boolean { if (typeof input !== 'string' || !isRutLike(input)) { return false } return validate(input) // Full validation only if format matches } ``` ## React Hook Form Integration Integrate rut.ts with React Hook Form for form validation with automatic formatting. ```typescript import { useForm } from 'react-hook-form' import { validate, format } from 'rut.ts' type FormData = { rut: string; name: string } function MyForm() { const { register, handleSubmit, setValue, formState: { errors } } = useForm<FormData>() const onSubmit = (data: FormData) => { console.log('Valid RUT:', data.rut) } return ( <form onSubmit={handleSubmit(onSubmit)}> <input {...register('rut', { required: 'RUT is required', validate: (value) => validate(value) || 'RUT is invalid', onChange: (e) => { const formatted = format(e.target.value, { incremental: true }) setValue('rut', formatted) } })} placeholder="12.345.678-5" /> {errors.rut && <span>{errors.rut.message}</span>} <button type="submit">Submit</button> </form> ) } ``` ## Zod Schema Validation Use rut.ts with Zod for schema-based validation in TypeScript applications. ```typescript import { z } from 'zod' import { validate, clean } from 'rut.ts' const userSchema = z.object({ name: z.string(), rut: z.string().refine( (val) => validate(val), { message: 'Invalid RUT' } ), email: z.string().email() }) // Usage const result = userSchema.safeParse({ name: 'Juan Pérez', rut: '12.345.678-5', email: 'juan@example.com' }) if (result.success) { const cleanedRut = clean(result.data.rut) console.log('Valid data:', { ...result.data, rut: cleanedRut }) } // Next.js Server Action 'use server' export async function createUser(formData: FormData) { const data = { rut: formData.get('rut') as string } const result = userSchema.safeParse(data) if (!result.success) { return { error: result.error.flatten() } } const cleanedRut = clean(data.rut) await db.users.create({ data: { rut: cleanedRut } }) return { success: true } } ``` ## TypeScript Types The library exports TypeScript types for all options and return values. ```typescript import type { DecomposedRut, FormatOptions, SafeOptions, ValidateOptions, VerifierDigit } from 'rut.ts' // DecomposedRut: { body: string; verifier: string } // FormatOptions: { incremental?: boolean; dots?: boolean; throwOnError?: boolean } // SafeOptions: { throwOnError?: boolean } // ValidateOptions: { strict?: boolean } // VerifierDigit: '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' | 'K' ``` rut.ts is primarily designed for Chilean applications that need to handle RUT values in forms, databases, and APIs. Common use cases include user registration forms with real-time RUT formatting, API input validation, database normalization (storing clean RUTs), and generating test data for development. The incremental formatting feature is particularly useful for improving UX in form inputs by formatting RUTs as users type. The library integrates seamlessly with popular form libraries (React Hook Form, Formik), validation libraries (Zod, Yup), and frameworks (Next.js, React). For optimal usage, use `format()` with `incremental: true` for real-time input formatting, always validate with `validate()` before processing, use `clean()` before storing to databases, and leverage safe mode (`throwOnError: false`) for graceful error handling in user-facing applications.