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@adairo/schema-validator

v1.0.5

Published

Simple schema validation library inspired by zod

Downloads

17

Readme

Schema Validator

Schema es una pequeña librería de validación basada en esquemas. La API está inspirada en zod y su objetivo es ofrecer una solución de validación simple, personalizada y sin dependencias extras.

Instalación

npm install @adairo/schema-validator

Uso básico

Creando un esquema de tipo string

const s = require("schema");

// creación de un esquema para strings
const schema = s.string();

// parsing
schema.parse("a-string"); // -> { success: true, data: "a-string"}
schema.parse(140); // -> { success: false, error: SchemaError}

Nota: Schema.parse() se comporta como Zod.safeParse()

Creando un esquema de tipo object

const s = require("schema");

// creación de un esquema para objetos
const schema = s.object({
  email: s.string().email(),
  password: s.string().regex(/strong-password-regex/),
});

schema.parse({ email: "invalid-email.com", password: "123" });

Tipos de esquemas

const s = require("schema");

s.string();
s.number();
s.boolean();
s.object();
s.array();

Casting de primitivos

const s = require("schema");

s.number({ coerce: true }).parse("24"); // -> { success: true, data: 24 }
s.string({ coerce: true }).parse(25); // -> { success: true, data: "25" }
s.boolean({ coerce: true }).parse(0); // -> { success: true, data: false }

Métodos en común de todos los esquemas

schema.optional(); // El esquema ignora las validaciones si se le pasa un valor undefined

schema.transform(fn); // Recibe una función para transformar el valor

schema.assert(fn); // Recibe una función que valida y lanza una exepción en caso de error

// Ejemplo
const schema = s.object({
  query: s.object({
    limit: s.number({ coerce: true }).min(1).optional(),
    byOrder: s
      .string()
      .transform((v) => v.toUpperCase())
      .assert((order) => {
        if (order !== "ASC" && order !== "DESC") {
          throw new Error("'ASC' y 'DESC' son los únicos valores permitidos");
        }
      }),
  }),
});

schema.parse({ query: { byOrder: "asc" } }); // -> { success: true, data: { query: { byOrder: "ASC" } } }

StringSchema

// Validaciones
s.string().min(5);
s.string().max(10);
s.string().uuid();
s.string().email();
s.string().regex();

// transformaciones
s.string().trim();

NumberSchema

// Validaciones
s.number().min(5);
s.number().max(10);

ObjectSchema

// Utilidades
s.object({ keyA: s.string() }).extend(s.object({ keyB: s.number() }));
// Equivalente a
s.object({ keyA: s.string(), keyB: s.number() });

ArraySchema

// Validaciones
s.array().min(2);
s.array().max(10);
s.array().nonempty(); // equivalente a array().min(1)
s.array().length(5);

Manejo de errores

Cuando el método schema.parse() falla la validación, regresa un objeto con la siguiente forma:

{ success: false, error: SchemaError }

La clase SchemaError hereda de la clase Error y tiene un miembro issues que es un arreglo de todos los errores que se encontraron en la validación.

const schema = s.object({
  nestedA: s.object({
    keyA: s.string(),
    keyB: s.string(),
  }),
  nestedB: s.object({
    keyAB: s.string(),
  }),
});

schema.parse({ nestedA: {} });
/**
 * Resultado:
 * {
 *   success: false,
 *   error: {
 *     issues: [
 *       { message: "Valor undefined", path: ["nestedA", "keyA"] },
 *       { message: "Valor undefined", path: ["nestedA", "keyB"] },
 *       { message: "Valor undefined", path: ["nestedB"] },
 *     ]
 *   }
 * }
 *
 */