validasaur@v0.2.2

Validasaur is Deno validation library slightly inspired by Laravel Validation.

Examples

Basic Usage

Write your example.ts like this:

import { validate } from "https://raw.githubusercontent.com/emsifa/validasaur/master/src/mod.ts";
import { required, isNumber } from "https://raw.githubusercontent.com/emsifa/validasaur/master/src/rules.ts";

const inputs = {
  name: "",
  age: "20"
};

const [ passes, errors ] = await validate(inputs, {
  name: required,
  age: [required, isNumber]
});

console.log({ passes, errors });

Run code above with:

deno run example.ts

And this is the result:

{
  "passes": false,
  "errors": {
    "name": {
      "required": "name is required"
    },
    "age": {
      "isNumber": "age must be a number"
    }
  }
}

Formatting Errors

If you want a simpler error message, you can use flattenMessages or firstMessages to format error messages.

For example:

import { validate, flattenMessages, firstMessages } from "https://raw.githubusercontent.com/emsifa/validasaur/master/src/mod.ts";
import { required, isNumber } from "https://raw.githubusercontent.com/emsifa/validasaur/master/src/rules.ts";

const inputs = {
  name: "",
  age: "20"
};

const [ passes, errors ] = await validate(inputs, {
  name: required,
  age: [required, isNumber]
});

const firstErrors = firstMessages(errors);
const flattenErrors = flattenMessages(errors);

// Show the difference
console.log({
  defaultErrors: errors,
  firstErrors,
  flattenErrors
});

Result:

{
  "defaultErrors": {
    "name": {
      "required": "name is required"
    },
    "age": {
      "isNumber": "age must be a number"
    }
  },
  "firstErrors": {
    "name": "name is required",
    "age": "age must be a number"
  },
  "flattenErrors": {
    "name.required": "name is required",
    "age.isNumber": "age must be a number",
    "name": "name is required",
    "age": "age must be a number"
  }
}

Custom Error Message

import { validate, flattenMessages } from "repourl/src/mod.ts";
import { required, isNumber, isString, validateArray, validateObject } from "repourl/src/rules.ts";

const inputs = {
  name: "",
  age: '12',
};

const [passes, errors] = await validate(inputs, {
  name: required,
  age: [required, isNumber],
}, {
  messages: {
    "name": "Nama tidak boleh kosong",
    "age.required": "Usia tidak boleh kosong",
    "age.isNumber": "Usia harus berupa angka",
    // Use this if you want same message for any rule fail
    // "age": "Usia tidak valid"
  },
});

console.log({ passes, errors });

Result:

{
  "passes": false,
  "errors": {
    "name": {
      "required": "Nama tidak boleh kosong"
    },
    "age": {
      "isNumber": "Umur harus berupa angka"
    }
  }
}

Validating Array and Object

import { validate, flattenMessages } from "repourl/src/mod.ts";
import { required, isNumber, isString, validateArray, validateObject } from "repourl/src/rules.ts";

const inputs = {
  name: "",
  age: "20",
  skills: ["PHP", "Node.js", 0, "Deno"],
  address: {
    street: null,
    city: "Jakarta",
    country: "Indonesia",
  }
};

const [ passes, errors ] = await validate(inputs, {
  name: required,
  age: [required, isNumber],

  // validateArray(required: boolean, rules: Rule[])
  skills: validateArray(true, [isString]),

  // validateObject(required: boolean, rules: ValidationRule)
  address: validateObject(true, {
    street: required,
    city: required,
    country: required,
  }),
});

const flattenErrors = flattenMessages(errors);

console.log({ passes, flattenErrors });

Result:

{
  "passes": false,
  "flattenErrors": {
    "name.required": "name is required",
    "age.isNumber": "age must be a number",
    "skills.2.isString": "2 must be a string",
    "address.street.required": "street is required",
    "name": "name is required",
    "age": "age must be a number",
    "skills.2": "2 must be a string",
    "address.street": "street is required"
  }
}