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    node-input-validator

    4.4.1 • Public • Published

    Validation Library

    NPM version build status Known Vulnerabilities Coverage Status David deps node version

    Validation library for node.js

    NIV (Node Input Validator) is a validation library for node.js. You can also extend library to add custom rules.

    Note: For use case of any rule, please check test cases, If you have any doubt or confusion with documentation or rule behaviour.

    Installation

    npm i node-input-validator

    Features

    • large collection of rules
    • add your own custom rules
    • supports nested inputs
    • declare rules as strings or array
    • post validation rules
    • modify or add new messages in your own language
    • change attribute names globally or locally
    • current supported languages: English, Persian(farsi)

    Usage

    Simple Example

    const { Validator } = require('node-input-validator');
    
    const v = new Validator(
      { name: '' },
      { name: 'required|minLength:5' },
    );
    
    v.check().then(function (matched) {
      console.log(matched);
      console.log(v.errors);
    });

    With in express application

    const { Validator } = require('node-input-validator');
    
    app.post('login', function (req, res) {
      const v = new Validator(req.body, {
        email: 'required|email',
        password: 'required'
      });
    
      v.check().then((matched) => {
        if (!matched) {
          res.status(422).send(v.errors);
        }
      });
    });

    With async-await

    const { Validator } = require('node-input-validator');
    
    router.post('login', async (ctx) => {
      const v = new Validator(ctx.request.body, {
        email: 'required|email',
        password: 'required'
      });
    
      const matched = await v.check();
    
      if (!matched) {
        ctx.status = 422;
        ctx.body = v.errors;
        return;
      }
    });

    For Koa2

    Attach koa middleware

    const niv = require('node-input-validator');
    
    // keep this under your error handler
    app.use(niv.koa());

    Then in controller

    // if validation fails, this will auto abort request with status code 422 and errors in body
    await ctx.validate({
      name: 'required|maxLength:50',
      username: 'required|maxLength:15',
      email: 'required|email',
      password: 'required'
    });
    
    // validation passes
    // do some code

    With custom inputs

    // if validation fails, this will auto abort request with status code 422 and errors in body
    await ctx.validate({
      name: 'required|maxLength:50',
      username: 'required|maxLength:15',
      email: 'required|email',
      password: 'required'
    }, ctx.request.body);
    
    // validation passes
    // do some code

    With custom inputs and custom messages

    // if validation fails, this will auto abort request with status code 422 and errors in body
    await ctx.validate({
      name: 'required|maxLength:50',
      username: 'required|maxLength:15',
      email: 'required|email',
      password: 'required'
    }, ctx.request.body, { email: 'E-mail is required' });
    
    // validation passes
    // do some code

    In case you wants control over validator, Then use

    // if validation fails, this will auto abort request with status code 422 and errors in body
    const v = await ctx.validator(ctx.request.body, {
      name: 'required|maxLength:50',
      username: 'required|maxLength:15',
      email: 'required|email',
      password: 'required'
    });
    
    // in case validation fails
    if (v.fails()) {
      ctx.status = 422;
      ctx.body = v.errors;
      return;
    }
    
    // do some code
    This method (ctx.validator(inputs, rules, messages={})) also support same options as like ctx.validate

    Objects Validation

    Example 1

    const v = new Validator(
      {
        product: {
          id: '1',
          name: '',
          price: '',
          active: 'yes',
        }
      },
      {
        'product': 'required|object',
        'product.id': 'required|integer',
        'product.name': 'required',
        'product.price': 'required|integer',
        'product.active': 'required|integer'
      },
    );
    
    const matched = await v.check();

    Array Validation

    Example 1

    let v = new Validator(
      {
        roles: ['admin', 'manager', 'member']
      },
      {
        'roles': 'required|array',
        'roles.*': 'required|string'
      },
    );
    
    let matched = await v.check();

    Example 2

    let v = new Validator(
      {
        plan: [
          { price: '25', title: 'OK' },
          { price: '', title: '' },
          { price: '30' },
          { price: '', title: 'Title' }
        ]
      },
      {
        'plan': 'required|array',
        'plan.*.price': 'required|integer',
        'plan.*.title': 'required'
      },
    );
    let matched = await v.check();

    Add or Modify messages

    Placeholder in messages, :attribute will be replaced with field/attribute name, :value with field value and :arg0, :arg1 ...n with arguments passed to rule.

    Add/Update rule based messages

    const niv = require('node-input-validator');
    /**
     * @param {Object} messages
     * @param {string?=en} language
     */
    niv.extendMessages({
      required: 'The :attribute field must not be empty.',
      email: 'E-mail must be a valid email address.',
      even: 'The value of the field must be even number.',
      status: 'Invalid status'
    }, 'en');

    Add custom messages

    const niv = require('node-input-validator');
    //Note: Default language is English (en).
    niv.addCustomMessages({
      'username.required': 'When username attribute required rule failed.',
      username: 'Default message for username attribute.'
    });

    for message in another language

    You can easliy add messages in another language.

    const niv = require('node-input-validator');
    niv.extendMessages({
      required: ':attribute ਫੀਲਡ ਖਾਲੀ ਨਹੀਂ ਹੋਣਾ ਚਾਹੀਦਾ.',
    }, 'pb');

    Set default language

    const niv = require('node-input-validator');
    niv.setLang('pb');

    Toggle Multiple Errors Support

    By default, Validator will run in bailable mode ie. break if some rule failed. You can change this behaviour:

    Globally

    const niv = require('node-input-validator');
    niv.bailable(false);

    Now instead of breaking, it will continues apply other rules.

    Errors example

    {
      name: [
        {
          rule: 'minLength',
          message: '...',
        },
        {
          rule: 'alpha',
          message: '...',
        }
      ]
    }

    Locally

    To toggle multiple errors on specific instance only.

    const niv = require('node-input-validator');
    const v = new niv.Validator(inputs, rules);
    v.bail(false);

    Set attribute nice/custom name

    You can also declare Nice Names / Custom Attributes names.

    const niv = require('node-input-validator');
    niv.niceNames({
      phone: 'phone number',
      dob: 'Date of Birth'
    });

    If your are editing other languages, set lang parameter.

    const niv = require('node-input-validator');
    niv.niceNames({
      phone: 'phone number',
      dob: 'Date of Birth'
    },'fa');

    In error messages you will get "phone number" instead of phone. For Example: In case required rule failed, Error message will be: The phone number field is mandatory.

    For current instance only

    const niv = require('node-input-validator');
    
    const v = new niv.Validator(inputs, rules);
    v.niceNames({
      phone: 'phone number',
      dob: 'Date of Birth'
    });

    This will only change attribute names for current instance.

    Add your own custom validation rules

    // second params will be the instance of Validator
    niv.extend('even', ({ value }) => {
      if ((parseInt(value) % 2) == 0) {
        return true;
      }
      return false;
    });

    Example of using other fileds in rule

    const niv = require('node-input-validator');
    
    niv.extend('sumOfFields', ({ value, args }, validator) => {
      if (args.length !== 2) {
        throw new Error('Invalid seed for rule sumOfFields');
      }
    
      const anotherValue = Number(validator.inputs[args[0]]);
    
      const eq = Number(args[1]);
    
      if ((Number(value) + anotherValue) !== eq) {
        return false;
      }
    
      return true;
    });
    
    let v = new niv.Validator(
      { num1: '50', num2: '50' },
      { num1: 'sumOfFields:num2,100|required' },
    );
    
    let matched = await v.check();
    
    assert.equal(matched, true);

    Example of using async rules

    // use this rules as unique:seed
    // unique:<Mongoose Model>,<Field Name>,<ID to Ignore, This is optional>
    
    const niv = require('node-input-validator');
    const mongoose = require('mongoose');
    
    niv.extend('unique', async ({ value, args }) => {
      // default field is email in this example
      const filed = args[1] || 'email';
    
      let condition = {};
    
      condition[filed] = value;
    
      // add ignore condition
      if (args[2]) {
        condition['_id'] = { $ne: mongoose.Types.ObjectId(args[2]) };
      }
    
      let emailExist = await mongoose.model(args[0]).findOne(condition).select(field);
    
      // email already exists
      if (emailExist) {
        return false;
      }
    
      return true;
    });
    
    // example usage of upper extended rule
    
    new niv.Validator({
      email: 'required|email|unique:User,email'
    }, inputs);
    
    // in case to ignore specific id
    
    new niv.Validator({
      email: 'required|email|unique:User,email,5c2f29e9cefa7718a54f8ff1'
    }, inputs);

    Example of using rules as array

    const niv = require('node-input-validator');
    
    let v = new niv.Validator(
      { foo: 'bar'},
      { foo: ['required', 'string', ["minLength", 5]] },
    );
    
    let matched = await v.check();
    
    assert.equal(matched, true);
    
    v = new niv.Validator(
      { foo: 'bar'},
      { foo: ['required', 'string', "minLength:5" ] },
    );
    
    matched = await v.check();
    
    assert.equal(matched, true);

    Rules

    You can check test cases for rule usage/examples.

    required
    The field under validation cannot be left blank.

    // should fail
    new Validator(
      { name: '' },
      { name: 'required' },
    );

    requiredIf:field,value
    The field under validation cannot be left blank, if provided seed value equals to provided value seed.

    // requiredIf rule validation fails, becoz email cannot be left blank if age is 16
    new Validator(
      { email: '', age: '16' },
      { email: 'requiredIf:age,16' },
    );

    requiredNotIf:field,value
    The field under validation may left blank, if provided seed value equals to provided value seed.

    // requiredNotIf rule validation fails, becoz transport must be present in case age is not 16
    new Validator(
      { transport: '', age: '15' },
      { transport: 'requiredNotIf:age,16' },
    );

    requiredWith:field
    requiredWith:field,field,field
    The field under validation may required in case provided seed present.

    // requiredWith rule validation fails, becoz email must in case age present.
    new Validator(
      { email: '', age: '17' },
      { email: 'requiredWith:age' },
    );

    requiredWithout:field
    requiredWithout:field,field,field
    The field under validation may left blank in case provided seed present.

    // requiredWithout rule validation fails, becoz email is must in case phone,pan not provided.
    new Validator(
      { email: '', username: '' },
      { email: 'requiredWithout:phone,pan', username: 'requiredWithout:email' },
    );

    accepted
    The field under validation must be yes, on, 1, or true.

    accepted:seeds
    The field under validation must be accepted if value exists in provided seed.

    after:YYYY-MM-DD
    The field under validation must be date after provided seed.

    new Validator(
      { joining: '' },
      { joining: 'required|after:2018-02-10' },
    );

    alpha
    alpha:locale
    The field under validation must be entirely alphabetic characters.

    alphaDash
    The field under validation may have alpha-numeric characters, as well as dashes and underscores.

    alphaNumeric
    alphaNumeric:locale The field under validation only contains letters and numbers.

    array
    The field under validation must be an array.

    arrayUnique
    Added in: v3.5
    The field under validation must be an array and must contains unique values. No need to use array rule. This rule will take care of that.

    arrayUniqueObjects:attributes
    Added in: v3.5
    The field under validation must be an array and should have objects with unique attributes as per seed. No need to use array rule. This rule will take care of that.

    ascii
    The field under validation only contains ascii characters.

    base64
    The field under validation must be valid base64 encoded string.

    between:min,max
    The field under validation must be betwwen min and max seed. This will work with number valus as well as with arrays using array count.

    boolean
    boolean:custom
    The field under validation must be boolean (true, false, 'true', 'false', 0, 1, '0', '1') or in custom seed.

    contains:value
    The field under validation must contains provided seeds.

    let v = new Validator({bio:'My profile is: example.com'}, {bio:'required|contains:profile'});

    creditCard
    The field under validation must be valid credit card string.

    date
    The field under validation must be a valid date (YYYY-MM-DD).

    dateAfterToday:number,unit
    The field under validation must be a valid date after provided seed.

    new Validator(
      { expiry: '2019-02-28' },
      { expiry: 'required|dateAfterToday:2,days' },
    );

    see moment docs(https://momentjs.com/docs/#/manipulating/add/) for supported units.

    dateBeforeToday:number,unit
    The field under validation must be a valid date before provided seed.

    let v = new Validator({valid:'2019-02-28'}, {valid:'required|dateBeforeToday:2,months'});

    dateFormat:format
    The field under validation must match the given date format.

    Note: use array of rules style declaration to deal with colon (:) in time formats.

    new Validator(
      { dob: '' },
      { dob: 'required|dateFormat:YYYY-MM-DD' },
    );

    Check https://momentjs.com/docs/ for supported formats

    dateiso
    Added in: v3.6
    The field under validation must be a valid iso date.

    datetime
    Added in: v3.6
    The field under validation must match YYYY-MM-DD HH:mm:ss format.

    decimal
    The field under validation must be a decimal value.

    digits:length
    The field under validation must be numeric and must have an exact length.

    digitsBetween:min,max
    The field under validation must have a length between provided min and max values.

    domain
    The field under validation must a qualified domain.

    dimensions:seed
    Added in: v3.7
    The image under validation must meet the dimension constraints as specified by in seed.

    new Validator(
      req.body,
      { file: 'dimensions:minWidth=50,minHeight=50' },
    );
    
    const matched = await v.check();
    
    assert.equal(matched, false);

    Note: image mimes validation is required before.

    Available constraints are: minWidth, maxWidth, minHeight, maxHeight, width, height.

    email
    The field under validation must be formatted as an e-mail address.

    equals
    The field under validation must be equal to given value.

    gt:another_field
    Added in: v3.4
    The field under validation must be greater then another field value. This rule is for Numbers comparision.

    gte:another_field
    Added in: v3.4
    The field under validation must be greater or equals to another field value. This rule is for Numbers comparision.

    hash:algo
    The field under validation must be a valid hash as per provided seed.

    new Validator(
      {
        id: 'fd1baf48377a9f644f9af89abbee29f6'
      },
      {
        id: 'required|hash:md5'
      },
    );

    Supported algorithms: md4, md5, sha1, sha256, sha384, sha512, ripemd128, ripemd160, tiger128, tiger160, tiger192, crc32, crc32b.

    hex
    The field under validation must be valid hex.

    hexColor
    The field under validation must be valid hex color code.

    in:a,b...n
    The field under validation must exist in the given list of values.

    new Validator(
      { status: '' },
      { status: 'required|in:active,inactive,blocked' },
    );

    integer
    The field under validation must be an integer.

    ip
    The field under validation must be an IP address.

    iso8601
    The field under validation must be valid Iso8601 date.

    json
    The field under validation must be a valid JSON string.

    length:max
    length:max,min
    Added in: v3.5
    The field under validation must be less then or equals to max seed provided in rule. In case of min,max seed, field under validation must be less or equals to max seed and less then min seed. Can only be used with strings|arrays or any other object that supports length (str.length) property.

    latLong
    The field under validation must be a valid latitude-longitude coordinate.

    lengthBetween:min,max
    The field under validation value length must be between provided values.

    let v = new Validator({age:''}, {age:'required|between:17,30'});

    lt:another_field
    Added in: v3.4
    The field under validation must be less then another field value. This rule is for Numbers comparision.

    lte:another_field
    Added in: v3.4
    The field under validation must be less or equals to another field value. This rule is for Numbers comparision.

    macAddress
    The field under validation should be a valid Mac Address.

    max:seed
    The field under validation must be less than given value.

    new Validator(
      { age: '' },
      { age: 'required|max:35' },
    );

    maxLength:seed
    The length of field under validation should be less than given value.

    new Validator(
      { username: '' },
      { username: 'required|max:10' },
    );

    mime:seed
    The file under validation must have a MIME type corresponding to one of the listed extensions.

    new Validator(
      req.body,
      { file: 'required|mime:jpg,png' },
    );

    min
    The field under validation must be greater than given value.

    minLength
    The length of field under validation should be greater than given value.

    mongoId
    The field under validation should be a valid MongoDB ID.

    notContains:seed
    The field under validation may not contains provided seeds.

    notIn:seeds
    The field under validation must not exist in the given list of values.

    nullable
    The field under validation is required only is not left empty.

    numeric
    The field under validation must be numeric.

    phoneNumber
    The field under validation must be a valid phone number.

    regex
    The field under validation must match the given regular expression.

    Note: Currently regex rules break on using colon (:) or pipe delimiters. Use array of rules style declaration instead of string.

    new Validator(
      req.body,
      { username: ['required', 'regex:[a-z]'] },
      { password: 'required|same:confirm_password' },
    );

    same
    The given field must match the field under validation.

    size:max
    size:max,min
    The file field under validation must have a file size matching the given maximum value or should be between size range. Supported unit sufix: b(Bytes),kb/k(KilloBytes),mb/m(MegaBytes),gb/g(GigaBytes).

    // in below case, image file size should be under 4kb limit
    new Validator({image:''}, {image:'required|size:4kb'});
    // in below case, image file size should be between 1kb - 4kb
    new Validator({image:''}, {image:'required|size:4kb,1kb'});
    new Validator({video:''}, {video:'required|size:10mb'});

    sometimes
    The field under validation is required if present.

    string
    The field under validation must be string.

    url
    The field under validation must be a valid URL.

    Post Rules
    There is set of rules which can be used to validate constraints of whole input, rather than validity of singular fields.

    const v = new Validator(
      { name: '' },
      { '*': 'any:name,surname' },
    );
    
    v.check().then(function (matched) {
      console.log(matched);
      console.log(v.errors);
    });

    Post validator errors are returned in the * key. There is also possibility to add custom function as validator with help of addPostRule method. Function will be called in context of validator object with input as parameter.

    const v = new Validator(
      { username: 'arnold', password: 'arnold123' },
      { username: 'required', password: 'required' },
    );
    
    v.addPostRule((provider) => {
      if (provider.inputs.password.indexOf(provider.inputs.username) >= 0) {
        provider.error('password', 'custom', 'Password cannot contain username');
      }
    });

    any
    Any of the fields must be present in input.

    all
    All of the fields must be present in input.

    Typescript Support

    Partial Support.

    Install

    npm i node-input-validator

    DownloadsWeekly Downloads

    6,745

    Version

    4.4.1

    License

    ISC

    Unpacked Size

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    Total Files

    191

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