Install

npm install node-valid

Example

var valid = require('node-valid'); v = new valid();

var user = 'biguser001', pass = 'Str0ngP@ss', match = 'Str0ngP@ss';

// user validation
v.validate(user, 'user');
v.required().minLength(4).noWhitespace();

// pass validation, even better single line
v.validate(pass, 'pass').required().minLength(8).noWhitespace();

// pass match validation
v.validate(match, 'match').matches(pass);

// check all validation rules
if(v.isValid()) {
    console.log('Validation successful!');
} else {
    // display errors, 'getErrors()' returns an array containing all errors that occurred
    var err = v.getErrors();
    for(var i = 0, len = err.length; i < len; i++) {
        console.warn('Error: ' + err[i]);
    }
}

Available validation methods

• min(val)
• max(val)
• exact(val)
• maxLength(val)
• minLength(val)
• exactLength(val)
• required()
• match(val | array) alias for matches(val | array);
• noMatch(val | array),
• isAlpha()
• isNumeric()
• isAlphaNumeric()
• isAlphaDash()
• isInteger()
• isHex()
• isBase64()
• isIP()
• isEmail()
• isUrl()
• noWhitespace()
• isJson()

!important: min(), max() and exact() are for checking integers.
!important: maxLength(), minLength() and exactLength() are for checking character lenght.

All methods are chainable. You can validate as much variable as you like. Call validate() then add the rules that apply for that validation, calling again validate() will add another variable for validation, all the rules applied after the second call of validate() are applied to the second variable. When you added all the variables that needs to be validated just call isValid() this will rerun a boolean value. If you get false you can check what went wrong with getErrors().

validate(value, field_name)

This method prepares a given value for validation. The first parameter value is the parameter to be validated. The second field_name is optional, this is displayed in the error message.

getErrors()

This method returns false if no errors are present or array containing all the errors that occurred during validation.

isValid()

Calling this method ends the validation loop and validates all the added values with their rules attached to them. Validating new values after that starts a new validation loop.

setMsg(msg_name, new_msg)

This method changes the default error message that will be displayed when an error occurred. You can use this to add your own custom error messages.

var new_msg = '{1} value must must be less than {0}';
v.setMsg('maxLength', new_msg);

// old msg: {1} integer value must not exceed {0}
// new msg: {1} value must must be less than {0}

You can change all error messages for each method, just by adding as first parameter it's name and as second the new message. The characters {0} will be replaced with the validation value and {1} with the field_name that you specify in the validate() method as second parameter. For match() and noMatch() there are two different strings depending on the matched value. If you want to change the string for array matching just add Arr to the rule name ex.noMatchArray.

Methods that use both {0} and {1}, all ohter methods use only {1}.

• min(val)
• max(val)
• exact(val)
• maxLength(val)
• minLength(val)
• exactLength(val)
• match(val | array) alias for matches(val | array);
• noMatch(val | array),

Or simply, methods that use both, are methods that have a val parameter.