my-validator

my-validator v0.1.0

my-validator is my simple validator for me.

It provides functions to validate string. It also works with express.

Installation

npm install my-validator

Usage

Just use validator functions:

var validator=require('my-validator');

var funcs=validator.funcs;

// returns null if valid
console.log(funcs.isInteger("123"));	// null

// returns error object if not valid
console.log(funcs.isInteger("foo"));
/* returns {
       name: "ValidationError",
       code: "ERR_FORMAT_INTEGER",
       value: "foo"
   } */


Use with express:

```js
var express=require('express'),
    validator=require('my-validator');

var app=express();

app.use(validator.forExpress);	//register validator middleware

app.get("/",function(req,res){
    //validate query/body/params
    req.validateQuery("foo").length(100);	//limit length to 100

    // throw if validation error: handle it in error-handling middleware
    req.throwValidationErrors();

    // or handle errors manually
    if(req._validationErrors.length>0){
        res.json({
            validationErrors: req._validationErrors
        });
        return;
    }
    res.send("ok");
});

validators

All of these functions return null if valid or error object if not valid.

matches(value:string, pattern:RegExp)

Checks if value matches pattern.

Possible error code is error.code.pattern.unmatch.

isnotEmpty(value:string)

Checks if value !== "".

Possible error code is error.code.empty.

length(value:string[, min:number], max:number)

Checks if the length of value is within the range specified.

Possible error code is error.code.length.min if value.length < min and error.code.length.max if max < value.length.

minLength(value:string, min:number)

Just checks lower bound of the length.

Possible error code is error.code.length.min.

lines(value: string, max:number)

Checks if the number of lines that value contains does not exceed max.

Possible error code is error.code.lines.max.

isASCIIPrintable(value:string)

Checks if all the characters of value is ASCII printable character (0x20 <= code <= 0x7E).

Possible error code is error.code.character.asciiPrintable.

isHiragana(value:string[, allowSpace: boolean])

Checks if all the characters of value is ひらがな for me. If allowSpace is true, it also allows U+3000 IDEOGRAPHIC SPACE. Defaults to false.

Possible error code is error.code.character.hiragana.

isKatakana(value:string[, allowSpace: boolean])

Checks if all the characters of value is カタカナ for me.

Possible error code is error.code.character.katakana.

isNumber(value:string[, allowNegatives: boolean])

Checks if value is a valid expression of number. If allowNegatives is true, it allows negative numbers (defaults to false).

Possible error code is error.code.format.number.

isInteger(value:string[, allowNegatives: boolean])

Checks if value is a valid expression of integer If allowNegatives is true, it allows negative numbers (defaults to false).

Possible error code is error.code.format.integer.

isEmail(value:string)

Checks if value is a valid expression of email address.

Possible error code is error.code.format.email.

Error objects (error = validator.error)

error.ValidationError

The Error object returned by validator functions. It has following properties:

• name:string the name of error.
• code:string the error code that represents the cause of error.
• value:string the value that is validated.

APIs for express

validator.forExpress

Middleware function for express application.

req.validateQuery(name:string)

Returns a validator object for req.query[name]. The validator object is equipped with any validator function, of which first argument (value) is omitted, and chainable.

req.validateBody(name:string)

Returns a validator object for req.body[name].

req.validateParams(name:string)

Returns a validator object for req.params[name].

req._validationErrors

Array of all validation errors detected by validator objects.

req.throwValidationErrors()

Throws if there is any validation error. Otherwise do nothing.

Other APIs

validator.addCustomValidator(name:string[, code:string], func:Function)

Adds new validator represented by func. func should return true if valid or false if invalid.

The custom validator can be used in the same way as build-in validators.

License

MIT