koa-validator

koa-validator

a koa port of express-validator

Install

npm install koa-validator

Usage

var koa = require('koa')
    , validator = require('koa-validator')
    , bodyParser = require('koa-bodyparser')
    , app = koa()
    ;

app
    .use(bodyParser())
    .use(validator({
        onValidationError: function(errMsg){
            console.log('Validation error:', errMsg);
        }
    }))
    .use(functon *(next){
        this.checkParams('testparam', 'Invalid number').isInt();
        yield next;
    })
    .listen(3000)
    ;

Options

• onValidationError - function(errMsg), default to null. The errMsg is the errMsg you defined when you check one variable

  You can define the function like this

    function(errMsg){
        throw new Error('Validation error: ' + errMsg);
    }
  

• validationErrorFormatter - function(paramName, errMsg, value), the default function is below

    function(paramName, errMsg, value){
        return {
            param: paramName
            , msg: errMsg
            , value: value
        };
    }
  

Note

If you will use checkBody or assertBody or sanitizeBody, you should use one bodyparse middleware before validator.

Test

npm test

API

• checkParams
• checkQuery
• checkBody
• checkHeader
• sanitizeParams
• sanitizeQuery
• sanitizeBody
• assertParams => checkParams
• assertQuery => checkQuery
• assertBody => checkBody
• assertHeader => checkHeader
• haveValidationError, return true if have any validationError
• validationErrors, if have any validationError, return an array of error object you returned in validationErrorFormatter

Check

You can use all check methods in validator.js checks.

In addition, you can use below methods extended to validator.js.

• notEmpty
• empty
• eq, use ==
• eqeq, use ===
• neq, use !=
• neqeq, use !==
• gt
• lt
• ge
• le
• notContains
• isTime
• len, an alias to validator.js' isLength
• in, an alias to validator.js' isIn
• byteLength, a function support set charset.
• isUrl, an alias to validator.js' isURL
• isIp, an alias to validator.js' isIP
• isLowerCase, an alias to validator.js' isLowercase
• isUpperCase, an alias to validator.js' isUppercase

Sanitize

You can use all sanitize methods in validator.js.

In addition, you can use below methods extended to validator.js.

• default, set default value
• toLowerCase
• toUpperCase
• encodeURI
• encodeURIComponent
• decodeURI
• decodeURIComponent
• replace
• toLow, an alias to toLowerCase
• toUp, an alias to toUpperCase

Extend

If you want to extend validator.js, you can use extendCheck and extendSanitize like below examples.

When you extend validator.js, your check function name best match is*, and your sanitize function name best match to*. This is not force, but recommended. If you extend one function that validator.js have already had, the function will be ignored, and an error will be thrown.

var koa = require('koa')
    , bodyParser = require('koa-bodyparser')
    , validator = require('koa-validator')
    ;

validator.extendCheck('isFinite', function(str){
    return isFinite(str);
});
validator.extendCheck({
    isFinite: function(str){
        return isFinite(str);
    }
    , isFinite2: function(str){
        return isFinite(str);
    }
});

validator.extendSanitize('toZero', function(str){
    return 0;
});
validator.extendSanitize({
    toOne: function(str){
        return 1;
    }
    , toTwo: function(str){
        return 2;
    }
});

koa()
.use(bodyParser())
.use(validator())
.use(function *(next){
    this.checkParams('test', 'Invalid test value').isFinite();
    yield next;
})
.listen(3000)
;

Thanks

Thanks to koa-validate, some extended methods and test suites are based on koa-validate.

LICENSE

MIT