express-request-checker

Create request checker middleware for Express.

with express-request-checker, checking HTTP request's query， body or url params will be more easy and readable. All the works is just require express-request-checker in router.js which belongs to an Express project and config it. So it's no need to modify any other source file.

Since validation codes are written in a config-like way, router.js file will look like an API document, I hope that the communication cost within the development team can be reduced.

• No validation codes.
• router.js is also an API document.
• Easy to combine with other validation package.

Quick Example(Javascript):

// router.js
 
var express          = require('express');
var reqCheckerModule = require('express-request-checker');
 
var reqChecker = reqCheckerModule.requestChecker;
var router = express.Router();
 
var options = {
  strict: false,  // Allow unexpected parameter. (true|false, DEFAULT: true)
  query: {        // Check req.query. (params|query|body)
    'param1': {
      matchRegExp: /^[0-9]{1}$/
    },
    'param2': {
      isIn: [1, 2, 3],
      isOptional: true    // Optional parameter. (true|false, DEFAULT: false)
    }
  }
};
router.get('/path', reqChecker(options), handlerFunction);
 
module.exports = router;

Quick Example(CoffeeScript):

# router.coffee 
 
express          = require 'express'
reqCheckerModule = require 'express-request-checker'
 
reqChecker = reqCheckerModule.requestChecker
router = express.Router()
 
options =
  strict: false  # Allow unexpected parameter. (true|false, DEFAULT: true) 
  query:         # Check req.query. (params|query|body) 
    'param1':
      matchRegExp: /^[0-9]{1}$/
    'param2':
      isIn: [1, 2, 3]
      isOptional: true    # Optional parameter. (true|false, DEFAULT: false) 
router.get '/path', reqChecker(options), handlerFunction
 
module.exports = router

Play with other modules

// router.js
 
var express          = require('express');
var reqCheckerModule = require('express-request-checker');
 
var reqChecker = reqCheckerModule.requestChecker;
var router = express.Router();
 
var validator = require('validator');
var options = {
  params: {
    'id': {
      assertTrue: validator.isInt
    }
  },
  body: {
    'email': {
      assertTrue: validator.isEmail
    },
    'jsonData': {
      assertTrue: validator.isJSON
    }
  }
};
router.post('/user/:id', reqChecker(options), handlerFunction);
 
module.exports = router;

Checker Options Default Values

Parameter Options Default Values

Parameter Options

assertTrue

function, [function, function ...] or []. (DEFAULT: [] - No checker)
Using parameter in request as function(s)'s argument, if the function(s) return true,OK. Otherwise, NG.

Example:

option = {
  query: {
    param1: {
      assertTrue: [function(value) { return value > 10; }]
    }
  }
}

assertFalse

Opposite to assertTrue.

matchRegExp

RegExp, [RegExp, RegExp ...] or []. (DEFAULT: [] - Don't check)
If the RegExp(s) test result is true, OK. Otherwise, NG.

Example:

option = {
  query: {
    param1: {
      matchRegExp: [/^[012]{1}$/, /^[234]{1}$/]
    }
  }
}

isIn

[value, value, ...] or []. (DEFAULT: [] - Don't check)
Values of parameter in request which are allowed.

Example:

option = {
  query: {
    param1: {
      isIn: [1, 2, 3]
    }
  }
}

notIn

Opposite to isIn.

isInteger

true or false. (DEFALT:null - Don't care)
when true, The value of parameter in request must be an integer.
when false, The value of parameter in request must NOT be an integer.

Example:

option = {
  query: {
    param1: {
      isInteger: true
    }
  }
}

isEmail

true or false. (DEFALT:null - Don't care)
when true, The value of parameter in request must be an correct email address.
when false, The value of parameter in request must NOT be an email address.

Example:

option = {
  query: {
    param1: {
      isEmail: true
    }
  }
}

isArray

true or false. (DEFALT:null - Don't care)
when true, The value of parameter in request must be an Array or stringified Array.
when false, The value of parameter in request must NOT be an Array or stringified Array.

Example:

option = {
  query: {
    param1: {
      isArray: true
    }
  }
}

isIntegerArray

true or false. (DEFALT:null - Don't care)
when true, The value of parameter in request must be an Array or stringified Array whose elements are all integers.
when false, The value of parameter in request must NOT be an Array or stringified Array whose elements are all integers.

Example:

option = {
  query: {
    param1: {
      isIntegerArray: true
    }
  }
}

equal / greaterThan / greaterEqual / lessThan / lessEqual

integer or null. (DEFALT:null - Don't care)
The value of parameter in request must be equal/greaterThan/greaterEqual/lessThan/lessEqual to the option value.

Example:

option = {
  query: {
    param1: {
      equal: 100
    }
  }
}

allowEmpty

true or false. (DEFAULT: false)
when setted true, The value of parameter in request can be ''.
when setted true, The value of parameter in request can NOT be ''.

Example:

option = {
  query: {
    param1: {
      isEmpty: false
    }
  }
}

maxLength / minLength

integer or null. (DEFALT:null - Don't care)
Max/Min Length of the value of parameter in request.

Example:

option = {
  query: {
    param1: {
      minLength: 5,
      maxLength: 10
    }
  }
}

Install:

npm install express-request-checker

Test:

cd node_modules/express-request-checker
npm test

License

MIT