#Validator for express js

This provides basic validation middleware, it will help reduce redundancy in the code.

##Available methods

• bodyMustHave
  • Checks if body contains selected params
  • Usage: bodyMustHave('password username')
• queryMustHave
  • Checks if query contains selected params
  • Usage: queryMustHave('password username')
• toInts
  • Attempts to convert selected params in query/body to integers
  • Usage: toInts('skip limit')
• escapeBody
  • Escapes selected params in body
  • Usage: escapeBody('username')
• escapeQuery
  • Escapes selected params in query
  • Usage: escapeQuery('type')
• isIn
  • Checks if a parameter is in array, useful for enums
  • Usage: isIn('body.NY', ['NY', 'LA']) the function will check req.body.NY
  • You can add a message in the third optional parameter, isIn isIn('body.NY', ['NY', 'LA'], 'City is not supported')
• inRange
  • Checks if a parameter is between a given [min, max] values
  • Usage: inRange('query.age', 20, 22) the function will check req.query.age
• objectifyRequestData
  • Gets the properties mentioned in the given params from req.body, req.query, and req.params and dumps them in req.data
  • Usage: objectifyRequestData('username password email location.lat', false) the function will get: username, password, email, and location.lat (safely), from req.body, req.query, req.params, and copy them to req.data.
  • the second field is optional, it defaults to false. If the second parameter was true, all the params must exist, otherwise next(err) will be called.
  • If one of the given params is found in multiple locations of the following: req.body, req.query, req.params, the middleware will call next(err).
  • You can chain call objectifyRequestData, useful if only a portion of your data is required.
• HTTPError
  • Helper for return error responses/messages

##Installation

npm install simple-express-validator

##Usage

var express = require('express');
var app = express();

var bodyParser = require('body-parser');
app.use(bodyParser.json());

var expressValidator = require('express-validator');
app.use(expressValidator());

var bodyMustHave = require('validator').bodyMustHave;

app.post('/', bodyMustHave('username password'), function(req, res, next){
    // code that uses req.body.username and req.body.password
    return res.status(204).end();
});

// error handlers
app.use(function (err, req, res, next) {
    res.status(err.status || 500);
    res.send({
        message: err.message,
        error: {}
    });
});

app.listen(3000);

##Testing

npm test