express-requires

An express middleware for validating request fields and query parameters and returns a nicely formatted informative response. Performs two simple use cases:

• Prevent unexpected parameters from being accepted
• Requiring parameters to be passed to continue
• Or both chained together

Setup

npm install express-requires --save

Can be used on your whole app or just a single router

var requires = require('express-requires')
app.use(requires());
// or

var router = express.Router();
router.use(requires());

//How to use
router.post('/person/new', function(req, res) {
  var fields = ['firstName', 'lastName'];
  if (req.requires(fields).allows(fields).check()){
    //..Continue if returns true. If not do nothing because a response is formatted and returned.
  }
})

A bad request would return error code400

{
  "message": "Unexpected field: sample"
}

{
  "message": "Missing required field: firstName"
}

Can change the order to make a certain error condition take precedence.

req.requires(fields).check()
req.allows(fields).check()
req.requires(fields).allows(fields).check()
req.allows(fields).require(fields).chec()

Validating Lists

The above validations can also be done on a list object.

router.post('/person/bluk-create', function(req, res) {
    var fields = ['firstName', 'lastName'];
    if (req.list().requires(fields).allows(fields).check()){
        //...
    }
})

Example Request

{
  "firstName": "test",
  "lastName": "test2"
}

Response

{
  "message": "Expected JSON array body"
}

Example 2

[
  {
    "firstName": "test",
    "lastName": "test2"
  },
  {
    "firstName": "test3"
  }
]

Response

{
  "message": "Missing required field: lastName at item 1"
}

Extra Options

Can optionally add the code and success flag to the response body in event of an error.

app.use(requires({
  includeCode: 'code',
  includeSuccess: 'success'
}));

Returns

{
  "message": "Missing required field: lastName",
  "code": 400,
  "success": false
}

Run Tests

The tests use a mock express server with the middleware in place and a series of mocha chai tests

npm test
npm cover