req-requires.js makes it easy to make sure the properties in your expressjs request are valid.

Installation

Install req-requires with npm install req-requires

Usage

Setup

The following needs to be placed in the app.js file

var requires = require('req-requires');
//load the middleware
app.use(requires.setup);

//IMPORTANT: app.router must be called before requires.error
app.use(app.router);
app.use(requires.error);

Basic Example

This will make sure the /testRoute handler has req.query.name

app.get('/testRoute', function(req, res){
  req.requires.property('query.name').toExist();

  res.send('Hello '+req.query.name+'!');
});

Example of a failing request

Example Request:
GET: http://localhost:3000/testRoute

Example Response
400: Expected query.name to exist

Example of a passing request

Example Request:
GET: http://localhost:3000/testRoute?name=brandon

Example Response
200: Hello brandon!

More Examples

• Requiring a single property
• Requiring properties set from other handlers
• Chaining requirements
• Returning a custom error when a parameter requirement fails

Validators

toExist - the given property must exist in the request object
toBeType - the property must match the given type
toMatch - the property matches the given regex
toBeIn - the property is a member of the given array