Yet another boilerplate free schema validation library, Connect/Express middleware included.

{validate, any, optional} = require 'schematron'

schema = {
  key: any
  count: Number
  isActive: Boolean
  name: optional(String)
}

data = {
  key: {}
  count: 2
  isActive: false
}

{errors, data} = validate(schema, data)

Or use Connect/Express middleware

{validate} = require 'schematron/middleware'

app.get '/search',
  validate(q: String, limit: optional(Number)),
  (req, res) ->
    // access req.validQuery for validated data