This module validates incoming headers and adds outgoing headers for JSON API based systems. In additon to basic content negotiation this module supports extension negotiation.
// Without extension support.
app.use(require('jsonapi-headers')());
// OR With extension support.
app.use(require('jsonapi-headers')(['batch', 'jsonpatch']));The resulting middleware will validate Accept and Content-Type headers
as defined by JSON API and will call next with an error if the headers are
invalid (either a 406 or 415 depending on what's wrong).
If there are no validation problems, the Content-Type of the response will
be appropriately assigned, e.g.
application/vnd.api+json; ext=bulk; supported-ext="batch,jsonpatch"
Additionally, any extensions that the request is supporting will be added as
an array to req.ext.