JSON is commonly used as an exchange format between Web client and backend services. Enabling HTML forms to submit JSON directly simplifies implementation as it enables backend services to operate by accepting a single input format that is what’s more able to encode richer structure than other form encodings (where structure has traditional had to be emulated).
User agents that implement this specification will transmit JSON data from their forms whenever the form’s
enctype attribute is set to
application/json. During the transition period, user agents that do not support this encoding will fall back to using
application/x-www-form-urlencoded. This can be detected on the server side, and the conversion algorithm described in this specification can be used to convert such data to JSON. Continue reading