8. Query Server

The Query server is an external process that communicates with CouchDB by JSON protocol through stdio interface and processed all design functions calls: views, shows, lists and more.

The default query server is written in JavaScript, running via Mozilla SpiderMonkey. You can use other languages by setting a Query server key in the language property of a design document or the Content-Type header of a temporary view. Design documents that do not specify a language property are assumed to be of type javascript, as are ad hoc queries that are POSTed to _temp_view without a Content-Type header.

• 8.1. Query Server Protocol
  • 8.1.1. reset
  • 8.1.2. add_lib
  • 8.1.3. map_doc
  • 8.1.4. reduce
  • 8.1.5. rereduce
  • 8.1.6. ddoc
  • 8.1.7. Raising errors
  • 8.1.8. Logging
• 8.2. JavaScript
  • 8.2.1. Design functions context
  • 8.2.2. CommonJS Modules
• 8.3. Erlang