The default location of the couch.ini file is in /usr/local/etc/couchdb. It is the local configuration file for the couch server.

The default configuration file is shown, with each option described in detail.

; etc/couchdb/couch.ini.tpl.  Generated from couch.ini.tpl.in by configure.
[Couch]
ConsoleStartupMsg=Apache CouchDB is starting.
DbRootDir=/usr/local/var/lib/couchdb
Port=5984
BindAddress=192.168.109.162
DocumentRoot=/usr/local/share/couchdb/www
LogFile=/usr/local/var/log/couchdb/couch.log
UtilDriverDir=/usr/local/lib/couchdb/erlang/lib/couch-0.8.0-incubating/priv/lib
LogLevel=info
[Couch Query Servers]
javascript=/usr/local/bin/couchjs /usr/local/share/couchdb/server/main.js

Couch section

Couch Query Servers section