gistfile1.js

var nano = require('nano')('http://blablabla/');

String.prototype.toUnderscore = function(){
    return this.replace(/([A-Z])/g, function($1){return "_"+$1.toLowerCase();});
};

// For all meetings
nano.db.list(function(err, body) {
    body.forEach(function(db) {
        if (!db.match(/meeting\//)) {
            return;
        }
        console.log('patching db: ' + db);

        var this_db = nano.use(db)
        // For all docs
        this_db.list({include_docs: true}, function(err, body) {
            if (!err) {
                body.rows.forEach(function(doc) {
                    var the_doc = doc.doc;
                    // For all properties
                    for (var property in the_doc) {
                        if (the_doc.hasOwnProperty(property)) {
                            // Do snake charming
                            var snake_charmed = property.toUnderscore();
                            if (snake_charmed !== property) {
                                the_doc[snake_charmed] = the_doc[property];
                                delete the_doc[property];
                            }
                        }
                    }
                    this_db.insert(the_doc, function(err, body) {
                        if (err) console.log(err);
                    });
                });
            }
        });
    });
});