http://bit.ly/OHNWiW

gistfile1.js

db.getSiblingDB("admin");

var databases = null;

databases = db.runCommand("listDatabases");

if(databases){

    for(var i=0;i<databases.databases.length;i++){
        //TODO skip if it's the admin database
        var dbname = databases.databases[i].name;
        var the_db = db.getSiblingDB(dbname)
        databases.databases[i].stats = the_db.stats();
        databases.databases[i].collections = {}
        var collections = the_db.getCollectionNames();
        for(var j=0;j<collections.length;j++){
            var collectionname = collections[j]
            var collectioninfo = {}
            var collection = the_db.getCollection(collectionname);
            collectioninfo['stats'] = collection.stats()
            collectioninfo['indexes'] = collection.getIndexes()
            databases.databases[i].collections[collectionname] = collectioninfo
        }
    }
}


printjson(databases)