Migrate CouchDB to MongoDB

This tool performs the migration of data from a CouchDB instance to a MongoDB instance. The behaviour of the tool can be changed using environment variables.

Since CouchDB and MongoDB are structured slightly different, the convention is to migrate each CouchDB database to a separate collection within a separate database.

E.g. imagine you have 2 CouchDB databases horses and dogs. The migration tool will create new MongoDB databases for each of them, with a collection with the same name inside. So you end up with:

• Database horses with 1 collection horses
• Database dogs with 1 collection dogs

The migration tool will not migrate _design documents.

Configuration

The tool offers the following configuration passed in via environment variables:

• COUCH - the url to the source database (default: http://localhost:5984)
• MONGO - the URL to the target database (default: mongodb://localhost:27017)
• DB_LIST - optional comma-separated list to limit the databases to copy (default: ALL databases, except system databases)

Execution

• Install dependencies: npm install
• Run the script: npm run start

If you want to pass custom environment variables, set them before the npm command. If you omit them, the defaults will be used and all databases copied:

MONGO=mongodb://my-mongo-host:27017 COUCH=http://target-host:5984 npm run start
# or to limit DBs
DB_LIST=horses,dogs MONGO=mongodb://my-mongo-host:27017 COUCH=http://target-host:5984 npm run start