Run this to install Nesu as a global package:

$ npm install -g @rappopo/nesu

Go to your project folder, and invoke:

$ nesu

The first time Nesu starts, it’ll create an empty config.json configuration file, transformer and last_seq folder in your project folder. Quit Nesu by pressing Ctrl-c and start customizing its configurations (please see details below).

As Library

Go to your node.js application project folder, and type:

$ npm install --save @rappopo/nesu

Create an empty new js file, e.g.: nesu.js, and enter the following code:

var nesu = require('@rappopo/nesu')

Also create the config.json configuration file in the same folder as nesu.js file above like this example below:

"db": {
"mydb1": {
"idleTimeout": 0
"mydb2": {
"cdb": {
"url": "http://couchdb:5984",
"name": "mycouchdb1"
"es": {
"url": "http://elasticsearch:9200",
"name": "myesindex1"
"bulkLimit": 500,
"idleTimeout": 10
"default": {
"bulkLimit": 5000

And finaly:

$ node nesu.js

But most likely you’ll want to use a process manager like pm2.

Program will automatically create an empty config.js file if missing. Two empty folders transformer and last_seq will also be created.

You might also want to change the configuration object above dynamically within your script, like this:

nesu({ config: <config> })

The value of <config> will simply be merged with the above configuration file.