11 best JavaScript Microservice libraries in 2025

The use of JavaScript microservice libraries single-spa, moleculer, seneca is not only because it is easy to implement and maintain but also provides a high degree of flexibility. You can easily integrate microservice components into your existing application by using the API. For example, if you want to add a new feature in your application, you can use a JavaScript microservice library like moleculer to develop and test it. They help you to build a large scale application with very little effort, and they allow you to use all of the benefits of the JavaScript language. Moleculer is a JavaScript library that provides an easy and intuitive way to build an API. It is designed to be as simple as possible: it doesn't require an extensive configuration or setup process, but at the same time it allows you to build powerful APIs. Seneca is a lightweight microservice framework that simplifies building, deploying and managing apps. Seneca has recently been rewritten from scratch with Ember (and thus ember-cli), so it supports frontend development with Ember.js apps in addition to backend services with Node and Express (and now both). Some of the most widely used open source JavaScript microservice libraries among developers include: