Appsmith Project Structure

The open-source low-code platform for building internal tools. A complex Java/Spring Boot backend combined with a sophisticated React frontend.

Updated 2025-12-30

#appsmith #java #spring-boot #react #low-code #mongodb #monorepo

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Project Directory

appsmith/

app/

Main Application Source

server/

Java Backend

appsmith-server/

Core API Server

appsmith-plugins/

Datasource Plugins

appsmith-interfaces/

Shared Java Interfaces

pom.xml

Maven Config

client/

React Frontend

src/

pages/

Editor & Dashboard

widgets/

UI Widgets

package.json

deploy/

Deployment Scripts (Docker, K8s, Ansible)

Dockerfile

Container definition

Repository Info

Repository-appsmithorg/appsmith
Stars-35k+
License-Apache-2.0 / Commercial
Last Analyzed-December 2025

Tech Stack

Backend-Java (Spring WebFlux)
Frontend-React + Redux Saga
Database-MongoDB
Cache-Redis
Build Tool-Maven / Yarn

Architecture Notes

Appsmith uses a reactive stack on the backend with **Spring WebFlux** and **Reactor**, allowing it to handle high concurrency efficiently. The frontend is a heavy React application that manages a complex state (the widget tree and evaluation graph). The 'Plugin' system allows Appsmith to connect to any datasource (Postgres, Snowflake, REST APIs) in a modular way.

Key Directories

app/server/appsmith-server/-The main API server. Handles user authentication, page rendering logic, and orchestrates actions.
app/server/appsmith-plugins/-Contains individual Maven modules for each integration (e.g., postgres-plugin, restApi-plugin). This isolation prevents dependency conflicts between drivers.
app/client/src/widgets/-The library of UI components (Table, Input, Button) that users drag and drop onto the canvas.

Why This Structure?

Appsmith is a great example of a modern Enterprise Java application. It shows how to use Spring Boot in a non-blocking way (WebFlux) and how to structure a large monorepo that contains both a complex Java backend and a TypeScript frontend.

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