---
title: "REST API SERVER | Introduction | N3uron KB V1.22"
slug: "rest-api-server-introduction"
description: "REST API SERVER is a N3uron module designed to be used for exposing resources. REST calls can be used to retrieve datainformation or send control…"
updated: 2026-01-18T20:19:41Z
published: 2026-01-18T20:19:41Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.n3uron.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

**N3uron ’s**[**REST API Server**](https://n3uron.com/iiot-platform-modules/rest-api-server/)****module is a component of the IIoT & DataOps platform that enables seamless access to the node, facilitating data retrieval and command transmission via REST calls. With this interface, users effortlessly can navigate Data Models programmatically.

The API Server acts as an API gateway for industrial data residing in OT systems by offering a streamlined abstraction layer over diverse protocols—OPC UA, MQTT, Sparkplug, Modbus, DNP3, DLMS, IEC 102, IEC 104, etc.—eliminating the need for domain expertise in underlying systems. Any application or service with an HTTP client can securely request OT data in raw or modeled form directly from N3uron

The main features of **N3uron****’s****REST API Server**are:

- User authentication based on user/password or access token.
- High performance to support unlimited remote clients and connections.
- Secure HTTPS connections.
- Data encryption using self-signed or CA signed certificates.
- Compatible with Automated Certificate Management systems.
- Permits to **read and write** **real-time** values of tags.
- Permits to **retrieve and acknowledge alarms.**
- Permits to retrieve **raw and aggregated****historical data** of several tags in the same request.
- Permits to retrieve and control the status of the system, modules, licenses, links and backups.
- Permits to change the configuration without having to access the WebUI.
- Complete control over the access and permissions of each user.

The REST server uses by default port 3003 for **HTTP** requests and port 3443 for **HTTPS** requests, both ports are configurable.

To create a REST request, a URL is built containing the IP address, service HTTP or HTTPS port, and all other information the server needs in order to complete the desired task. Data is returned in JSON format.

Note:

The [**Appendix**](/v122/docs/rest-api-server-appendix) section contains a Postman collection that will make it much easier for the user to get started with the **REST API Server** module

[![n3uron-chatgpt-assistant](https://cdn.document360.io/54093ab5-6b22-4542-a265-04377931f11a/Images/Documentation/n3uron-chatgpt-assistant.png)](https://chatgpt.com/g/g-693480152e40819182884223d02f3e61-n3uron-rest-api-assistant)

[**N3uron REST API Assistant**](https://chatgpt.com/g/g-693480152e40819182884223d02f3e61-n3uron-rest-api-assistant)

The **N3uron REST API****Assistant** is a specialized **AI tool** **available in the ChatGPT Store**, built to accelerate integration, automation, and configuration tasks using **N3uron’s REST API Server**. It provides production-ready guidance for working with N3uron programmatically.

- Build REST integrations and automations with **N3uron’s REST API** (real-time + historical data, alarms, system, certificates, configuration, backups, and more).
- Get ready-to-use code examples (curl/Postman/Node.js/Python) and request/response patterns.
- Receive configuration guidance.
- Follow best practices for troubleshooting and handling common API errors.

[Embedded content](https://www.youtube.com/embed/sSA3MCQx9GE?&wmode=opaque&rel=0)

[Embedded content](https://www.youtube.com/embed/ElA34mLNRlI?&wmode=opaque&rel=0)