Node-RED — A free, open-source, low-code visual programming tool for wiring together hardware devices, APIs, and online services into event-driven flows, maintained by the OpenJS Foundation.
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Node-RED in 20 seconds
Best for: hobbyists and engineers who need a free, visual way to wire together IoT devices, APIs, and data pipelines
Pricing: Free and open source under Apache 2.0; third-party hosted/managed versions (e.g. FlowFuse) are sold separately.
- Node-RED is free and open source under the Apache 2.0 license, maintained by the OpenJS Foundation.
- Node-RED has an ecosystem of over 5,000 community-built nodes and flows published on npm.
- Node-RED deploys to Docker, Raspberry Pi, BeagleBone Black, Arduino, Android, and cloud platforms like AWS and Azure.
- Node-RED's GitHub repository has roughly 23.6k stars.
- Node-RED holds a 5.0/5 rating from 1 review on Product Hunt.
Limitations: Large flows become hard to read, review, and version-control at scale.; No built-in first-class testing or CI framework for flows.; Self-hosting security and updates are left to the user unless using a managed provider.
Top alternatives: n8n, Zapier, Make, Apache NiFi — full list
What is Node-RED?
Node-RED is a low-code, browser-based visual programming tool for event-driven applications: users drag nodes onto a flow canvas and wire them together to collect, transform, route, and visualize data without writing full applications by hand. Built on Node.js, it is used across a wide range of scales, from home-automation hobbyists connecting smart-home devices to industrial teams building control systems and edge-computing pipelines on resource-constrained hardware. The project is free and open source under the Apache 2.0 license and is maintained by the OpenJS Foundation, the same foundation behind Node.js and jQuery. Its extensibility comes from an ecosystem of more than 5,000 community-contributed nodes and flows published on npm, covering integrations from MQTT and REST APIs to specific hardware platforms like Raspberry Pi, BeagleBone Black, and Arduino. Node-RED itself has no paid tier or licensing cost; commercial hosting and management (for example, from FlowFuse) is offered by third parties, not the core project.
Node-RED is a browser-based, low-code flow editor for building event-driven applications by wiring together nodes that collect, transform, and visualize real-time data. It is built for hobbyists doing home automation as well as engineers building industrial control and edge-computing systems, and it is free and open source under the Apache 2.0 license with no paid tier from the project itself. Node-RED runs on Node.js and deploys to Docker, Raspberry Pi, BeagleBone Black, Arduino, and Android devices, or to cloud platforms like AWS and Azure, and it is maintained by the OpenJS Foundation with an ecosystem of over 5,000 community-built nodes. Third-party vendors such as FlowFuse sell hosted and managed versions, but the core project itself has no license cost.
Standout feature: A drag-and-drop flow editor backed by an ecosystem of over 5,000 community-built nodes, covering integrations from MQTT and REST APIs to specific hardware like Raspberry Pi and Arduino.
Biggest weakness: Flows can become difficult to read, version, and debug at scale since Node-RED has no built-in first-class testing framework, and complex logic buried inside function nodes effectively becomes untracked JavaScript that's hard to review.
Pros
- Free and open source under Apache 2.0, maintained by the OpenJS Foundation with no licensing cost.
- Visual flow editor lowers the barrier to building event-driven integrations compared to writing full application code.
- Runs on everything from a Raspberry Pi to cloud platforms like AWS and Azure.
- Ecosystem of over 5,000 community-built nodes covers most common hardware and API integrations out of the box.
Cons
- Large flows become hard to read, review, and version-control compared to conventional code.
- No built-in first-class testing or CI framework for flows, making regression testing manual.
- Function nodes let users embed raw JavaScript, which can undermine the low-code readability the tool is chosen for.
- Self-hosting and securing a Node-RED instance (auth, HTTPS, updates) is left to the user unless a managed provider like FlowFuse is used.
Node-RED pricing
Free · verified from the vendor's pricing page
| Plan | Price | Notes |
|---|---|---|
| Open source | Free | Free and open source under Apache 2.0; self-host on your own hardware, Docker container, or cloud VM. |
What reviewers say
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