duplexify
Turns writeable and readable streams into a single duplex stream.
Pricing
Free tier
Flat rate
Adoption
↘CoolingLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is duplexify?
Duplexify is a Node.js library that allows developers to combine two separate streams, one writable and the other readable, into a single duplex stream. This simplifies handling of complex data flows in applications using Node.js streams.
Key differentiator
“Duplexify stands out as a lightweight and efficient solution for combining writable and readable streams into a single duplex stream, offering simplicity in managing complex data flows within Node.js applications.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
The official documentation lacks detailed usage scenarios and practical examples for complex stream operations.
Duplexify is specifically tailored to work with Node.js streams, limiting its application in broader contexts or with other data handling libraries.
The project has a relatively small contributor base which can lead to slower response times for bug fixes and feature requests.
Fit analysis
Who is it for?
✓ Best for
Node.js developers who need to manage complex data flows involving both input and output streams.
Projects requiring the integration of multiple streaming components into a single, unified interface.
✕ Not a fit for
Developers working with non-Node.js environments where stream handling is not required.
Applications that do not involve complex data flow management or require simpler stream operations.
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Integrations
Next step
Get Started with duplexify
Step-by-step setup guide with code examples and common gotchas.