rvagg/through2

Health v2 · maintenance only

Adoption not part of the score

1907 stars · 105 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A tiny Node.js library that wraps stream Transform logic in simple functions, avoiding explicit subclassing of stream.Transform. It supports both Node-style streams and Web Streams pipelines with callback, async function, and async generator transform styles.

Use cases

• transform data chunks in a node.js stream pipeline without writing a Transform subclass
• map filter or batch items flowing through a stream
• insert async transformation logic into a web streams pipeThrough pipeline
• parse newline-delimited input line by line from a readable stream
• build object-mode transform streams with minimal boilerplate

When to choose

• you need to add transformation steps to Node.js or Web Streams pipelines with minimal code
• you want to avoid subclassing stream.Transform and handling backpressure manually
• you prefer a tiny dependency with a simple function-based API
• you need async/await or async generator support in stream transforms

When to avoid

• you need complex multi-stage stream orchestration beyond simple transforms
• you are not working with streams at all
• you require CommonJS on Node versions older than 22.12 without pinning to v4

Facets

library · maturity stable

streaming concurrency developer-tools developer-tools backend node-streams web-streams transform-stream stream-pipeline esm data-engineering nodejs javascript

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