Kotlin/kotlinx-io

Health v2 · maintenance only

Adoption not part of the score

1545 stars · 82 forks observed · 2026-08-28

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

kotlinx-io is a Kotlin multiplatform library providing basic I/O primitives such as Buffer, Source, Sink, and ByteString, inspired by Okio. It also offers experimental filesystem support with a multiplatform FileSystem and Path API.

Use cases

• read and write bytes across JVM, native, and JS targets with one API
• efficiently buffer and copy byte data without extra allocations
• perform file and directory operations in Kotlin multiplatform code
• migrate or interoperate with Okio-based code via the bridge module
• build multiplatform network or serialization libraries on top of Source/Sink abstractions

When to choose

• you need consistent I/O primitives across all Kotlin multiplatform targets
• you want segment-based buffers with cheap copies and minimal allocations
• you are building a Kotlin multiplatform library that needs file or byte-stream access

When to avoid

• you need a fully stable, guaranteed-non-breaking API (the library is Alpha)
• you already use Okio and do not need multiplatform coverage
• you need advanced filesystem features beyond basic operations

Facets

library · maturity experimental

file-system serialization developer-tools developer-tools cross-platform files cross-platform jvm windows wasm kotlin-multiplatform buffer okio-inspired byte-manipulation jetbrains android ios macos linux

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