Playgrounds

Every playground runs the real engine in your browser — the published zipnative package from a CDN pinned to this site's version, with a committed local copy of dist/index.js as fallback (each page's footer shows which source loaded). What you see is exactly what the library does.

The synchronous APIs on these pages run the pure-TS tier (initNodeZipCodecs() is a Node-only optimisation and is never called here); the forward-streaming page's async iteration may additionally use the browser's own DecompressionStream.

Archive toolkit

Build an archive from entries you type, toggle deterministic mode, and see its size, entry table and SHA-256 — then download it.

createZipopenZipdeterministic

Open toolkit →

Archive inspector

Drop any .zip (DOCX, JAR, VSIX, EPUB…) and read its central directory — names, methods, sizes, CRCs, flags — without extracting a byte.

openZipentries()random access

Open inspector →

Secure extraction

Watch the default guards reject a zip-slip archive and a corrupt one with typed err.codes — then drop your own and see what passes.

extractZiperr.codezip-slip

Open demo →

Incremental modify

Edit an archive without recompressing a single entry — compare the append-only save() against saveCompact(), byte for byte, and watch the dead-bytes diagnostic fire.

createZipModifiersaveCompactdiagnostics

Open modifier →

Forward streaming

Read a ZIP you cannot seek: forward iteration off a chunked ReadableStream, the resumable inflater's live byte counters, and the trust caveat versus openZip.

iterateZipEntriescreateInflatorReadableStream

Open streaming →