Web Demo: SAS7BDAT Viewer & Converter

Browser-based demo that reads SAS .sas7bdat files entirely client-side using WebAssembly. Upload a file to view metadata, preview data in a sortable table, and export to CSV, NDJSON, Parquet, or Feather.

No build tools, no npm install, no framework — just static files served over HTTP.

Quick start

Copy the WASM binary into this directory (if not already present):
```
cp crates/readstat-wasm/pkg/readstat_wasm.wasm examples/web-demo/
```
If you need to rebuild it first, see the bun-demo README for build instructions.
Serve the directory with any static HTTP server. You must point the server at the directory, not at index.html directly:
```
# From the repo root:
python -m http.server 8000 -d examples/web-demo
npx serve examples/web-demo
bunx serve examples/web-demo

# Or from the web-demo directory:
cd examples/web-demo
python -m http.server 8000
npx serve
bunx serve
```
Note: Do not pass index.html as the argument (e.g., bunx serve index.html). That tells serve to look for a directory named index.html, which will cause the WASM and JS files to 404.
Open http://localhost:3000 (for serve) or http://localhost:8000 (for Python) in your browser.
Upload a .sas7bdat file (e.g., crates/readstat-tests/tests/data/cars.sas7bdat).

Features

Metadata panel — table name, encoding, row/variable count, compression, timestamps
Variable table — name, type, label, and format for each column
Data preview — first 100 rows in a sortable table (uses Tabulator from CDN, with plain HTML table fallback)
Export — download as CSV, NDJSON, Parquet, or Feather

WASM binary

The readstat_wasm.wasm file is built from the readstat-wasm crate (crates/readstat-wasm/). It compiles the ReadStat C library and the Rust readstat parsing library to WebAssembly via the wasm32-unknown-emscripten target. The binary is ~9.7 MB.

A pre-built copy is checked in at crates/readstat-wasm/pkg/readstat_wasm.wasm.

Browser compatibility

Requires a modern browser with WebAssembly support (Chrome 57+, Firefox 52+, Safari 11+, Edge 16+)
Must be served over HTTP(S) — file:// URLs will not work due to WASM fetch() requirements
Tabulator.js is loaded from CDN; if offline, the data preview falls back to a plain HTML table

File structure

examples/web-demo/
├── index.html          # App (HTML + inline CSS + inline JS)
├── readstat_wasm.js    # Browser-compatible WASM wrapper
├── readstat_wasm.wasm  # WASM binary (copied from pkg/)
└── README.md           # This file