dwg2geo (npm)

Convert engineering DWG drawings to GeoJSON entirely in the browser or Node — the pure-Rust dwg2geo converter compiled to WebAssembly. No native dependencies, no server.

npm install dwg2geo

Browser (or any runtime where fetch resolves module-relative URLs):

import init, { convert } from 'dwg2geo';

await init(); // fetches and instantiates the wasm module

const bytes = new Uint8Array(await file.arrayBuffer()); // a .dwg file
const result = convert(bytes, /* polygonize_closed */ false, /* curve_tolerance */ undefined);

const fc = JSON.parse(result.geojson); // GeoJSON FeatureCollection (local drawing coordinates)
console.log(result.feature_count, result.converted, result.skipped, result.warnings);

Node (no fetch for file: URLs — pass the wasm bytes explicitly):

import { readFile } from 'node:fs/promises';
import init, { convert } from 'dwg2geo';

const wasm = await readFile(new URL('./node_modules/dwg2geo/dwg2geo_wasm_bg.wasm', import.meta.url));
await init({ module_or_path: wasm });

const result = convert(new Uint8Array(await readFile('drawing.dwg')), false, undefined);

The result mirrors dwg2geo's EmbedResult:

| field | meaning | |---|---| | geojson | FeatureCollection string in the drawing's local coordinates | | feature_count, model_space_entities | totals | | converted / skipped / failed | per-entity-type outcome counts with reasons | | warnings | conversion warnings | | bbox | [minx, miny, maxx, maxy] or null | | source_sha256 | hash of the input bytes (audit trail) |

Features carry resolved CAD style metadata (layer, color_rgb, color_index, linetype, lineweight_mm, text properties…). Coordinates are local — georeference them yourself (e.g. proj4js) with the drawing's known CRS; dwg2geo never guesses one.

Deterministic: the same bytes always produce byte-identical GeoJSON on a given platform (across platforms — native vs WebAssembly — a few floating-point values may differ in the last digit).

Built with wasm-pack --target web. See a full working app at dwg2geo-app (live demo).

License: MIT.