Proj4js

Using high-precision grid adjustments requires managing external files (e.g., NTv2 .gsb or GeoTIFF .tif) and additional libraries like GeoTIFF.js, adding setup overhead and potential dependency issues.

Conversions can introduce floating-point errors, as noted in the README example where inverse projection yields 40.99999999999986 instead of 41, which may affect accuracy-sensitive applications.

Requires understanding of PROJ strings, WKT, and coordinate system concepts, with limited beginner-friendly documentation, making it challenging for developers new to geospatial data.

JavaScript-based transformations may be slower for intensive computations compared to native C/C++ libraries, especially when handling large datasets or complex grid-based adjustments.