There are 2 repositories under zxcoder topic.
zmakebas converts a Sinclair BASIC program written as a text file into a Spectrum emulator .TAP file.
Emscripten build for bas2tap which converts BASIC to a TAP tape file.
Emscripten build for Pasmo, a multi-platform Z80 cross-assembler.
Hasura API extension for ZX Basic.
Hasura API extension for Z88DK.