keyjockey

Reads guitar tablature and gives you notes: eight tunings, capo offsets, MIDI numbers and frequencies. The same reader Key-J runs in the browser, as a package.

Install from npm See it running in Key-J

npm install keyjockey · MIT · 8 tunings · also on PyPI as keyj

What it does

Reads guitar tablature and converts notes. Eight tunings, capo offsets, MIDI and frequency.

npm install keyjockey
keyjockey.parseTab(tab, "Standard (EADGBe)", 0).notes;
keyjockey.parseTab(tab, "Drop D", 2).notes;      // capo 2
keyjockey.midiToName(60);                        // "C4"
keyjockey.nameToFreq("A4");                      // 440

Lifted, not rewritten

This is the same reader Key-J runs in the browser, and the Python half is on PyPI as keyj. The npm package is generated from app.html at build time rather than written a third time, and the build fails if the app moves and the package does not.

Key-J has already shipped three defects that existed only because two copies of one thing drifted. A third copy would have been a third chance.

Errors come back, they are not thrown

A tab in a tuning that does not exist returns .error and no notes. Text that is not tablature returns zero notes rather than guessing at one.

npm Key-J

How it works

Install itnpm install keyjockey.
Give it a tab and a tuningparseTab(tab, "Drop D", 2). Tuning by name, capo as an offset.
Take the notesNote names, MIDI numbers or frequencies, whichever your program needs.

What it does

Eight tuningsWith capo offsets applied as a shift rather than a separate table to maintain.

MIDI and frequencymidiToName(60) and nameToFreq("A4") for the conversions everything else needs.

Lifted, not rewrittenGenerated from the code Key-J actually runs, and the build fails if the app moves and the package does not.

Errors come back, not thrownAn unknown tuning returns .error and no notes. Text that is not tablature returns zero notes rather than guessing at one.

Two registries, one sourcekeyjockey on npm, keyj on PyPI.

Why it existsKey-J shipped three defects that existed only because two copies of one thing drifted. A third copy would have been a third chance.

Specifications

Install	npm install keyjockey
License	MIT
Tunings	8, with capo offsets
Source	vince-gonzalez/f-keys

Questions

Is this the same as the keyj package?: Same reader, different registry. npm gets keyjockey, PyPI gets keyj.
Does it play audio?: No. It converts tablature to notes; what you do with them is yours.
What happens with a malformed tab?: Zero notes rather than invented ones.