ESC/POS Commands Generator

Javascript ES6 (initially written to be used in react-native)

Getting started

$ npm i escpos-generator

Usage - Generator (API)

Every method (except toArray and the constructor) returns this (default, can be changed by setModality), so it's possible to use the methods both from the generator object and from a method.

constructor

Start a new generation.

setModality(modality)

Sets the return modality of the methods. Default to MODALITY_CLASS

modality (string): look into modality section under getters

init()

Initialize the printer

selectCharacterCodeTable(esc_pos_number, page_table)

Sets the character code table

esc_pos_number (int): look at (https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=32)
page_table (int): look at (https://en.wikipedia.org/wiki/Code_page)

... Work in progress

getters

Modality:
MODALITY_CLASS (return this)
MODALITY_ARRAY (return the array of commands as an array of arrays of bytes)
MODALITY_DIRECT (return directly the command generated as an array of bytes)
Positions:
LEFT
CENTER
RIGHT
Cut paper:
CUT_PAPER_PARTIAL
CUT_PAPER_FULL
Font size:
FONT_NORMAL
FONT_DOUBLE
FONT_TRIPLE

Example

import EscposGenerator from "escpos-generator";

let generator = new EscposGenerator();

generator.init()
    .selectCharacterCodeTable(19, 858)
    .font(EscposGenerator.FONT_NORMAL)
    .align(EscposGenerator.CENTER)
    .bold()
    .text("Mario bros")
    .bold(false)
    .newLine()
    .text("It's-a me, Mario!")
    .newLine()
    .cutPaper(EscposGenerator.CUT_PAPER_FULL, 0x80);

let array = generator.toArray(true);