rn-thermal-printer
Advanced tools
Print on Epson, Star, Tranca, Daruma and Brother thermal printers with Node.js
Node.js module for Epson, Star, Tanca, Daruma, and Brother thermal printers command line printing.
npm install node-thermal-printer
Linux requires build-essentials
sudo apt-get install build-essential
When using inside a browser, the network interface will not work as browsers do not allow opening TCP sockets.
You still need to instruct the compiler to ignore node dependencies. For webpack, it can be done like this:
new webpack.IgnorePlugin({
resourceRegExp: /^fs$|^net$/,
}),
const { ThermalPrinter, PrinterTypes, CharacterSet, BreakLine } = require('node-thermal-printer');
let printer = new ThermalPrinter({
type: PrinterTypes.STAR, // Printer type: 'star' or 'epson'
interface: 'tcp://xxx.xxx.xxx.xxx', // Printer interface
characterSet: CharacterSet.PC852_LATIN2, // Printer character set
removeSpecialCharacters: false, // Removes special characters - default: false
lineCharacter: "=", // Set character for lines - default: "-"
breakLine: BreakLine.WORD, // Break line after WORD or CHARACTERS. Disabled with NONE - default: WORD
options:{ // Additional options
timeout: 5000 // Connection timeout (ms) [applicable only for network printers] - default: 3000
}
});
let isConnected = await printer.isPrinterConnected(); // Check if printer is connected, return bool of status
let execute = await printer.execute(); // Executes all the commands. Returns success or throws error
let raw = await printer.raw(Buffer.from("Hello world")); // Print instantly. Returns success or throws error
printer.print("Hello World"); // Append text
printer.println("Hello World"); // Append text with new line
printer.openCashDrawer(); // Kick the cash drawer
printer.cut(); // Cuts the paper (if printer only supports one mode use this)
printer.partialCut(); // Cuts the paper leaving a small bridge in middle (if printer supports multiple cut modes)
printer.beep(); // Sound internal beeper/buzzer (if available)
printer.upsideDown(true); // Content is printed upside down (rotated 180 degrees)
printer.setCharacterSet(CharacterSet.PC852_LATIN2); // Set character set - default set on init
printer.setPrinterDriver(Object) // Set printer drive - default set on init
printer.bold(true); // Set text bold
printer.invert(true); // Background/text color inversion
printer.underline(true); // Underline text (1 dot thickness)
printer.underlineThick(true); // Underline text with thick line (2 dot thickness)
printer.drawLine(); // Draws a line
printer.newLine(); // Inserts break line
printer.alignCenter(); // Align text to center
printer.alignLeft(); // Align text to left
printer.alignRight(); // Align text to right
printer.setTypeFontA(); // Set font type to A (default)
printer.setTypeFontB(); // Set font type to B
printer.setTextNormal(); // Set text to normal
printer.setTextDoubleHeight(); // Set text to double height
printer.setTextDoubleWidth(); // Set text to double width
printer.setTextQuadArea(); // Set text to quad area
printer.setTextSize(7,7); // Set text height (0-7) and width (0-7)
printer.leftRight("Left", "Right"); // Prints text left and right
printer.table(["One", "Two", "Three"]); // Prints table equally
printer.tableCustom([ // Prints table with custom settings (text, align, width, cols, bold)
{ text:"Left", align:"LEFT", width:0.5 },
{ text:"Center", align:"CENTER", width:0.25, bold:true },
{ text:"Right", align:"RIGHT", cols:8 }
]);
printer.code128("Code128"); // Print code128 bar code
printer.printQR("QR CODE"); // Print QR code
await printer.printImage('./assets/olaii-logo-black.png'); // Print PNG image
printer.clear(); // Clears printText value
printer.getText(); // Returns printer buffer string value
printer.getBuffer(); // Returns printer buffer
printer.setBuffer(newBuffer); // Set the printer buffer to a copy of newBuffer
printer.getWidth(); // Get number of characters in one line
Network printer
node examples/example.js tcp://xxx.xxx.xxx.xxx
Printer name via Printer module
node examples/example.js 'printer:My Printer'
Local port or file
node examples/example.js '\\.\COM1'
| Value | Description |
|---|---|
tcp://192.168.0.99:9100 | Network printer with port |
printer:auto | Auto select raw system printer via Printer or Electron printer module |
printer:My Printer Name | Select system printer by name via Printer or Electron printer module |
\\.\COM1 | Print via local port or file |
When using a system printer, you need to provide the driver. Use electron-printer or printer driver:
const ThermalPrinter = require("node-thermal-printer").printer;
const PrinterTypes = require("node-thermal-printer").types;
const electron = typeof process !== 'undefined' && process.versions && !!process.versions.electron;
let printer = new ThermalPrinter({
type: PrinterTypes.EPSON,
interface: 'printer:My Printer',
driver: require(electron ? 'electron-printer' : 'printer')
});
Use a custom printer driver:
const ThermalPrinter = require("node-thermal-printer").printer;
const PrinterTypes = require("node-thermal-printer").types;
let printer = new ThermalPrinter({
type: PrinterTypes.EPSON,
interface: 'printer:My Printer',
driver: MyCustomDriver
});
// you can also set the driver after init:
printer.setPrinterDriver(MyCustomDriver)
const ThermalPrinter = require("node-thermal-printer").printer;
const PrinterTypes = require("node-thermal-printer").types;
let printer = new ThermalPrinter({
type: PrinterTypes.EPSON,
interface: 'tcp://xxx.xxx.xxx.xxx'
});
printer.alignCenter();
printer.println("Hello world");
await printer.printImage('./assets/olaii-logo-black.png')
printer.cut();
try {
let execute = printer.execute()
console.log("Print done!");
} catch (error) {
console.error("Print failed:", error);
}
Example settings are the default when not specified.
printer.code128("Code128", {
width: "LARGE", // "SMALL", "MEDIUM", "LARGE",
height: 80, // 50 < x < 80
text: 2 // 1 - No text
// 2 - Text on bottom
// 3 - No text inline
// 4 - Text on bottom inline
});
printer.printQR("QR Code", {
cellSize: 3, // 1 - 8
correction: 'M', // L(7%), M(15%), Q(25%), H(30%)
model: 2 // 1 - Model 1
// 2 - Model 2 (standard)
// 3 - Micro QR
});
printer.pdf417("PDF417", {
rowHeight: 3, // 2 - 8
width: 3, // 2 - 8
correction: 1, // Ratio: 1 - 40
truncated: false, // boolean
columns: 0 // 1 - 30, 0 auto
});
printer.maxiCode("MaxiCode", {
mode: 4, // 2 - Formatted/structured Carrier Message (US)
// 3 - Formatted/structured Carrier Message (International)
// 4 - Unformatted data with Standard Error Correction.
// 5 - Unformatted data with Enhanced Error Correction.
// 6 - For programming hardware devices.
});
var data = "GS1-128" // Barcode data (string or buffer)
var type = 74 // Barcode type (See Reference)
var settings = { // Optional Settings
hriPos: 0, // Human readable character 0 - 3 (none, top, bottom, both)
hriFont: 0, // Human readable character font
width: 3, // Barcode width
height: 168 // Barcode height
}
printer.printBarcode(data, type, settings);
| # | Type | Possible Characters | Length of Data |
|---|---|---|---|
| 65 | UPC-A | 0 - 9 | 11, 12 |
| 66 | UPC-E | 0 - 9 | 6 – 8, 11, 12 |
| 67 | JAN13 | 0 - 9 | 12, 13 |
| 68 | JAN8 | 0 - 9 | 7, 8 |
| 69 | Code39 | 0 – 9, A – Z, SP, $, %, *, +, -, ., / | 1 – 255 |
| 70 | ITF (Interleaved 2 of 5) | 0 – 9 | 2 – 254 (even number) |
| 71 | CODABAR (NW-7) | 0 – 9, A – D, a – d, $, +, −, ., /, : | 2 – 255 |
| 72 | CODE93 | 00h – 7Fh | 1 – 255 |
| 73 | CODE128 | 00h – 7Fh | 2 - 255 |
| 74 | GS1-128 | NUL – SP(7Fh) | 2 – 255 |
| 75 | GS1 DataBar Omnidirectional | 0 – 9 | 13 |
| 76 | GS1 DataBar Truncated | 0 – 9 | 13 |
| 77 | GS1 DataBar Limited | 0 – 9 | 13 |
| 78 | GS1 DataBar Expanded | 0 – 9, A – D, a – d, SP, !, ", %, $, ', (, ), *, +, ,, -, ., /, :, ;, <, =, >, ?, _, { | 2 - 255 |
var data = "TEST" // Barcode data (string or buffer)
var type = 7 // Barcode type (See Reference)
var settings = { // Optional Settings
characters: 1, // Add characters (See Reference)
mode: 3, // Barcode mode (See Reference)
height: 150, // Barcode height (0≤ height ≤255)
}
printer.printBarcode(data, type, settings);
| # | Type |
|---|---|
| 0 | UPC-E |
| 1 | UPC-A |
| 2 | JAN/EAN8 |
| 3 | JAN/EAN13 |
| 4 | Code39 |
| 5 | ITF |
| 6 | CODE128 |
| 7 | CODE93 |
| 8 | NW-7 |
| # | Description |
|---|---|
| 1 | No added under-bar characters. Executes line feed after printing a bar code |
| 2 | Adds under-bar characters. Executes line feed after printing a bar code |
| 3 | No added under-bar characters. Does not execute line feed after printing a bar code |
| 4 | Adds under-bar characters. Does not execute line feed after printing a bar code |
| # | UPC-E, UPC-A, JAN/EAN8, JAN/EAN13, Code128, Code93 | Code39, NW-7 | ITF |
|---|---|---|---|
| 1 | Minimum module 2 dots | Narrow: Wide = 2:6 dots | Narrow: Wide = 2:5 dots |
| 2 | Minimum module 3 dots | Narrow: Wide = 3:9 dots | Narrow: Wide = 4:10 dots |
| 3 | Minimum module 4 dots | Narrow: Wide = 4:12 dots | Narrow: Wide = 6:15 dots |
| 4 | Narrow: Wide = 2:5 dots | Narrow: Wide = 2:4 dots | |
| 5 | Narrow: Wide = 3:8 dots | Narrow: Wide = 4:8 dots | |
| 6 | Narrow: Wide = 4:10 dots | Narrow: Wide = 6:12 dots | |
| 7 | Narrow: Wide = 2:4 dots | Narrow: Wide = 2:6 dots | |
| 8 | Narrow: Wide = 3:6 dots | Narrow: Wide = 3:9 dots | |
| 9 | Narrow: Wide = 4:8 dots | Narrow: Wide = 4:12 dots |
See CHANGELOG.md
v4.4.5 (25.3.2025)
FAQs
Print on Epson, Star, Tranca, Daruma and Brother thermal printers with Node.js
We found that rn-thermal-printer demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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