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Just-in-time label printing on the Zebra ZP450 using node.js + Easypost + Pusher + cups

This is the script we use at yerdle to print labels from our Rails backend to our Zebra ZP450 printer.

the Zebra

See this blog post for the whole story.

dotenv = require('dotenv')
PusherClient = require('pusher-node-client').PusherClient
easypost = require('node-easypost')(process.env.EASYPOST_SECRET_KEY)
child_process = require('child_process')
fs = require('fs')
request = require('request')
pusher_client = new PusherClient
appId: process.env.PUSHER_APP_ID
key: process.env.PUSHER_KEY
secret: process.env.PUSHER_SECRET
pres = null
pusher_client.on 'connect', () ->
pres = pusher_client.subscribe("shipments")
pres.on 'new', (data) ->
console.log "shipment #{data.easypost_shipment_id} with tracking number #{data.tracking_code}"
easypost.Shipment.retrieve data.easypost_shipment_id, (err, shipment) ->
console.log("ERROR: #{err}") if err
shipment.label {file_format: 'zpl'}, (err, shipment) ->
console.log("ERROR: #{err}") if err
console.log "Fetching #{shipment.postage_label.label_zpl_url}"
lpr = child_process.spawn "lpr", ['-P', process.env.ZEBRA_PRINT_QUEUE_NAME, '-o', 'raw']
lpr.on 'close', (code) ->
console.log "Child process exit with code #{code}"
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