Sometimes it's important to validate a promo code or promotion on the client-side, e.g. imagine you want to calculate and display a discounted price on the fly. That's why Voucherify comes with Voucherify.js - an open source JavaScript library which enables you to query the API.

Besides validation, Voucherify.js offers 3 other features:

• publish widget which enables your customers to get a unique voucher from a given campaign in exchange for providing email address
• subscribe widget which adds a customer to Voucherify. You can then use one of the automatic delivery channels to send him a coupon
• listing coupons from a given campaign.

Visit Github repo to get the up-to-date documentation.