ServiceNow · Module 8 of 10

Scripting with JavaScript

When and how ServiceNow is coded.

📖 Key ideas

ServiceNow scripts are written in JavaScript.
Client scripts run in the browser on forms, for example to show or hide a field.
Business rules run on the server when records are inserted, updated or queried.
GlideRecord is the server API to query and update tables.
Script includes hold reusable server code.

💡 Real-life example: Like rules in a library: the front desk checks your card as you walk in (client side), and the system updates records behind the counter (server side).

Client scriptBrowser-side form script

Business ruleServer script on record events

GlideRecordServer API to query tables

Script includeReusable server code