Juniper extension toolkit (JET) for Junos OS provides a modern programmatic interface for developers of third-party applications interfacing with Junos based devices. It supports consistent APIs across all Junos OS releases and platforms supporting JET. JET is an evolution of the Junos SDK with expanded capabilities, allowing customers and partners to build and run applications either directly on Junos devices or off-box, using a standard set of APIs. These internal and external applications interact directly with Junos OS's native features and components via APIs. Since JET is based on Apache Thrift, it also supports multiple languages running off-box to interact with the same JET APIs. This gives developers true flexibility to adapt Junos devices to business processes, with applications on many different development platforms. In this blog we will examine the Juniper Extension Toolkit for Junos OS, and some examples on how it can be used to boost operational efficiencies and productivity.