Juniper presented at Networking Field Day 26 on Sept 14, 2021 - I really recommend you check out the presentation on network automation that Ryan and Jake did, you will likely learn something new if you are not staying super current on network automation and APIs. Even if you are staying current, it is worth a watch honestly.
Jake showed off Postman (which is an open source tool and is an API platform for building and using APIs) and how they are leveraging the "Power of the Juniper API". More importantly, they provided a Postman Collection Runner (the Collection Runner allows you to run sets of requests in a specified sequence - this link explains the runner) for free which is really amazing. You can find the Mist Runner Collection (this is the link to their actual collection) up on GitHub. This means that folks who are trying to get started with automation in networking don't have to start from zero. This helps with the stress of the situation where your management team expects you to be at automation hero level in a week or two. Jake does a full hands on demo of his runner deploying a campus fabric from a simple CSV initialization file (he provides example files too.) It really is pretty cool. Using a Collection to do workflow and automation when you are leveraging an API makes a lot of sense. And when a vendor releases for free how to leverage a tool like this to help make you life easier, it is worth checking out. You can see from the Postman UI, it is really straight forward.
You do need to create a free account with Postman, but you have to do that for things like GitHub too, and the value you get from this tool make it worth the inconveniences of doing so.
I'm excited to see vendors sharing their tooling, scripts and examples for the community to learn from. It is super difficult to get started in network API and automation when you also have to run and operate a day to day network. Being able to leverage what other smart engineers have put time and energy into in invaluable in the learning part of the journey. I look forward to seeing more content from Juniper in this space.