A Handy CLI Tool for Working with JSON
While I was at Kubecon this past week, one of the presenters showed off a handy CLI tool for working with JSON. It’s called jq, and in this post I’m going to show you a few ways to use jq. For the source of JSON output, I’ll use the OpenStack APIs.
If you’re not familiar with JSON, I suggest having a look at this non-programmer’s introduction to JSON. Also, refer to this article on using cURL to interact with a RESTful API for a bit more background on some of the commands I’m going to use in this post.
Let’s start by getting an authorization token for OpenStack, using the following curl command:
curl -d '{"auth":{"passwordCredentials":
{"username": "admin","password": "secret"},
"tenantName": "customer-A"}}'
-H "Content-Type: application/json"
http://192.168.100.100:5000/v2.0/tokens
This will return a pretty fair amount of JSON in the response, and it presents the first opportunity to use jq. Let’s say you only wanted the authorization token, and not all the other output. Simply add the following jq command to the end of your curl request:
curl -d '{"auth":{"passwordCredentials":
{"username": "admin","password": "secret"},
"tenantName": "customer-A"}}'
-H "Content-Type: application/json"
http://192.168.100.100:5000/v2.0/tokens |
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