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Many current tools and web services use JSON format for both input and output data. The jq tool proves very useful for extracting and processing JSON data for single-use situations or small scripts, especially shell scripts. Recently for a client I needed to create a small script to process API responses from Apache Marathon container orchestration system to identify any deployments exceeding a certain time limit. I took the opportunity to use the development of the script to present a brief tutorial on the use and capabilities of jq.

jq operates on the pipeline principle similar to many other UNIX utilities. However instead of single lines of text, the unit for jq is a JSON object. PIpeline operations can be chained together to extract data, construct summaries, or build new JSON objects and structures.

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The Marathon API call '/v2/deployments' returns a JSON array of hashes, each representing a deployment in progress. Below is a sample Marathon JSON output. You may wish to adjust the dates in the 'version' field so one or more of the deployments is not past the 30 minute 'overdue' threshold.


Below is the Bash shell script, including intermediate stages to show the development and use of some jq features:

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A small script such as this can't show the entire array of jq features, but should be enough to illustrate some basic concepts and provide a basis for further development. I find this iterative method useful in building up and testing complex operations, it lends itself well to experimentation and debugging.

For more information, see the jq manual

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  1. Jq is a lightweight and flexible command-line JSON processor. If you are a command line addict, you will like the official description jq is like sed for JSON data – you can use it to slice and filter and map and transform structured data with the same ease that sed, awk, grep and friends let you play with text.
  2. Jq did not write special code to overcome this problem. One good solution: Install moreutils using brew install moreutils or your favorite package manager. This contains the handy program sponge, for just this purpose. Use cat myfile jq blahblahblah sponge myfile.
  3. Figuring out this use case from the jq docs or jqplay has been a major struggle for me. I feel that this use case reflects 90% of what I would want to use jq for. I feel that if I can't get over this hump just from docs, there's no way I could justify bringing this tool on board with my team.
  4. What is the most efficient way of installing JQ on Mac (el capitan). I have the code downloaded to my mac but I would like to know how I can install and operate the via the command line.