Скачать или смотреть How to Easily Get Keys Without Values from JSON Files Using jq

Discover how to use `jq` to extract keys from JSON without values in a clean, list format. Learn the simple commands and options to make your JSON parsing effortless!
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This video is based on the question https://stackoverflow.com/q/72913987/ asked by the user 'Andrei Rînea' ( https://stackoverflow.com/u/1796/ ) and on the answer https://stackoverflow.com/a/72914055/ provided by the user 'chepner' ( https://stackoverflow.com/u/1126841/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Working with JSON and jq: Extracting Keys Without Values

When working with JSON files, especially larger ones like a Pipfile.lock, you might find yourself needing to extract specific information. One common task is getting the keys from a JSON object without their associated values. In this guide, we'll tackle this issue using the jq command-line tool.

The Challenge

In the Pipfile.lock JSON structure, for example, you might have something that looks like this:

[[See Video to Reveal this Text or Code Snippet]]

When you execute the command:

[[See Video to Reveal this Text or Code Snippet]]

You will receive output like this:

[[See Video to Reveal this Text or Code Snippet]]

However, what if you want to format this output so that:

It does not include the array brackets ([ and ]).

The keys are printed without quotes.

This is a common requirement, and the good news is that it is totally feasible using jq.

The Solution

To achieve your desired output, you can modify your jq command with a few simple tweaks.

Step 1: Extracting Array Elements

To extract the keys as individual strings instead of an array, you can use the following command:

[[See Video to Reveal this Text or Code Snippet]]

This command does the following:

The keys[] syntax tells jq to iterate over each key in the object located under .default, effectively flattening the array extraction.

Step 2: Outputting Raw Strings

By default, jq outputs values as JSON strings, which includes quotes. To remove those quotes and get purely raw output, add the -r option like this:

[[See Video to Reveal this Text or Code Snippet]]

Final Output

After running the command above, you'll get a clean output like:

[[See Video to Reveal this Text or Code Snippet]]

Summary

Using the jq tool to manipulate JSON data can greatly simplify your workflow. To summarize the steps:

Use .default | keys[] to extract keys without brackets.

Add -r to ensure the output is raw strings without quotes.

This approach makes it easier to work with keys in your JSON data, especially when dealing with complex configurations like those in a Pipfile.lock. Now, with just a few modifications to your command, you can get exactly the output you need.

Happy querying!