Скачать или смотреть How to Append a String to a JSON Value Using jq

Learn how to use `jq` to efficiently append a string to a JSON value and update your JSON file easily.
---
This video is based on the question https://stackoverflow.com/q/72187636/ asked by the user 'dubru' ( https://stackoverflow.com/u/10440973/ ) and on the answer https://stackoverflow.com/a/72188296/ provided by the user 'sseLtaH' ( https://stackoverflow.com/u/16372109/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Find and append an string in json file using jq

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Append a String to a JSON Value Using jq

In today's digital world, working with JSON files is a common task, especially for developers and system administrators. A frequent requirement is to not only read data from these files but also manipulate it. One common operation is appending a string to a specific value within a JSON object. For instance, you might have a JSON file called meta.json where you wish to append -test to the current value of the name key, changing it from demo to demo-test. In this guide, we'll walk through the steps to accomplish this using the jq command-line tool as well as an alternative approach using sed. Let's dive in!\

Understanding the JSON Structure

Before we get into the mechanics of appending strings in jq, let's look at the structure of our JSON file. The original content of meta.json looks like this:

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

Here, the key name holds the value demo, which we want to change to demo-test.

Solution 1: Using jq

jq is a powerful command-line JSON processor that can manipulate JSON data effectively. To append -test to the name value, you can use the following command:

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

Breaking Down the Command

jq: Invokes the jq tool.

.data.name: Navigates to the name field in the nested JSON structure.

|=: This operator allows you to modify the value of the specified field.

. + "-test": This part appends the string -test to the existing value.

Output

Once you run the command, the output will appear as follows:

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

Solution 2: Using sed

If you prefer the versatility of sed, a stream editor for filtering and transforming text, you can achieve similar results with the following command:

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

Breaking Down the Command

sed: Invokes the sed tool.

/<name>/: Specifies that we are looking for the line containing <name>.

s/[[:punct:]]+ $/-test&/: This is a substitution command that finds punctuation characters at the end of the line and appends -test to the current value.

Output

The output from the sed command will also reflect the change to demo-test. However, note that this method might require more adjustment depending on your JSON's formatting or any additional complexity in the structure.

Conclusion

Appending a string to a JSON value is a task that can be done quite easily with tools like jq and sed. For precise JSON manipulation, jq is generally preferred due to its understanding of the JSON format. You can update your meta.json file and ensure it's structured correctly without any extra manual adjustments.

Now you can confidently append strings to your JSON values using these methods! Don’t hesitate to explore further into different jq filters and sed patterns to unlock more functionalities. Happy coding!