function::json_set_prefix - Linux
Overview
json_set_prefix is a versatile tool that provides an easy and efficient way to modify JSON data by setting the prefix for all keys within a specified JSON object. It’s particularly useful for tasks such as restructuring or organizing JSON data, and can be seamlessly integrated into various scripting or data processing workflows.
Syntax
json_set_prefix [-c] [-e] [-i] [-f TEMPLATE] [-j FORMAT] [-l] [--strip-key] [-t] [-w] [-s] <prefix> <json_input> [<json_output>]
Options/Flags
- -c: Check for valid JSON input and output.
- -e: Process JSON input and output as environment variables.
- -f TEMPLATE: Specify a template string for key substitution. Use
${key}
to replace the original key. - -i: Indent the JSON output for improved readability.
- -j FORMAT: Specify the output format for the JSON output (e.g., compact, pretty).
- -l: List all keys and values in the JSON object, prefixed with the specified prefix.
- –strip-key: Remove the original key from the output JSON.
- -s: Silently ignore errors and continue processing.
- -t: Convert the input JSON to JSON text (i.e., enclose in quotes).
- -w: Wrap the output in an array.
Examples
1. Setting Prefix for All Keys:
json_set_prefix "new_prefix_" '{ "key1": "value1", "key2": "value2" }'
Output:
{ "new_prefix_key1": "value1", "new_prefix_key2": "value2" }
2. Using Template for Key Substitution:
json_set_prefix -f "${prefix}_${key}" '{ "key1": "value1", "key2": "value2" }'
Output:
{ "prefix_key1": "value1", "prefix_key2": "value2" }
3. Listing Keys with Prefix:
json_set_prefix -l my_prefix '{ "key1": "value1", "key2": "value2" }'
Output:
my_prefix_key1: value1
my_prefix_key2: value2
4. Removing Original Keys:
json_set_prefix my_key -s '{ "key1": "value1", "my_key": "my_value" }'
Output:
{ "my_key": "my_value" }
Common Issues
- Invalid JSON Input/Output: Ensure your JSON data is valid and properly formatted. Use the
-c
option to check for any errors. - Conflicting Prefix: If the specified prefix already exists in the JSON object, it will be overwritten.
Integration
json_set_prefix can be easily chained with other Linux commands for advanced processing tasks. For instance:
cat json_data.json | json_set_prefix my_prefix | jq '.my_prefix_key1'
Related Commands
- jq: A powerful command-line tool for manipulating JSON data.
- json_pp: A utility for pretty printing and minifying JSON data.