🔧 How to Use JQ to find Key based on Value
Nachrichtenbereich: 🔧 Programmierung
🔗 Quelle: dev.to
USECASE
The aim of this page is to explain how to use jq to find a key based on a value in JSON data retrieved from Consul.
Consul KV Store: Used to store key-value pairs.
JSON Data: Example JSON data retrieved from Consul.
{
"a3e705d1-98d3-4c58-80a4-f9f9c9ec3e47": "CUSTOMER_1",
"d4b7e8e9-1b50-4f3d-b3d9-ea6b5feca1bd": "CUSTOMER_2",
"b21c9e36-4798-4387-ae1e-f6c678b0c14e": "CUSTOMER_3"
}
Objective: Find the key corresponding to a specific value.
jq Command: Tool for processing JSON data.
Basic jq Command:
jq -r 'to_entries[] | select(.value == "VALUE_YOU_ARE_LOOKING_FOR") | .key' yourfile.json
Integrating with Consul:
consul kv get global/uuid-to-customer-name | jq -r 'to_entries[] | select(.value == "VALUE_YOU_ARE_LOOKING_FOR") | .key'
Example Value: Searching for the value "anonymized_customer".
Step-by-Step Breakdown:
- Retrieve JSON from Consul:
consul kv get global/uuid-to-customer-name
- Convert JSON to Key-Value Pairs:
consul kv get customer-uuids | jq -r 'to_entries[]'
- Output:
{
"key": "a3e705d1-98d3-4c58-80a4-f9f9c9ec3e47",
"value": "CUSTOMER_1"
}
{
"key": "d4b7e8e9-1b50-4f3d-b3d9-ea6b5feca1bd",
"value": "CUSTOMER_2"
}
{
"key": "b21c9e36-4798-4387-ae1e-f6c678b0c14e",
"value": "CUSTOMER_3"
}
- Filter for Specific Value:
consul kv get global/uuid-to-customer-name | jq -r 'to_entries[] | select(.value == "anonymized_customer")'
- Output:
{
"key": "cde71158-f1d6-4707-88e0-28d1716f2790",
"value": "anonymized_customer"
}
- Extract the Key:
consul kv get global/uuid-to-customer-name | jq -r 'to_entries[] | select(.value == "anonymized_customer") | .key'
- Output:
cde71158-f1d6-4707-88e0-28d1716f2790
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