Sumo Logic - Extract the Key from JSON object

Sumo Logic is a useful tool to monitor the logs from multiple micro-services, it has its own query language to retrieve data from the log message. One of them is extract Key/Value from JSON object within the results.

For example, you have below log information:
date: "2019-12-14"
type: "error"
body:"{
     \"eventid\": \"XXXX-XXXX-XXXX-XXXX\",
    \"userid\": "1234567890",
    \"action\":"sample"
}"
 
You need to get the "userid" from the JSON object "body", then you can write the code as below:
| json field=body "userid" |

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