# Logstash parse strings before a valid json
**URL:** https://discuss.elastic.co/t/logstash-parse-strings-before-a-valid-json/294578
**Category:** Logstash
**Created:** [January 17, 2022, 11:59am UTC](https://discuss.elastic.co/t/logstash-parse-strings-before-a-valid-json/294578 "2022-01-17T11:59:58Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Calin\_Tatar](https://discuss.elastic.co/u/Calin_Tatar)
#### Post date: [January 17, 2022, 11:59am UTC](https://discuss.elastic.co/t/logstash-parse-strings-before-a-valid-json/294578/1 "2022-01-17T11:59:58Z")
Hello, i have the following log : Received stock info for v2, payload: {'id': '1234dads', 'sku': '1QA0QWQ-1JFQQQ'} and i would like to add a new field with phase before json ,i tried the following config but is now working .
if "Received" in [information] and [kubernetes][namespace] == "namespace" {
grok {
match =\> ["information", "(?[^{]\*)"]
}
mutate { add\_field =\> { "payload\_msg" =\> "%{payload}"}}
json {
source =\> "information"
}
Can you please let me know what is wrong ?
paylod = Received stock info for v2, payload: and after parse the information field using json
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 14, 2022, 12:00pm UTC](https://discuss.elastic.co/t/logstash-parse-strings-before-a-valid-json/294578/2 "2022-02-14T12:00:22Z")
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