# LogStash::Json::ParserError: Invalid numeric value: Leading zeroes not allowed
**URL:** https://discuss.elastic.co/t/logstash-invalid-numeric-value-leading-zeroes-not-allowed/186150
**Category:** Logstash
**Tags:** elastic-stack-monitoring
**Created:** [June 17, 2019, 7:54pm UTC](https://discuss.elastic.co/t/logstash-invalid-numeric-value-leading-zeroes-not-allowed/186150 "2019-06-17T19:54:03Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@valleram](https://discuss.elastic.co/u/valleram)
#### Post date: [June 17, 2019, 7:54pm UTC](https://discuss.elastic.co/t/logstash-invalid-numeric-value-leading-zeroes-not-allowed/186150/1 "2019-06-17T19:54:03Z")
Hi,
I'm trying to parse some json strings which contain an integer field with the value `duration":0000`.
I tried to convert it to string type but didn't work. I'm still receiving the following error.
`# "message" } mutate { convert => { "duration" => "string" } } }`
Can you help me?
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### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [June 17, 2019, 8:42pm UTC](https://discuss.elastic.co/t/logstash-invalid-numeric-value-leading-zeroes-not-allowed/186150/2 "2019-06-17T20:42:18Z")
Try running [this](https://discuss.elastic.co/t/trying-to-add-ruby-filter-to-remove-leading-zero/168901/4) filter _before_ you parse the JSON. It might need tweaking to make the pattern more specific.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 15, 2019, 8:42pm UTC](https://discuss.elastic.co/t/logstash-invalid-numeric-value-leading-zeroes-not-allowed/186150/3 "2019-07-15T20:42:18Z")
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