modifying json with jsonbuilder in Groovy

Question

I am trying to modify content of json and then print it to see if it has changed with this code but getting error

 def builder = new JsonBuilder(request)
 log.info(builder.content)
 builder.content.device.dpidsha1= 'abcd'  
 log.info(builder.toPrettyString())

error:

no such property: device

json looks like this:

{
   "app":{ },
   "at":2,
   "badv":[ ],
   "bcat":[ ],
   "device":{
      "carrier":"310-410",
      "connectiontype":3,
      "devicetype":1,
      "dnt":0,
      "dpidmd5":"268d403db34e32c45869bb1401247af9",
      "dpidsha1":"1234",
.
.
}

can someone help in understanding what am i doing wrong and how can i correct it.

score 18 · Accepted Answer · edited Sep 02 '23 at 11:48

18

You need to parse incoming data, then modify it with JsonBuilder

import groovy.json.JsonBuilder
import groovy.json.JsonSlurper

def data = """
{
   "app":{ },
   "at":2,
   "badv":[ ],
   "bcat":[ ],
   "device":{
      "carrier":"310-410",
      "connectiontype":3,
      "devicetype":1,
      "dnt":0,
      "dpidmd5":"268d403db34e32c45869bb1401247af9",
      "dpidsha1":"1234" 
   }
}"""

def slurped = new JsonSlurper().parseText(data)
def builder = new JsonBuilder(slurped)
builder.content.device.dpidsha1 = 'abcd'  
println(builder.toPrettyString())

edited Sep 02 '23 at 11:48

MinosL

138
1
10

answered Sep 09 '14 at 15:44

Opal

81,889
28
189
210

Thanks! Whatever that means :) – Opal Sep 09 '14 at 16:21
@Opal: I didn't know about `toPrettyString()` before :) – Paweł Piecyk Sep 09 '14 at 16:22
1

Ah... you're right - so I'll vote up the question too ;) – Paweł Piecyk Sep 09 '14 at 16:34
Corrected @mmigdol. Thanks! Not sure if groovy's parser behavior is correct here. It should fail with such errors :/ – Opal Sep 09 '14 at 16:44
Unfortunately it fails to parse this JSON without curly brace in groovy 2.1.6 but works perfectly fine in 2.3.6 :/ – Paweł Piecyk Sep 09 '14 at 17:10
Yes I know that. It works in such a way after introducing Boon parser. – Opal Sep 09 '14 at 17:20
@Opal Thank You. its printing json with changed value. I noticed in printed json that it has rearranged a lot of values. Not sure why, doesnt seem like alphabatically. But it should work(my server not responding right now). Is there a way to print the same way as original request with changed value? – user1207289 Sep 09 '14 at 17:27
Bo idea how to do it. I suppose the order may be random. – Opal Sep 09 '14 at 17:29
2

Excellent so `.content` is the key here to modify this json. – StackEng2010 Feb 02 '16 at 21:14
Thanks. So the var `content` has nothing to do with the `builder.content`, correct? – NaveenKumar Namachivayam Feb 10 '22 at 04:06
1

@NaveenKumarNamachivayam `builder.content` refers to [this](http://docs.groovy-lang.org/next/html/gapi/groovy/json/JsonBuilder.html#getContent()) method - correct, it has nothing to do with var `content`. – Opal Feb 10 '22 at 08:26
Thanks @Opal for the clarification. – NaveenKumar Namachivayam Feb 10 '22 at 17:33
I think the variable in the example should be named differently for clarification (e.g. `def data = """...`). I tripped over the name shadowing as well. – MinosL Aug 31 '23 at 13:32

modifying json with jsonbuilder in Groovy

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