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https://issues.apache.org/jira/browse/TINKERPOP-2497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17253561#comment-17253561
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Ben Smith commented on TINKERPOP-2497:
--------------------------------------

Of that I am not certain.

I am able to get the proper output when I use a wrapper around the response 
from above and before JSON.stringify.

 

 
{code:java}
const runTest=async ()=>{
const map= await  g.V().has('name','ben').elementMap().toList()
  console.log(JSON.stringify(mapToObj(map)))
}
const normalizeData= (gremlinData)=> {
    // Do this so that JSON.stringify works for maps
    (Map.prototype).toJSON = function () {
      return Object.fromEntries(this);
    };
    const mapStrippedData = JSON.parse(JSON.stringify(gremlinData));
    // Undo it so that we don't permanently pollute globals
    (Map.prototype).toJSON = undefined; 
    return mapStrippedData;
 }
{code}
However, this requires a combination of parse and stringify which seems like it 
would be slow on large lists.
I would assume the gremlin javascript would handle this as it might be faster 
than in application or on the client.  

 

> Gremlin JS Serializer always empty [{}] with valueMap(), entitypMap()
> ---------------------------------------------------------------------
>
>                 Key: TINKERPOP-2497
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2497
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: javascript
>    Affects Versions: 3.4.9
>            Reporter: Ben Smith
>            Priority: Minor
>
> Sorry if I made this ticket incorrectly.
>  
> I've installed gremlin as indicated.
> Running such a call as 
> g.V(id).elementMap().toList(); fails to return from my client application
> output results is always [{}]
> same with  return g.V(id).valueMap().toList();
> The above calls can output to the console correctly but not be serialized.
> Other toList calls work when the type is Vector. but seem to fail with Map.
> I am running Express, against Tinkertop 3.4. 



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