await this.gremlinService.readClientSource.V().elementMap().toList() will return an Array of Maps.JSON.stringify() , which NestJS is likely calling for you, doesn't support Maps so you need to convert them into objects using something like Object.fromEntries().Join the Discord to ask follow-up questions and connect with the community
Apache TinkerPop is an open source graph computing framework and the home of the Gremlin graph query language.
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