JsonR is a JSON implementation that deals with multiple / circular references. You can find a detailed explanation of this library in a dedicated DZone article: https://java.dzone.com/articles/json-r-json-extension-deals.
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Install Node.js from: https://nodejs.org/.
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Clone this repository somewhere (say /path/to/jsonr).
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Run the server with the following commands:
$ cd /path/to/jsonr $ node jsonr-server.js -
Point your browser to: https://localhost:8080/index.html.
Play with the sample application and have a look at the source code.