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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Or use a lib that you link to. I like jsoncpp. It's not tHe FaStEsT lib, but the api is clear and easy to use, and the integration has never been an issue either.
try mine https://github.com/cppfw/jsondom
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Hence, a higher number means a more popular project.