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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.
While older than Highlight-Indentation-for-Emacs, you can see also https://github.com/DarthFennec/highlight-indent-guides, the latter supports dynamic indent width detection (may not be important for JS, though).
I use https://github.com/antonj/Highlight-Indentation-for-Emacs/ for it.. it's available on melpa.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.