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scout
Reading and writing in JSON, Plist, YAML and XML data made simple when the data format is not known at build time. Swift library and command-line tool. (by ABridoux)
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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.
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simdjson
Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks
Not 100% sure but you might find Scout interesting for your needs
Check out ZippyJSON.
It’s a Swift wrapper around simdjson and a drop-in replacement for JSONDecoder. The performance should be pretty good.
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.