Newline-delimited JSON over TCP

Stream structured data records over persistent TCP sockets using standard line breaks as message boundaries.

This protocol pairs the flexibility of JSON with the low-overhead delivery of raw TCP. It solves the buffering issues found in traditional REST calls by pushing individual objects separated by a single newline character (\n). Systems like Logstash and Fluentd use this to ingest millions of events per second. It is the go-to choice for high-throughput telemetry (such as IoT sensor grids) where you need to parse messages immediately without waiting for a closing array bracket.

https://ndjson.org/