Convert sequence of JSON lines (JSONL) to JSON array

json bash jq jsonlines

jq -n '[inputs]' <in.jsonl >out.json

jq --slurp . <in.jsonl >out.json

json bash jq jsonlines

For the task at hand, using jq's "slurp" option or [inputs] entails a potentially huge waste of resources.

A trivial but efficient solution can be implemented in awk as follows:

awk 'BEGIN {print "[";} NF==0{next;} n=="" {print;n++;next;} {print ","; print;} END {print "]"}'

An equivalent efficient solution in jq is possible using foreach and inputs, and is left as an exercise.

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