Apply a function to each JSON line and re-emit it.
The one and only argument is some javascript code that is executed for each record.
To demonstrate we will apply the filter to just one line:
echo '{"bee":99,"wasp":27}' | jline-map 'record.sum = record.bee + record.wasp'
returns: {"bee":99,"wasp":27,"sum":126}
echo '{"message":"Elsken"}' | jline-map "record.sig = require('crypto').createHash('md5').update(record.message).digest('hex');"
returns: {"message":"Elsken","sig":"98769e3110755c13e4f5e8ea2b44f3a2"}
-
record- the parsed JSON. -
recordNumber- the line number, excluding lines that are not well formed JSON. -
line- the raw string -
lineNumber- the line number.
For a more general and more powerful alternative, see json-foreach.