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CLI

Pino provides a command line interface that can be used to parse Pino log lines into an easy to read format.

To use the command line tool, we can install pino globally:

npm install -g pino

The pretty-printed output will highlight the message value of the input JSON. By default, Pino provides this message value at the msg key. A custom key can be specified with -m <key>.

pino -m fooMessage will transform this:

{"pid":14139,"hostname":"MacBook-Pro-3.home","level":30,"fooMessage":"hello world","time":1457537229339,"v":1}

Into this:

[2016-03-09T15:27:09.339Z] INFO (14139 on MacBook-Pro-3.home): hello world

There are also two transformer flags:

  • -t that converts Epoch timestamps to ISO timestamps.

    cat log | pino -t

  • -l that flips the time and level on the standard output.

    cat log | pino -l

pino -t will transform this:

{"pid":14139,"hostname":"MacBook-Pro-3.home","level":30,"msg":"hello world","time":1457537229339,"v":1}

Into this:

{"pid":14139,"hostname":"MacBook-Pro-3.home","level":30,"msg":"hello world","time":"2016-03-09T15:27:09.339Z","v":1}

pino -l will transform this:

[2016-03-09T15:27:09.339Z] INFO (14139 on MacBook-Pro-3.home): hello world

Into this:

INFO [2016-03-09T15:27:09.339Z] (14139 on MacBook-Pro-3.home): hello world

If you would like to enforce the output to be color encoded you can specify the -c flag cat log | pino -c will transform this:

{"pid":14139,"hostname":"MacBook-Pro-3.home","level":30,"fooMessage":"hello world","time":1457537229339,"v":1}

Into this:

[2017-04-25T17:32:09.662Z] �[32mINFO�[39m (24280 on SP2): �[36mhello world�[39m