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pick_json

pick_json

Cross-platform command line utility to extract and/or evaluate json. No weird new language or syntax; just use basic javascript notation in your one-liners. Pipe data into it as part of script chain or read from a file. Honey Badger doesn't care.

Options

  Usage: pick_json [options]

  Options:

    -h, --help              output usage information
    -V, --version           output the version number
    -k, --keys              Just output the keys. Will output the root keys if no expression is given
    -e, --exp <expression>  Expression to filter the json. Must start with an attribute or index
    -f, --file <file>       Use <file> instead of standard input
    -v, --verbose           Verbose errors

Example
    $ echo '[ { "bar" : 42 } ]' |  pick_json -e "[0].bar > 40" #returns true

Installation

Assumes you have Node installed

npm install -g pick_json

Examples

We are using the following json data file as input data in the examples. You can find it in the test directory

{
   "redis": {
      "connected": true,
      "ready": true,
      "connections": 1,
      "commandsSent": 9,
      "commandQueue": {
         "tail": [],
         "head": [],
         "offset": 0
      }
   },
   "error_codes" : [2001, 4004]
}

Picking from an array

pick_json -e error_codes[1] test/example.json

returns 4004

Picking from a nested structure

pick_json -e redis.connected test/example.json

returns true

Filtering data

Remember, the expr can be any valid expression operating on the data

pick_json -e "error_data.filter(err => err > 3000)" data.json

returns [4004]

When receiving an array

echo [ { "bar" : 42 } ] |  pick_cli [0].bar 

returns 42

Extracting data from a http service

Use curl to extract the data and pipe it into pick_json

curl -s mysite.com/service.json | pick_json -e stats.uptime