GoJSON

GoJSON is a command line utility to handle json in command line.

What it does

• Retrieve nested objects
• Pretty print JSON
• Validate JSON
• Aggregate functions

Installing

Go Dev version

$ go get -u github.com/sarathsp06/gojson

Binray Release

download and use the binary as such for your platform

Tip:

In unix move the binary to PATH

Key Syntax

• Key is a set of . seperated nested values
• Can use 0-n numbers to refer to index in arrays
• Can use lower:upper syntax to refer to a range of an array. Eg: players.1:3
• Can use keys of inner objects directly on arrays or range of them. Eg: players.name where players is an array

Usage Examples

Getting a value

• Get a string:

$ echo '{"name":{"first":"Sarath","last":"Pillai"}}' | gojson name.last
"Pillai"

• Get a block of JSON:

$ echo '{"name":{"first":"Sarath","last":"Pillai"}}'  | gojson name

{
  "first": "Sarath",
  "last": "Pillai"
}

• Try to get a non-existent key:

$ echo '{"name":{"first":"Sarath","last":"Pillai"}}' | gojson names
nil

• Get an array value by index:

$ echo '{"people":[{"name":"saratha"},{"name":"syam"}]}' | gojson people.1.name                                               
"syam"

• Projection from a slice

$ echo '{"people":[{"name":"saratha"},{"name":"syam"},{"name":"singh"},{"name":"ping"}]}' | gojson people.2:.name 
[
  "singh",
  "ping"
]

• Slice of array

$ echo '{"people":[{"name":"saratha"},{"name":"syam"},{"name":"singh"},{"name":"ping"}]}' | gojson people.2:5     
[
  {
    "name": "singh"
  },
  {
    "name": "ping"
  }
]