Json

References

• JSON.org
• Parsing JSON is a Minefield

Tools

• jq — a command-line tool for manipulating JSON.

• jsonptr — same, but extra speed and safety.

• jj — JSON Stream Editor (command line utility).

Specification

object {} { members } members pair pair , members pair string : value array [] [ elements ] elements value value , elements

value string number object array true false null string "" " chars " chars char char chars

char any-Unicode-character- except-"-or-\-or- control-character \" \\ \/ \b \f \n \r \t \u four-hex-digits

number int int frac int exp int frac exp int digit digit1-9 digits - digit - digit1-9 digits frac . digits

exp e digits digits digit digit digits e e e+ e- E E+ E-

JSON query

Example of query:

{ "name" : "my_beautiful_project" }

Tips

Convert CSV to JSON

jq -R -r 'split(",") | {name:.[0],age:.[1]}' file.csv

Using JQ

Let's consider this sample JSON:

[
   {
   "tabs": [
     {
       "title": "foo",
       "windows": [
         {
           "columns": 137,
           "title": "first",
           "lines": 74,
         }
       ]
     },
     {
       "title": "bar",
       "windows": [
         {
           "columns": 68,
           "lines": 74,
           "title": "one"
         },
         {
           "columns": 67,
           "lines": 37,
           "title": "two"
         },
         {
           "columns": 67,
           "lines": 37,
           "title": "three"
         }
       ]
     }
   ]
   }
]

• Query the lines of windows with title == "two"

# Note the anonymous root array
jq '.[].tabs[].windows[] | select( .title == "two" ) | .lines' kitty.json