change json file by bash script -

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I need your help to solve the following problem: I have a JSON file that looks like this: {"key1": "value1", "key2": "value2", "key3": "value3"}

How do I create a new key Can I add "code4" to "code4": "value4" ) by Bash script?

Thank you

: Li> On Debian-based systems such as Ubuntu, you can call it sudo apt-get jq < Li> install on OSX, with a homebree, install Jq

For example, depending on the following input string - output < Code> stdout : 

  jsonStr = "{" Key1 ":" value1 "," key2 ":" value2 "," key3 ":" value3 "} '  
 Remove "key3":  
  jq 'del (.key3)' & lt; & lt; "$ jsonStr"   
 value with value "value4" Add the key "key4":  
  jq '"{1 key4": "value4"}' << code   & lt; & lt; "$ jsonStr" 
 Change the value of the existing property "key1" to "new-value1":  
  jq '.key1 = "new-value1"' <  
 
 If you place an JSON file (conceptually speaking)  by using the " Key3 "deletion example, update: < / P> 
  # create a test file echo '{"key1": "value1", "key2": "value2", "key3": "value3"}' & gt; Take the test.json #Remove "key3" and return the results back to test.json (with the result it rests). Jq -c 'del (.key3)' test.json & gt; TMP $$ Jsn & amp; Mv tmp. $$ Json test.json   
 You can not replace the input file directly, so the result is written on a temporary file which successfully changes the input file.  
 Note that the  -c  option, which makes compact rather than beautiful printed JSON.  
 For  all the options and commands , on the  manual

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