convert data of text file into JSON array in bash - arrays

Question

I want output in the below JSON array format with command on linux/bash platform . Can anybody help
data in text file
test:test
test1:test1
test4:test4
Expecting output:
{array :
[
{test:test},
{test1:test1},
{test4:test4}
]
}

Answer 1

Using jq command line JSON parser:
<file jq -Rs '{array:split("\n")|map(split(":")|{(.[0]):.[1]}?)}'
{
"array": [
{
"test": "test"
},
{
"test1": "test1"
},
{
"test4": "test4"
}
]
}
The options Rs let jq read the whole file as one string.
The script splits this string into pieces in order to have the expected format.

Answer 2

Assuming you want actual JSON output:
$ jq -nR '{array: (reduce inputs as $line ([]; . + [$line | split(":") | {(.[0]):.[1]}]))}' input.txt
{
"array": [
{
"test": "test"
},
{
"test1": "test1"
},
{
"test4": "test4"
}
]
}

Answer 3

Creating a JSON works best with a dedicated JSON tool that can also make sense of raw text.
xidel is such a tool.
XPath:
xidel -s input.txt -e '{"array":x:lines($raw) ! {substring-before(.,":"):substring-after(.,":")}}'
(x:lines($raw) is a shorthand for tokenize($raw,'\r\n?|\n'), which creates a sequence of all lines.)
XQuery:
xidel -s input.txt --xquery '{"array":for $x in x:lines($raw) let $a:=tokenize($x,":") return {$a[1]:$a[2]}}'
See also this Xidel online tester.