String Array to JSON String

Question

Introduction

I've seen throughout the code-golf challenges several simple tasks involving JSON, such as interpreting JSON strings with RegExs, and almost every other manipulation I could think of.

In a binding for AppleScript that I was using for a Node project, I noticed that objects would be returned in a strange way: there would be an array of properties in string form, instead of a JSON object being returned as expected. This is where the challenge comes in...

Algorithm

1. Add { to beginning of the output string
2. Iterate over all entries, adding them to the output string, delimited by ,
3. Add } to the end of the output string
4. Print out the output string

Challenge

Make this strange return format usable. Convert an array of JSON 'key:value's (in string form) to a full JSON object string.

Rules

• Any language that can do string manipulations allowed
• Must print out JSON string with surrounding curly braces {}, and double quotes "" around string values AND all properties ("property":"value" or "property":3.14, etc.)
• Must return a valid, parseable JSON string
• Lowest byte count wins per language

Example Input and Output

Input:

['prop1:"val1"', 'prop2:12', 'prop3:3.14', 'prop4:false']

Output:

'{"prop1":"val1", "prop2":12, "prop3":3.14, "prop4":false}'

Answer 1

Retina, 23 bytes

%0`\w+
"$&"
¶
,
.+
{$&}

Try it online! Explanation:

%0`\w+
"$&"

Quote all of the keys.

¶
,

Join the array elements together.

.+
{$&}

Wrap the result in brackets. This can also be done using the following code for the same byte count:

^
{
$
}

Answer 2

C 108

Thanks to Jonathan Frech this answer is now incredibly shorter
Thanks to @ceilingcat for some very nice pieces of golfing - now even shorter

i;main(c,v)char**v;{for(;++i<c;printf("%c\"%s\":%s",!~-i*79+44,v[i],++*v))*(*v=index(i[v],58))=0;puts("}");}

Try it online!

Answer 3

Python 3, 59 bytes

lambda x:"{%s}"%",".join('"'+a.replace(":",'":')for a in x)

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-6 bytes thanks to ovs

Answer 4

JavaScript (Node.js), 35 bytes

a=>JSON.stringify(eval(`({${a}})`))

Try it online! 43 bytes without builtins:

a=>`{${a.map(s=>s.replace(/\w+/,`"$&"`))}}`

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Answer 5

Lua, 122 bytes

loadstring[[s="{"for i,v in ipairs(...)do x,y=v:match("(.-):(.+)")s=s.."\""..x.."\":"..y..","end return s:sub(1,-2).."}"]]

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---

This is an anonymous function. It technically doesn't "print out JSON string [...]", but instead it returns this string, so that when calling it you could print. I did that because I needed to first convert the input from string to an actual list, and I did that on the argument of the function call.

If this makes my answer invalid I'll move the string to table (list) "parser" from the footer to the actual code. But I don't think it should, because the input shown as a table, so the code that takes a string and transforms it into a table shouldn't count.