remove all blank space before double and after double quote marks

I've used below formula to remove all blank space before " and after " but not effort.

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var test_string = '{" 1 ": "b.) some pasta salad", "   10": "   a.) Yes, some bread", "11  ": "   a.) eggs and toast  " }'
var test_string_format = test_string.replace(/^[ '"]+|[ '"]+$|( ){2,}/g,'$1')
    
console.log(test_string_format)

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How can I use regex to get the desired output?

{"1":"b.) some pasta salad","10":"a.) Yes, some bread","11":"a.) eggs and toast" }

Assuming that the string content is always valid JSON, you can do it like this:

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var str = '{" 1 ": "b.) some pasta salad", " 10": " a.) Yes, some bread", "11 ": " a.) eggs and toast " }'

const res=JSON.stringify(Object.fromEntries(Object.entries(JSON.parse(str)).map(e=>e.map(e=>e.trim()))))

console.log(res)

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I know, this is kind of a "goofy" solution, but it works for the given sample string.

The snippet parses the JSON string, then converts the resulting object into an array of arrays. Each element of each sub-array is then .trim()-med and at the end of the operation the object is reconstructed via .Object.fromEntries() and turned back into a JSON string via JSON.stringify().

Replace zero or more spaces, followed by a quote, followed by zero or more spaces, with just the quote:

replaceAll(/ *" */g, '"')

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const test_string = '{" 1 ": "b.) some pasta salad", "   10": "   a.) Yes, some bread", "11  ": "   a.) eggs and toast  " }'

const trimmed = test_string.replaceAll(/ *" */g, '"');

console.log(trimmed);

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<!-- begin snippet: js hide: false console: true babel: false -->

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const test_string = '{" 1 ": "b.) some pasta salad", "   10": "   a.) Yes, some bread", "11  ": "   a.) eggs and toast  " }';

const test_string_format = test_string.replace(/\s*"\s*/g, '"');

console.log(test_string_format);

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• \s: matches any white-space character
• *: matches zero or more of the prev character(\s)
• ": matches the double quote character

const regex = /(\s*["]\s*)/gm;

var test_string =  = `{" 1 ": "b.) some pasta salad", "   10": "   a.) Yes, some bread", "11  ": "   a.) eggs and toast  " }
`;

console.log(test_string.replace(regex, '"'))

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    console.log('{" 1 ": "b.) some pasta salad", "   10": "   a.) Yes, some bread", "11  ": "   a.) eggs and toast  " }'
    .replaceAll(/( *\" +)|( +\ *)/ig,'"'))

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