How to surround values and keys with double quotes using regular expressions in JavaScript

Question

How to surround values and keys with double quotes using regular expressions in JavaScript

I am in need of a valid JSON format to request ES. I currently have a string that looks like this:

{ 
time:  { 
          from:now-60d,
          mode:quick,
          to:now } 
}

However, when I attempt to use JSON.parse, I encounter an error because my string should actually be formatted like this:

 { 
time:  { 
          "from":"now-60d",
          "mode":"quick",
          "to":"now" } 
}

My question is, is there any solution to automatically add double quotes around keys and values of my string?

Thank you.

javascript json regex

Answer 1

Answer №1

Consider utilizing the following code snippet:

str.replace(/([a-zA-Z0-9-]+):([a-zA-Z0-9-]+)/g, "\"$1\":\"$2\"");

For a demonstration of this regex pattern, visit

this regex demo

Please Note

In the character group [a-zA-Z0-9-], I included alphabetical characters, digits, and a -. If you require different characters, feel free to adjust as needed.

Answer 2

Consider utilizing the following code snippet:

str.replace(/([a-zA-Z0-9-]+):([a-zA-Z0-9-]+)/g, "\"$1\":\"$2\"");

For a demonstration of this regex pattern, visit

this regex demo

Please Note

In the character group [a-zA-Z0-9-], I included alphabetical characters, digits, and a -. If you require different characters, feel free to adjust as needed.

Answer 3

Answer №2

This script is designed to enhance the formatting of JSON by adding quotes and eliminating any unnecessary commas at the end of objects.

function adjustJsonFormat(input){return input.replace(/"?([\w_\- ]+)"?\s*?:\s*?"?(.*?)"?\s*?([,}\]])/gsi, (input, key, value, ending) => '"'+key.replace(/"/gsi, '').trim()+'":"'+value.replace(/"/gsi, '').trim()+'"'+ending).replace(/,\s*?([}\]])/gsi, '$1');}

Note:

A different method has been created that also handles JSON arrays.

In addition, it changes single quotes to double quotes and ensures that numbers and booleans do not have additional quotation marks.

function adjustJsonFormat(input){
    return input.replace(/[\s\n\r\t]/gs, '').replace(/,([}\]])/gs, '$1')
    .replace(/([,{\[]|)(?:("|'|)([\w_\- ]+)\2:|)("|'|)(.*?)\4([,}\]])/gs, (input, start, q1, key, q2, value, end) => {
        value = value.replace(/"/gsi, '').trim();
        if(key){key = '"'+key.replace(/"/gsi, '').trim()+'"';}
        if(!value.match(/^[0-9]+(\.[0-9]+|)$/) && !['true','false'].includes(value)){value = '"'+value+'"';}
        if(key){return start+key+':'+value+end;}
        return start+value+end;
    });
}

The regular expressions used in this function have been validated using the safe-regex npm module

Answer 4

This script is designed to enhance the formatting of JSON by adding quotes and eliminating any unnecessary commas at the end of objects.

function adjustJsonFormat(input){return input.replace(/"?([\w_\- ]+)"?\s*?:\s*?"?(.*?)"?\s*?([,}\]])/gsi, (input, key, value, ending) => '"'+key.replace(/"/gsi, '').trim()+'":"'+value.replace(/"/gsi, '').trim()+'"'+ending).replace(/,\s*?([}\]])/gsi, '$1');}

Note:

A different method has been created that also handles JSON arrays.

In addition, it changes single quotes to double quotes and ensures that numbers and booleans do not have additional quotation marks.

function adjustJsonFormat(input){
    return input.replace(/[\s\n\r\t]/gs, '').replace(/,([}\]])/gs, '$1')
    .replace(/([,{\[]|)(?:("|'|)([\w_\- ]+)\2:|)("|'|)(.*?)\4([,}\]])/gs, (input, start, q1, key, q2, value, end) => {
        value = value.replace(/"/gsi, '').trim();
        if(key){key = '"'+key.replace(/"/gsi, '').trim()+'"';}
        if(!value.match(/^[0-9]+(\.[0-9]+|)$/) && !['true','false'].includes(value)){value = '"'+value+'"';}
        if(key){return start+key+':'+value+end;}
        return start+value+end;
    });
}

The regular expressions used in this function have been validated using the safe-regex npm module

Answer 5

Answer №3

Unquoted JSON may seem like a valid JSON format, but it is actually just JavaScript code. If you are confident in the source of this string:

var obj = eval("'({ 
time:  { 
      from:now-60d,
      mode:quick,
      to:now } 
 })'");

It's important to note that evaluating untrusted strings like this can pose a security risk.

If you are obtaining the data from Kibana and trust its source, then using eval on the string should be acceptable.

Alternatively, you could consider using regex as suggested by other responses, or work on adjusting your Kibana export to provide a properly formatted JSON string.

Answer 6

Unquoted JSON may seem like a valid JSON format, but it is actually just JavaScript code. If you are confident in the source of this string:

var obj = eval("'({ 
time:  { 
      from:now-60d,
      mode:quick,
      to:now } 
 })'");

It's important to note that evaluating untrusted strings like this can pose a security risk.

If you are obtaining the data from Kibana and trust its source, then using eval on the string should be acceptable.

Alternatively, you could consider using regex as suggested by other responses, or work on adjusting your Kibana export to provide a properly formatted JSON string.

Answer 7

Answer №4

Hello Idriss

If you are looking to add quotation marks around all valid key names and values, check out this expression. YCF_L's response is exactly what you need. However, here is an alternative solution for your reference.

{(?=[a-z])|[a-z](?=:)|:(?=[a-z])|[a-z](?=,)|,(?=[a-z])|[a-z](?=\})
str.replace(/{(?=[a-z])|[a-z](?=:)|:(?=[a-z])|[a-z](?=,)|,(?=[a-z])|[a-z](?)
=})/igm, $&");

Answer 8

Hello Idriss

If you are looking to add quotation marks around all valid key names and values, check out this expression. YCF_L's response is exactly what you need. However, here is an alternative solution for your reference.

{(?=[a-z])|[a-z](?=:)|:(?=[a-z])|[a-z](?=,)|,(?=[a-z])|[a-z](?=\})
str.replace(/{(?=[a-z])|[a-z](?=:)|:(?=[a-z])|[a-z](?=,)|,(?=[a-z])|[a-z](?)
=})/igm, $&");

How to surround values and keys with double quotes using regular expressions in JavaScript

Answer №1

this regex demo

Answer №2

Answer №3

Answer №4

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