convert String to json object with wrong string

const unformattedText = "[{'techid':'0128','daPoints':3,'speedingPoints':3,'fleetInspectionPoints':3,'lofPoints':3,'missedTrgModules':null,'fullName':'MANPREET SINGH','safetyInspectPoints':3,'missedTrgPoints':3,'speeding_qty':null,'safetyTotalPoints':21,'atFaultPoints':3,'atFaultAccident':null,'region':'PYEM','supervisor':'AGHATOR OSA','driverAlert':null,'status':'A'}]"

// convert with a regex
const formattedText = unformattedText.replace(/'/g, "\"")
console.log(formattedText)

// convert to object
const object = JSON.parse(formattedText)
console.log(object)

/**
 * @typedef  {function(StringPosition): boolean} BruteForce
 *                         A function that takes information about the current
 *                         position of the single-quote in the misformatted
 *                         string the parser found.
 *
 *                         And returns a boolean whether the parser will use
 *                         brute-force parsing, with time-complexity `O(2^n)`.
 *
 * @typedef  {function(StringPosition): Guess} Heuristic
 *                         A function that takes a reference the parser state
 *                         information, and modifies the parser guess state
 *                         using the given reference.
 *
 *                         This allows for much more complex logic.
 *
 *                         Example:
 *
 *                         Situations where the single-quote (`'`) needs to be
 *                         replaced by an escaped double-quote (`\\"`).
 *
 * @typedef  {("array"|"field"|"object-value"|"value")} JSONType
 *                         A string union type JSON types for arrays, object
 *                         fields, object values, and values.
 *
 * @typedef  {("\""|"\'")} Quote
 *                         One single-quote (`'`) or double-quote (`""`)
 *                         string character.
 *
 * @typedef  {("\\\""|"\\'")} EscapedQuote
 *                         One single-quote (`\\'`) or double-quote (`\\"`)
 *                         string character, preceded by a reverse solidus
 *                         (`\`), to escape it from the usual JSON
 *                         interpretation.
 *
 * @typedef  {Object}      StringPosition
 *                         An object containing information on where in a
 *                         string a single-quote character was found by the
 *                         parser.
 *
 * @property {Number}      StringPosition.stringIndex The index of the
 *                         single-quote in the misformatted string the parser
 *                         is currently trying to correct.
 *
 * @property {Number}      StringPosition.characterIndex The UTF-32 character
 *                         pseudo-index `index - (UFT-16 surrogate pairs /2)`
 *                         of the single-quote in the misformatted string the
 *                         parser is currently trying to correct.
 *
 * @property {String}      StringPosition.followingString The JSON substring
 *                         after the single-quote.
 *
 * @property {String}      StringPosition.precedingString The JSON substring
 *                         before the single-quote.
 *
 * @property {Guess}       StringPosition.currentGuess An object containing
 *                         information about a parser attempt to reformat a
 *                         JSON string. It contains a reformatted substring
 *                         the parser generated, and whether the internal
 *                         heuristics consider the substring to end in any
 *                         incompleted JSON type.
 *
 * @typedef  {Object}      Guess
 *                         An object containing information about a parser
 *                         attempt to reformat a JSON string. It contains a
 *                         reformatted substring the parser generated, and
 *                         whether the internal heuristics should consider the
 *                         substring to end in an incompleted JSON string.
 *
 * @property {String}      Guess.string The parser guess of how to reformat
 *                         JSON string. It is set to the previously parsed
 *                         guess, with future parser guesses appended to it.
 *
 * @property {Boolean}     Guess.isString The internal flag for `preParse`
 *                         that determines whether the algorithm interprets
 *                         current parsing as parsing the middle of a JSON
 *                         string value.
 *
 * @property {Boolean}     Guess.isEscaped The internal flag for `preParse`
 *                         that determines whether the algorithm interprets
 *                         current parsing as parsing a character escape
 *                         sequence in the middle of a JSON string value. It is
 *                         a number to accommodate unicode escape sequences.
 *
 *                         Only works for:  `\'`. not: `\"`, `\\`, `\/`, `\n`,
 *                         `\r`, `\b`, `\f`, `\t` or `\uXXXX`.
 *
 * @property {Boolean}     Guess.isObjectField The internal flag for
 *                         `preParse` that determines whether the algorithm
 *                         interprets the current parsing state as parsing
 *                         the middle of a JSON object value.
 *
 * @property {Boolean}     Guess.isObjectValue The internal flag for
 *                         `preParse` that determines whether the algorithm
 *                         interprets the current parsing state as parsing
 *                         the middle of a JSON object field.
 *
 * @property {Number}      Guess.isObject The internal flag for `preParse`
 *                         that determines whether the algorithm interprets
 *                         the current parsing state as parsing the middle of
 *                         a JSON object. It is a number to track how many
 *                         objects the single-quote is nested within.
 *
 * @property {Number}      Guess.isArray The internal flag for `preParse` that
 *                         determines whether the algorithm interprets the
 *                         current parsing state as parsing the middle of a
 *                         JSON array value. It is a number to track how many
 *                         arrays the single-quote is nested within.
 *
 * @property {Number}      Guess.aufoFilled The internal flag for `preParse`
 *                         that determines whether the algorithm already
 *                         reformatted this string index with a previous RegEx
 *                         heuristic solution. Is a string for how many future
 *                         indexes were prefilled. Default: `0`.
 *
 * @property {JSONType}    [Guess.isJSONType] The internal flag for `preParse`
 *                         that determines whether the algorithm interprets
 *                         the current parsing state as parsing the middle of
 *                         specific JSON type. It is a string union type for
 *                         arrays, object fields, object values, and values.
 *                         Used to keep track of the JSON type being parsed,
 *                         without including type nesting depth information.
 */

/**
 * @description            Reformats a misformatted JSON string to valid JSON.
 *
 *                         **NOTE:** This function assumes that all
 *                         double-quotes are escaped correctly, like: `\"`.
 *
 *                         If there are improperly escaped double-quotes, this
 *                         function will not be able to reformat the
 *                         misformatted JSON properly, unless custom logic in
 *                         an `opts.heuristic` function is used.
 *
 *                         **NOTE:** this is _**NOT**_ designed for
 *                         performance or large JSON strings. This can have
 *                         `O(2^n)` time-complexity!
 *
 * @param    {String}      misformattedJSON The string that is invalidly
 *                         formatted for JSON by using single-quotes (`'`)
 *                         instead of double-qutoes (`"`) to delimit string
 *                         values and object fields.
 *
 * @param    {Heuristic}   [heuristic] A function that takes a reference the
 *                         parser state information, and modifies the parser
 *                         guess state using the given reference. This allows
 *                         for much more complex logic.
 *
 *                         Example:
 *
 *                         Situations where the single-quote (`'`) needs to be
 *                         replaced by an escaped double-quote (`\\"`).
 *
 * @param    {BruteForce}  [bruteForce] A function that takes information
 *                         about the current position of the single-quote in
 *                         the misformatted string the parser found. And
 *                         returns a boolean whether the parser will use
 *                         brute-force parsing, with time-complexity `O(2^n)`.
 *
 * @param    {Boolean}     [TRY_HARD] A flag to brute-force with default,
 *                         heuristics, with time-complexity at around:
 *                         `O(2^n)`. Can be better than a `bruteForce`, but
 *                         still not reccommended, use `heuristic` if possible.
 *
 * @returns  {String[]}    The reformatted string, or array of reformatted
 *                         strings, if there was no error in parsing.
 */
function preParse(misformattedJSON, bruteForce, heuristic, TRY_HARD) {
    /*
  if (TRY_HARD)
    console.warn(
      "THIS HAS O(2^n) TIME COMPLEXITY, MAKE SURE YOU KNOW WHAT YOU'RE DOING..."
    )
  */

    /**
     * @type   {Guess[]}     Array to store all of the parser's possible
     *                       solutions. Holds strings of the parser guesses.
     *                       Used when strings are ambiguous because of
     *                       incorrect formatting, and brute-forcing. Is
     *                       appended to by recursive calls to `preParse`.
     */
    let guesses = [
        {
            string: "",
            isString: false,
            isEscaped: false,
            isArray: 0,
            isObject: 0,
            isObjectField: false,
            isObjectValue: false,
            isJSONType: undefined,
            aufoFilled: 0
        }
    ]

    /**
     * @type   {String[]}    Fixed-width array to index each UTF-32 character.
     *                       JavaScript strings are indexed by UTF-16 code units,
     *                       which are 2 bytes (16 bits) in length, a single
     *                       UTF-32 character is 4 bytes (32 bits), the same as
     *                       a complete UTF-16 surrogate pair, (which is two
     *                       UTF-16 code units).
     */
    let fixedWidthCharacterArray = []

    // iteration over each UTF-32 code point to add to UTF-32 array
    for (const UTF16CodePoint of misformattedJSON)
        fixedWidthCharacterArray.push(UTF16CodePoint)

    // loop over UTF-32 characters
    for (
        let characterIndex = 0, stringIndex = 0;
        characterIndex < fixedWidthCharacterArray.length;
        stringIndex += fixedWidthCharacterArray[characterIndex].length,
            characterIndex++
    ) {
        /**
         * @type {String}      Current UTF-32 code point in character array.
         */
        const character = fixedWidthCharacterArray[characterIndex]

        // loop over all guesses, and evaluate thier likelihood,
        // reversing over array to add or remove guesses
        // without changing the portion of the array being looped over
        for (let guessIndex = guesses.length - 1; guessIndex >= 0; guessIndex--) {
            /**
             * @type {Guess}     Parsers's guess of how to reformat JSON string. It
             *                   is set to the previous parser guess, with future
             *                   parser guesses appended to it. It also includes
             *                   state information used for the default heuristics.
             */
            const currentGuess = guesses[guessIndex]

            // check guess auto-fill
            if (currentGuess.aufoFilled) {
                // decrement number of pre-parsed characters,
                // since one was just manually parsed
                currentGuess.aufoFilled--

                // guess already parsed this part of the string using a RegExp,
                // loop to next guess
                continue
            }

            const {
                isArray,
                isEscaped,
                isObject,
                isObjectField,
                isObjectValue,
                isString,
                isJSONType
            } = currentGuess

            /**
             * @type {String}    The substring _after_ the single-quote.
             */
            const followingString = misformattedJSON.slice(stringIndex + 1)

            /**
             * @type {String}    The substring _before_ the single-quote.
             */
            const precedingString = misformattedJSON.slice(0, stringIndex)

            // change parser state for delimiters
            if (character !== "'") {
                // keep character
                currentGuess.string += character

                // set escape sequence, only for inside of a JSON string
                if (isString) {
                    // escape character found,
                    // if another escape character preceded this one,
                    // the following character is not part of an escape sequence
                    // otherwise, the following character is part of an escape sequence
                    if (character === "\\") currentGuess.isEscaped = !isEscaped

                    // if isEscaped is false, loop to possible end of string
                    // if isEscaped is true, ignore escaped single-quote character later
                    // ignore delimiter characters inside of a JSON string,
                    // since they do not overlap with escape sequence
                    continue
                }

                // set if in an object field and increase object nesting
                if (character === "{") {
                    // set if in an object field
                    currentGuess.isObjectField = true
                    currentGuess.isJSONType = "field"

                    // increase object nesting
                    currentGuess.isObject++
                }
                // unset in object field on delimiter and set in object value
                else if (character === ":") {
                    // unset object field on delimiter
                    currentGuess.isObjectField = false
                    currentGuess.isJSONType = "object-value"

                    // set in object value
                    currentGuess.isObjectValue = true
                }
                // unset in object value on delimiter and decrease object nesting
                else if (character === "}") {
                    // unset in object value on delimiter
                    currentGuess.isObjectValue = false

                    // decrease object nesting
                    currentGuess.isObject--

                    currentGuess.isJSONType =
                        // if this is nested in a root object,
                        !isArray && isObject
                            ? "object-value"
                            : // if this is nested in a root array,
                            !isObject && isArray
                            ? "array"
                            : // default JSON value type
                            isArray && isObject
                            ? "value"
                            : // end of JSON
                              undefined
                }
                // increase array nesting
                else if (character === "[") {
                    currentGuess.isArray++
                    currentGuess.isJSONType = "array"
                }
                // decrease array nesting
                else if (character === "]") {
                    currentGuess.isArray--

                    currentGuess.isJSONType =
                        // if this is nested in a root array,
                        !isObject && isArray
                            ? "array"
                            : // if this is nested in a root object,
                            !isArray && isObject
                            ? "object-value"
                            : // default JSON value type
                            isArray && isObject
                            ? "value"
                            : // end of JSON
                              undefined
                }
                // only for objects, not array in object, reset field and unset value
                else if (
                    isObjectValue &&
                    isJSONType === "object-value" &&
                    character === ","
                ) {
                    // last value ended in last object entry
                    currentGuess.isObjectValue = false

                    // new field started in next object entry
                    currentGuess.isObjectField = true
                    currentGuess.isJSONType = "field"
                }

                // only attempt to reformat single-quotes
                continue
            }

            // try all possible solutions by generating
            // all possible solutions by brute-force
            if (
                bruteForce?.({
                    // make copy to prevent mutations
                    currentGuess: { ...currentGuess },
                    followingString,
                    precedingString,
                    stringIndex,
                    characterIndex
                })
            ) {
                // create a new guess
                guesses.push({
                    ...currentGuess,
                    // try to make a valid JSON string
                    // by keeping this single-quote,
                    string: currentGuess.string + character

                    // // possibly change these to allow for different heuristics
                    // isString: currentGuess.isString,
                    // isEscaped: currentGuess.isEscaped,
                    // isArray: currentGuess.isArray,
                    // isObject: currentGuess.isObject
                    // isObjectField: currentGuess.isObjectField,
                    // isObjectValue: currentGuess.isObjectValue,
                })

                // try to make a valid JSON string
                // by replacing this single-quote with a double-quote
                //! must come after new guess creation
                currentGuess.string += '"'

                // // possibly change these to allow for different heuristics
                // currentGuess.isString = currentGuess.isString
                // currentGuess.isEscaped = currentGuess.isEscaped
                // currentGuess.isArray = currentGuess.isArray
                // currentGuess.isObject = currentGuess.isObject
                // currentGuess.isObjectField = currentGuess.isObjectField
                // currentGuess.isObjectValue = currentGuess.isObjectValue
            }
            // use user given heuristics for for how to replace single-quote,
            // or change guess parsing state
            else if (
                heuristic?.({
                    // give current parser guess and state info to heuristic
                    currentGuess,
                    followingString,
                    precedingString,
                    stringIndex,
                    characterIndex
                })
            ) {
                /* do nothing... `heuristic` modified object reference directly */
            }
            // use default heuristics
            else if (isString) {
                // skip if quote is escaped and clearly inside of a string
                if (isEscaped) {
                    // escape sequence finished
                    currentGuess.isEscaped = false

                    // add normal quote character back to string
                    currentGuess.string += character

                    // loop to next character
                    continue
                }

                /**
                 * @type {String}   JSON object, value, or array ending delimiters.
                 */
                let possibleDelimiters = ""

                // add contextual delimiters for use in heuristics

                // delimiter for ending an array,
                if (isJSONType === "array") possibleDelimiters = ",\\]"
                // delimiter for ending an object,
                else if (isJSONType === "object-value") possibleDelimiters = ",}"
                // delimiter for ending an object field
                else if (isJSONType === "field" || isObjectField)
                    possibleDelimiters = ":"
                // delimiter for ending a value
                else if (isJSONType === "value") possibleDelimiters = ",}\\]"

                /**
                 * @type {Boolean} This single-quote is followed by a JSON type
                 *                 delimiter, and likely should be a double-quote.
                 */
                const heuristicDelimiterFollowing =
                    !!possibleDelimiters &&
                    new RegExp(String.raw`^\s*[${possibleDelimiters}]`).test(
                        followingString
                    )

                /**
                 * @type {RegExpExecArray|null} Finds a different possible solution.
                 *                 Starting from the current character, and not the
                 *                 `followingString`, so the RegExp includes it in the
                 *                 results array, leaving the capturing group with just
                 *                 the alternate possible and validated solution.
                 */
                const heuristicFindValids = new RegExp(
                    String.raw`([^']*)'\s*[${possibleDelimiters}]`
                ).exec(misformattedJSON.slice(stringIndex))

                /**
                 * @type {(String|"")} The RegExp validated string capturing group of
                 *                 just the characters before the single-quote to
                 *                 replace in the RexExp auto-filled guess. Skip if
                 *                 empty string, or capturing group is empty string.
                 */
                const regexpCapturingGroup = heuristicFindValids
                    ? heuristicFindValids[1]
                    : ""

                // both this single-quote and a following single-quote
                // have potentially correct resolutions, making the solution ambiguous,
                // so create a new guess to try both solutions
                if (regexpCapturingGroup) {
                    // only the following single-quote RegExp heuristic passed,
                    // which likely means this is a string character that should be kept,
                    // so use RegEpx auto-fill solution

                    // this guess will replace the single-quote and end the string
                    guesses.push({
                        ...currentGuess,
                        isString: false,
                        string: currentGuess.string + '"'
                    })

                    if (TRY_HARD)
                        guesses.push({
                            ...currentGuess,
                            isString: true, // stay string
                            string: currentGuess.string + character
                        })

                    // keep single-quote and use RegExp solution of all characters before
                    // single-quote from RegExp search that needs to be replaced
                    currentGuess.string += character + regexpCapturingGroup + '"'

                    // the length of the entire RegExp guess string
                    // including ending double-quote
                    currentGuess.aufoFilled = regexpCapturingGroup.length + 1

                    // ended string with double-quote
                    currentGuess.isString = false
                }

                // only the current single-quote RegExp heuristic passed,
                // which likely means this is a misformatted string delimiter
                else if (heuristicDelimiterFollowing) {
                    // WORSE time-complexity mode, custom heuristics but with brute-force
                    if (TRY_HARD)
                        guesses.push({
                            ...currentGuess,
                            isString: false,
                            string: currentGuess.string + character
                        })

                    // replace current misformatted single-quote with a double-quote
                    currentGuess.string += '"'

                    // ended string with double-quote
                    currentGuess.isString = false
                }

                // neither RegExp heuristic passed,
                // which likely means this is a string character that should be kept
                else {
                    // WORSE time-complexity mode, custom heuristics but with brute-force
                    if (TRY_HARD)
                        guesses.push({
                            ...currentGuess,
                            isString: false, // end string
                            string: currentGuess.string + character
                        })

                    // keep single-quote
                    currentGuess.string += character
                }
            }
            // beginning of a JSON string, reformat single-quote
            else {
                // replace single-quote with double-quote
                currentGuess.string += '"'

                // parser now looking for ending single-quote that needs reformatting
                currentGuess.isString = true
            }
        }
    }

    // try all parsing guesses to see if one works
    /**
     * @type   {Number}      Index of guess for debugging information.
     */
    let guessIndex = 0

    /**
     * @type   {String[]}    Array of every valid JSON string reformatted.
     */
    const successes = []

    for (const guess of guesses) {
        try {
            JSON.parse(guess.string)

            // reformatting guess parsed as valid JSON!
            successes.push(guess.string)

            console.log(`successfully parsed #${guessIndex}:`, guess, successes)
        } catch (error) {
            // // catch JSON parsing error and output for debug
            // console.error(`failed: guess #${guessIndex}:`, guess)
        }

        guessIndex++
    }

    if (successes.length === 1)
        console.log("Parser found definitive answer!\nParsed:", successes[0])
    else if (successes.length > 1)
        console.log(
            "Parser found no definitive answer! Parser found ambiguous answers! Try setting `opts.heuristic` or `opts.bruteForce`, they can get better parsing!\nParsed:",
            successes
        )
    else
        console.error(
            "Parser Failed to parse any reformatting guess as a valid JSON string! Try setting `heuristic`, `TRY_HARD`, or `opts.bruteForce` (if necessary), they can get better parsing!"
        )

    // return all valid JSON string guesses
    return successes
}

const json1 = `['Bob O'Rielly']`
const json2 = `['Mr. O'McDonald, height 13',1\\"']`
const json3 = `[{'fullName':'Bob O'Rielly','height':'13',5\\"'}]`
const json4 = `[[''''''''''''],[[''''''''],'[]','{}',',',':'],'''''''''''''']`
const json5 = `[{'techid':'0128','daPoints':3,'speedingPoints':3,'fleetInspectionPoints':3,'lofPoints':3,'missedTrgModules':null,'fullName':'MANPREET SINGH','safetyInspectPoints':3,'missedTrgPoints':3,'speeding_qty':null,'safetyTotalPoints':21,'atFaultPoints':3,'atFaultAccident':null,'region':'PYEM','supervisor':'AGHATOR OSA','driverAlert':null,'status':'A'}]`
const json6 = `[{'fullName':'Rob O'Rielly','height':'70.5\\"'}]`
const json7 = `[{'fullName':'Dob MacRielly','height':'13',5\\"'}]`

console.log(`ANSWERS 1:`, preParse(json1))
console.log(`ANSWERS 2:`, preParse(json2, undefined, undefined, true))
console.log(`ANSWERS 3:`, preParse(json3, undefined, undefined, true))
console.log(`ANSWER 4:`, preParse(json4))
console.log(`ANSWER 5:`, preParse(json5))
console.log(
    `ANSWER 6:`,
    preParse(json6, () => true, undefined)
)
console.log(`ANSWER 7:`, preParse(json7, undefined, undefined, true))