4 Replies Latest reply on Oct 29, 2015 8:32 AM by williamadowling

    Convert string (string of JSON) to JSON object?

    williamadowling Level 4


      I finally figured out how to use #include instead of file.read();. This solves my immediate problem. However I am still curious as to whether it's possible to do what I'm asking for below, just in case there comes a situation where for whatever reason I cannot simply use #include. Thanks everyone. =)



      **EDIT 2**

      Anyone know how to use #include for a file whose name is determined during script execution?

      For example.. the variable orderNumber is generated by a prompt window (lets say the result is 1234567). the file i want to include will be named "1234567.js).

      What I want to do is something like:

      #include "~/Desktop/Info Folder/" + orderNumber + ".js"

      (then I want to assign a variable to the result somehow, since it's simply an anonymous object at this point and i don't know how to access it's contents);

      **EDIT 2**


      Hey all. I have a (most likely really stupid) question about how to take a string that contains the JSON text and simply change it's type from "string" to "object"... I'm probably wording this very badly.


      I'm fetching a .js file from my local network and setting a variable to the result of file.read();


      The contents of the file is an anonymous object in JSON. However, when i use file.read(); the object is brought in as a string, like this:


      '{"roster":[{"name":"Fink","number":"19","jerseySize":"XL","qty":"1","topId":"78531"},{thi s is the next player},{this is the next player}]}'


      That is a massively simplified version of what i'm actually reading, but you get the point. I want to be able to bring that object into the script that I'm running and create new objects based on the pertinent information (in this case i only need the values for "name", "number", and "jerseySize").


      So my question is this. how do i turn the above string of JSON into:


      var roster = [






           next player



           next player




      ???? A google search reveals the method JSON.parse(text). But that is not supported in ESTK.

        • 2. Re: Convert string (string of JSON) to JSON object?
          Upendra_sengar Level 2

          I'm using this code for JSON operation.




          Example --


          var obj  = JSON.parse(str); // returns an object from string

          var str = JSON.stringify(obj) // returns string from object






          Public Domain.
          See http://www.JSON.org/js.html
          This code should be minified before deployment.
          See http://javascript.crockford.com/jsmin.html
          NOT CONTROL.
          This file creates a global JSON object containing two methods: stringify
          and parse.
          JSON.stringify(value, replacer, space)
          value any JavaScript value, usually an object or array.
          replacer an optional parameter that determines how object
          values are stringified for objects. It can be a
          function or an array of strings.
          space an optional parameter that specifies the indentation
          of nested structures. If it is omitted, the text will
          be packed without extra whitespace. If it is a number,
          it will specify the number of spaces to indent at each
          level. If it is a string (such as '\t' or ' '),
          it contains the characters used to indent at each level.
          This method produces a JSON text from a JavaScript value.
          When an object value is found, if the object contains a toJSON
          method, its toJSON method will be called and the result will be
          stringified. A toJSON method does not serialize: it returns the
          value represented by the name/value pair that should be serialized,
          or undefined if nothing should be serialized. The toJSON method
          will be passed the key associated with the value, and this will be
          bound to the value
          For example, this would serialize Dates as ISO strings.
          Date.prototype.toJSON = function (key) {
          function f(n) {
          // Format integers to have at least two digits.
          return n < 10 ? '0' + n : n;
          return this.getUTCFullYear() + '-' +
          f(this.getUTCMonth() + 1) + '-' +
          f(this.getUTCDate()) + 'T' +
          f(this.getUTCHours()) + ':' +
          f(this.getUTCMinutes()) + ':' +
          f(this.getUTCSeconds()) + 'Z';
          You can provide an optional replacer method. It will be passed the
          key and value of each member, with this bound to the containing
          object. The value that is returned from your method will be
          serialized. If your method returns undefined, then the member will
          be excluded from the serialization.
          If the replacer parameter is an array of strings, then it will be
          used to select the members to be serialized. It filters the results
          such that only members with keys listed in the replacer array are
          Values that do not have JSON representations, such as undefined or
          functions, will not be serialized. Such values in objects will be
          dropped; in arrays they will be replaced with null. You can use
          a replacer function to replace those with JSON values.
          JSON.stringify(undefined) returns undefined.
          The optional space parameter produces a stringification of the
          value that is filled with line breaks and indentation to make it
          easier to read.
          If the space parameter is a non-empty string, then that string will
          be used for indentation. If the space parameter is a number, then
          the indentation will be that many spaces.
          text = JSON.stringify(['e', {pluribus: 'unum'}]);
          // text is '["e",{"pluribus":"unum"}]'
          text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
          // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
          text = JSON.stringify([new Date()], function (key, value) {
          return this[key] instanceof Date ?
          'Date(' + this[key] + ')' : value;
          // text is '["Date(---current time---)"]'
          JSON.parse(text, reviver)
          This method parses a JSON text to produce an object or array.
          It can throw a SyntaxError exception.
          The optional reviver parameter is a function that can filter and
          transform the results. It receives each of the keys and values,
          and its return value is used instead of the original value.
          If it returns what it received, then the structure is not modified.
          If it returns undefined then the member is deleted.
          // Parse the text. Values that look like ISO date strings will
          // be converted to Date objects.
          myData = JSON.parse(text, function (key, value) {
          var a;
          if (typeof value === 'string') {
          a =
          if (a) {
          return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
          +a[5], +a[6]));
          return value;
          myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
          var d;
          if (typeof value === 'string' &&
          value.slice(0, 5) === 'Date(' &&
          value.slice(-1) === ')') {
          d = new Date(value.slice(5, -1));
          if (d) {
          return d;
          return value;
          This is a reference implementation. You are free to copy, modify, or
          /*jslint evil: true, regexp: true */
          /*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
          call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
          getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
          lastIndex, length, parse, prototype, push, replace, slice, stringify,
          test, toJSON, toString, valueOf
          // Create a JSON object only if one does not already exist. We create the
          // methods in a closure to avoid creating global variables.
          if (typeof JSON !== 'object') {
          JSON = {};
          (function () {
          'use strict';
          function f(n) {
          // Format integers to have at least two digits.
          return n < 10 ? '0' + n : n;
          if (typeof Date.prototype.toJSON !== 'function') {
          Date.prototype.toJSON = function () {
          return isFinite(this.valueOf())
          ? this.getUTCFullYear() + '-' +
          f(this.getUTCMonth() + 1) + '-' +
          f(this.getUTCDate()) + 'T' +
          f(this.getUTCHours()) + ':' +
          f(this.getUTCMinutes()) + ':' +
          f(this.getUTCSeconds()) + 'Z'
          : null;
          String.prototype.toJSON =
          Number.prototype.toJSON =
          Boolean.prototype.toJSON = function () {
          return this.valueOf();
          var cx,
          function quote(string) {
          // If the string contains no control characters, no quote characters, and no
          // backslash characters, then we can safely slap some quotes around it.
          // Otherwise we must also replace the offending characters with safe escape
          // sequences.
          escapable.lastIndex = 0;
          return escapable.test(string) ? '"' + string.replace(escapable, function (a) {
          var c = meta[a];
          return typeof c === 'string'
          ? c
          : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
          }) + '"' : '"' + string + '"';
          function str(key, holder) {
          // Produce a string from holder[key].
          var i, // The loop counter.
          k, // The member key.
          v, // The member value.
          mind = gap,
          value = holder[key];
          // If the value has a toJSON method, call it to obtain a replacement value.
          if (value && typeof value === 'object' &&
          typeof value.toJSON === 'function') {
          value = value.toJSON(key);
          // If we were called with a replacer function, then call the replacer to
          // obtain a replacement value.
          if (typeof rep === 'function') {
          value = rep.call(holder, key, value);
          // What happens next depends on the value's type.
          switch (typeof value) {
          case 'string':
          return quote(value);
          case 'number':
          // JSON numbers must be finite. Encode non-finite numbers as null.
          return isFinite(value) ? String(value) : 'null';
          case 'boolean':
          case 'null':
          // If the value is a boolean or null, convert it to a string. Note:
          // typeof null does not produce 'null'. The case is included here in
          // the remote chance that this gets fixed someday.
          return String(value);
          // If the type is 'object', we might be dealing with an object or an array or
          // null.
          case 'object':
          // Due to a specification blunder in ECMAScript, typeof null is 'object',
          // so watch out for that case.
          if (!value) {
          return 'null';
          // Make an array to hold the partial results of stringifying this object value.
          gap += indent;
          partial = [];
          // Is the value an array?
          if (Object.prototype.toString.apply(value) === '[object Array]') {
          // The value is an array. Stringify every element. Use null as a placeholder
          // for non-JSON values.
          length = value.length;
          for (i = 0; i < length; i += 1) {
          partial[i] = str(i, value) || 'null';
          // Join all of the elements together, separated with commas, and wrap them in
          // brackets.
          v = partial.length === 0
          ? '[]'
          : gap
          ? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']'
          : '[' + partial.join(',') + ']';
          gap = mind;
          return v;
          // If the replacer is an array, use it to select the members to be stringified.
          if (rep && typeof rep === 'object') {
          length = rep.length;
          for (i = 0; i < length; i += 1) {
          if (typeof rep[i] === 'string') {
          k = rep[i];
          v = str(k, value);
          if (v) {
          partial.push(quote(k) + (gap ? ': ' : ':') + v);
          } else {
          // Otherwise, iterate through all of the keys in the object.
          for (k in value) {
          if (Object.prototype.hasOwnProperty.call(value, k)) {
          v = str(k, value);
          if (v) {
          partial.push(quote(k) + (gap ? ': ' : ':') + v);
          // Join all of the member texts together, separated with commas,
          // and wrap them in braces.
          v = partial.length === 0
          ? '{}'
          : gap
          ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}'
          : '{' + partial.join(',') + '}';
          gap = mind;
          return v;
          // If the JSON object does not yet have a stringify method, give it one.
          if (typeof JSON.stringify !== 'function') {
          escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
          meta = { // table of character substitutions
          '\b': '\\b',
          '\t': '\\t',
          '\n': '\\n',
          '\f': '\\f',
          '\r': '\\r',
          '"' : '\\"',
          '\\': '\\\\'
          JSON.stringify = function (value, replacer, space) {
          // The stringify method takes a value and an optional replacer, and an optional
          // space parameter, and returns a JSON text. The replacer can be a function
          // that can replace values, or an array of strings that will select the keys.
          // A default replacer method can be provided. Use of the space parameter can
          // produce text that is more easily readable.
          var i;
          gap = '';
          indent = '';
          // If the space parameter is a number, make an indent string containing that
          // many spaces.
          if (typeof space === 'number') {
          for (i = 0; i < space; i += 1) {
          indent += ' ';
          // If the space parameter is a string, it will be used as the indent string.
          } else if (typeof space === 'string') {
          indent = space;
          // If there is a replacer, it must be a function or an array.
          // Otherwise, throw an error.
          rep = replacer;
          if (replacer && typeof replacer !== 'function' &&
          (typeof replacer !== 'object' ||
          typeof replacer.length !== 'number')) {
          throw new Error('JSON.stringify');
          // Make a fake root object containing our value under the key of ''.
          // Return the result of stringifying the value.
          return str('', {'': value});
          // If the JSON object does not yet have a parse method, give it one.
          if (typeof JSON.parse !== 'function') {
          cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
          JSON.parse = function (text, reviver) {
          // The parse method takes a text and an optional reviver function, and returns
          // a JavaScript value if the text is a valid JSON text.
          var j;
          function walk(holder, key) {
          // The walk method is used to recursively walk the resulting structure so
          // that modifications can be made.
          var k, v, value = holder[key];
          if (value && typeof value === 'object') {
          for (k in value) {
          if (Object.prototype.hasOwnProperty.call(value, k)) {
          v = walk(value, k);
          if (v !== undefined) {
          value[k] = v;
          } else {
          delete value[k];
          return reviver.call(holder, key, value);
          // Parsing happens in four stages. In the first stage, we replace certain
          // Unicode characters with escape sequences. JavaScript handles many characters
          // incorrectly, either silently deleting them, or treating them as line endings.
          text = String(text);
          cx.lastIndex = 0;
          if (cx.test(text)) {
          text = text.replace(cx, function (a) {
          return '\\u' +
          ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
          // In the second stage, we run the text against regular expressions that look
          // for non-JSON patterns. We are especially concerned with '()' and 'new'
          // because they can cause invocation, and '=' because it can cause mutation.
          // But just to be safe, we want to reject all unexpected forms.
          // We split the second stage into 4 regexp operations in order to work around
          // crippling inefficiencies in IE's and Safari's regexp engines. First we
          // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
          // replace all simple value tokens with ']' characters. Third, we delete all
          // open brackets that follow a colon or comma or that begin the text. Finally,
          // we look to see that the remaining characters are only whitespace or ']' or
          // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
          if (/^[\],:{}\s]*$/
          .test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
          .replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']')
          .replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
          // In the third stage we use the eval function to compile the text into a
          // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
          // in JavaScript: it can begin a block or an object literal. We wrap the text
          // in parens to eliminate the ambiguity.
          j = eval('(' + text + ')');
          // In the optional fourth stage, we recursively walk the new structure, passing
          // each name/value pair to a reviver function for possible transformation.
          return typeof reviver === 'function'
          ? walk({'': j}, '')
          : j;
          // If the text is not JSON parseable, then a SyntaxError is thrown.
          throw new SyntaxError('JSON.parse');
          • 3. Re: Convert string (string of JSON) to JSON object?
            CarlosCanto Adobe Community Professional & MVP

            for simple objects like the example, you could use evil eval(), get rid of "roster" first


            var str = '[{"name":"Fink","number":"19","jerseySize":"XL","qty":"1","topId":"78531"},{"name":"Fink ","number":"19","jerseySize":"XL","qty":"1","topId":"78531"}]'



            var roster = eval(str);




            • 4. Re: Convert string (string of JSON) to JSON object?
              williamadowling Level 4

              Awesome. thanks carlos. I was having a hell of a time figuring out how to use eval.. And it didn't help that every time i try to look up the answer all i get is "DON'T USE EVAL!". Which makes sense in a web context, but for local, in-house scripts run on the artist's machine.. all day.


              Thanks, again!