A simple JS to (compact) JSON converter. Made with ❤️ for @kanitw. Available at bit.ly/js2json.
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JS to JSON
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { margin:0; font-family: sans-serif} | |
| h2 {margin: 0} | |
| .wrapper {display: flex; flex-direction: row; justify-content: space-between; } | |
| .wrapper div {flex: 1;} | |
| .wrapper div:last-child {padding-left: 20px} | |
| #error {color: firebrick} | |
| textarea {height: 400px; width: 99%} | |
| </style> | |
| </head> | |
| <body> | |
| <div class="wrapper"> | |
| <div> | |
| <h2>JS:</h2><br> | |
| <textarea id="in">{ | |
| hello: 42, | |
| world: 1+2, | |
| data: { | |
| a: [1,2,3,4,5], | |
| b: [6,7,8,9,10], | |
| c: [11,12,13,14,15], | |
| d: [16,17,17,19,20] | |
| }, | |
| awesome: true | |
| } | |
| </textarea> | |
| </div> | |
| <div> | |
| <h2>JSON:</h2><br> | |
| <textarea id="out"></textarea> | |
| </div> | |
| </div> | |
| <p id="error"></p> | |
| <script src="stringify.js"></script> | |
| <script> | |
| const input = document.getElementById("in"); | |
| const output = document.getElementById("out"); | |
| const error = document.getElementById("error"); | |
| function run(){ | |
| try { | |
| const json = stringify(eval('x=' + input.value)); | |
| output.value = json; | |
| error.innerText = ""; | |
| } catch (err) { | |
| error.innerText = err.toString(); | |
| output.value = ""; | |
| } | |
| } | |
| window.onload = function() { | |
| input.addEventListener('input', run); | |
| run(); | |
| }; | |
| </script> | |
| </body> |
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| // from json-stringify-pretty-compact | |
| function stringify (obj, options) { | |
| options = options || {} | |
| var indent = JSON.stringify([1], null, get(options, 'indent', 2)).slice(2, -3) | |
| var addMargin = get(options, 'margins', false) | |
| var maxLength = (indent === '' ? Infinity : get(options, 'maxLength', 80)) | |
| return (function _stringify (obj, currentIndent, reserved) { | |
| if (obj && typeof obj.toJSON === 'function') { | |
| obj = obj.toJSON() | |
| } | |
| var string = JSON.stringify(obj) | |
| if (string === undefined) { | |
| return string | |
| } | |
| var length = maxLength - currentIndent.length - reserved | |
| if (string.length <= length) { | |
| var prettified = prettify(string, addMargin) | |
| if (prettified.length <= length) { | |
| return prettified | |
| } | |
| } | |
| if (typeof obj === 'object' && obj !== null) { | |
| var nextIndent = currentIndent + indent | |
| var items = [] | |
| var delimiters | |
| var comma = function (array, index) { | |
| return (index === array.length - 1 ? 0 : 1) | |
| } | |
| if (Array.isArray(obj)) { | |
| for (var index = 0; index < obj.length; index++) { | |
| items.push( | |
| _stringify(obj[index], nextIndent, comma(obj, index)) || 'null' | |
| ) | |
| } | |
| delimiters = '[]' | |
| } else { | |
| Object.keys(obj).forEach(function (key, index, array) { | |
| var keyPart = JSON.stringify(key) + ': ' | |
| var value = _stringify(obj[key], nextIndent, | |
| keyPart.length + comma(array, index)) | |
| if (value !== undefined) { | |
| items.push(keyPart + value) | |
| } | |
| }) | |
| delimiters = '{}' | |
| } | |
| if (items.length > 0) { | |
| return [ | |
| delimiters[0], | |
| indent + items.join(',\n' + nextIndent), | |
| delimiters[1] | |
| ].join('\n' + currentIndent) | |
| } | |
| } | |
| return string | |
| }(obj, '', 0)) | |
| } | |
| // Note: This regex matches even invalid JSON strings, but since we’re | |
| // working on the output of `JSON.stringify` we know that only valid strings | |
| // are present (unless the user supplied a weird `options.indent` but in | |
| // that case we don’t care since the output would be invalid anyway). | |
| var stringOrChar = /("(?:[^\\"]|\\.)*")|[:,\][}{]/g | |
| function prettify (string, addMargin) { | |
| var m = addMargin ? ' ' : '' | |
| var tokens = { | |
| '{': '{' + m, | |
| '[': '[' + m, | |
| '}': m + '}', | |
| ']': m + ']', | |
| ',': ', ', | |
| ':': ': ' | |
| } | |
| return string.replace(stringOrChar, function (match, string) { | |
| return string ? match : tokens[match] | |
| }) | |
| } | |
| function get (options, name, defaultValue) { | |
| return (name in options ? options[name] : defaultValue) | |
| } |
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