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Incomplete JSON pretty printer
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| <!-- Taken from https://simonwillison.net/2025/Mar/28/incomplete-json-pretty-printer/ --> | |
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>JSON Pretty Printer</title> | |
| <style> | |
| body { | |
| font-family: Arial, sans-serif; | |
| margin: 20px; | |
| background-color: #f7f7f7; | |
| } | |
| textarea { | |
| width: 100%; | |
| height: 200px; | |
| font-family: monospace; | |
| font-size: 14px; | |
| } | |
| pre { | |
| background: #fff; | |
| padding: 10px; | |
| border: 1px solid #ddd; | |
| border-radius: 4px; | |
| white-space: pre-wrap; | |
| word-wrap: break-word; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h2>JSON Pretty Printer</h2> | |
| <textarea id="inputJson" placeholder="Paste incomplete JSON here..."></textarea> | |
| <br> | |
| <button onclick="prettyPrintJson()">Pretty Print JSON</button> | |
| <h3>Formatted JSON:</h3> | |
| <pre id="outputJson"></pre> | |
| <script> | |
| function prettyPrintJson() { | |
| const input = document.getElementById('inputJson').value; | |
| const formattedJson = prettyFormat(input); | |
| document.getElementById('outputJson').textContent = formattedJson; | |
| } | |
| function prettyFormat(jsonString) { | |
| let result = ''; | |
| let indent = 0; | |
| let inString = false; | |
| const indentStep = 2; | |
| for (let i = 0; i < jsonString.length; i++) { | |
| const char = jsonString[i]; | |
| const prevChar = i > 0 ? jsonString[i - 1] : ''; | |
| if (char === '"' && prevChar !== '\\') { | |
| inString = !inString; | |
| result += char; | |
| } else if (!inString && (char === '{' || char === '[')) { | |
| indent += indentStep; | |
| result += char + '\n' + ' '.repeat(indent); | |
| } else if (!inString && (char === '}' || char === ']')) { | |
| indent -= indentStep; | |
| result += '\n' + ' '.repeat(indent) + char; | |
| } else if (!inString && char === ',') { | |
| result += char + '\n' + ' '.repeat(indent); | |
| } else { | |
| result += char; | |
| } | |
| } | |
| return result; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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