Node.js中如何将文本文件转换为JavaScript数组？

Hey there! The problem here is that your myJson.txt file doesn’t contain valid JSON—it’s just a sequence of separate JSON objects stuck together without proper array formatting. Let’s fix that and get your code working.

Step 1: Understand the Input Problem #

Your file content looks like this:

{"action": "key press", "timestamp": 1523783621, "user": "neovim"} {"action": "unlike", "timestamp": 1523784584, "user": "r00k"} {"action": "touch", "timestamp": 1523784963, "user": "eevee"} {"action": "report as spam", "timestamp": 1523786005, "user": "moxie"}

This isn’t a valid JSON array because:

• It’s not wrapped in square brackets []
• Individual objects are separated by spaces instead of commas ,

Step 2: Working Code Solution #

Here’s a complete function that reads the file, fixes the JSON format, and parses it into a valid JavaScript array:

const fs = require('fs');

function convert(input_file_path) {
  try {
    // Read the raw file content
    const fileContent = fs.readFileSync(input_file_path, 'utf8');
    
    // Transform the invalid JSON into a valid array:
    // 1. Replace "} {" (with any whitespace in between) with "}, {"
    // 2. Wrap the entire string in square brackets
    const validJson = `[${fileContent.replace(/}\s*{/g, '}, {')}]`;
    
    // Parse into a JavaScript array of objects
    const dataArray = JSON.parse(validJson);
    
    return dataArray;
  } catch (error) {
    console.error('Something went wrong:', error.message);
    return null;
  }
}

// Example usage
const convertedArray = convert('./myJson.txt');
if (convertedArray) {
  console.log('Success! Your array:', convertedArray);
}

How This Works: #

• Reading the File: We use fs.readFileSync for simplicity (swap to fs.readFile with a callback if you need async behavior).
• Fixing the JSON: The regex /\}\s*\{\/g finds every instance of } followed by any whitespace (spaces, newlines, tabs) and {, replacing it with }, { to properly separate objects. Wrapping the whole string in [] turns it into a valid JSON array.
• Parsing: JSON.parse converts the corrected JSON string into a usable JavaScript array.
• Error Handling: The try/catch block catches common issues like missing files or malformed JSON (even after our fix) and logs a clear message.

内容的提问来源于stack exchange，提问作者Viet Le