Hey there! I totally get how frustrating it is when you hit a syntax error that your linter misses, especially after you’ve already reinstalled dependencies and double-checked code. Let’s walk through how to track down that missing parenthesis on line 55.

Here are actionable steps to fix this: #

• Zero in on line 55 (and the lines around it)
  The error says the missing ) is on line 55, but often the root cause is a mismatched bracket, unclosed string, or incomplete object literal in the lines right before it. For example:

  • An unclosed object like const options = { url: URL_SEED, method: 'GET' (missing the closing }) will throw off the entire argument list of the next function call.
  • A string with unescaped quotes, like let message = 'It's a link', breaks syntax and can cause the parser to misread subsequent code.

• Use Node’s built-in syntax checker
  SublimeLinter might be missing the issue due to configuration quirks. Run this command in your terminal—it’ll give you a precise, reliable syntax check:

  node --check index.js
  

  This will point directly to the exact spot where the parser gets confused, even if it’s not the line the initial error mentions.

• Check function calls and callback nesting
  Since you’re using modules like request and cheerio, it’s easy to mess up nested callbacks. For example, forgetting to close a callback’s curly brace or parenthesis:

  // Wrong: Missing closing }) for the fs.appendFile callback
  request(URL_SEED, (err, res, body) => {
    const $ = cheerio.load(body);
    $('a').each((i, el) => {
      fs.appendFile('links.txt', $(el).attr('href') + '\n', (err) => {
        if (err) console.error(err);
      // Oops, no }); here
    });
  });
  

  This kind of nesting mistake often triggers the "missing )" error because the parser can’t properly parse the argument list of the outer function.

• Comment out code to narrow the issue
  If you’re still stuck, comment out chunks of code starting from line 55 and working backwards. Run node index.js after each comment—when the error disappears, you’ve found the problematic code block. Then you can uncomment line by line to pinpoint the exact mistake.

Quick recap #

Focus on matching all parentheses, curly braces, and quotes in line 55 and its surrounding code. Use node --check to bypass any linter blind spots, and don’t overlook nested callbacks—they’re a common culprit for this error.

内容的提问来源于stack exchange，提问作者nanquim