CODEWITHSUNDEEP
javascriptbracketsmismatchunexpectendoffile
Chris Tolworthy
Chris Tolworthy

Reputation: 2096

Mismatched parentheses: a quick way to find them?

I just rearranged a very large JavaScript file. I now get "Unexpected end of input." Somewhere in those hundred of functions, one has lost (or gained) a bracket. What's the quickest way to find it?

Upvotes: 18

Views: 48339

Answers (4)

mareoraft
mareoraft

Reputation: 3902

Try the Esprima parser. It comes with a syntax validator that will give you the line number of each error.

npm install --global esprima
esvalidate path/to/file.js

outputs

path/to/file.js:915: Unexpected token )

Upvotes: 0

CESDewar
CESDewar

Reputation: 61

A good trick when missing a brace in eclipse is to go to the final brace in the source module and double-click it. That will highlight all the way back to what it THINKS is the matching open brace. Where it highlights back to is invariably the START of where the problem is, so skip that open brace and go to the next one and start double-clicking open braces and you will usually find where the brace is missing pretty quickly. I learnt that the hard way with a source code file of 20,000+ lines of code and getting hundreds of errors without the slightest indication as where the real problem was as the errors started appearing thousands of lines earlier in the code.

Upvotes: 6

Steve Wellens
Steve Wellens

Reputation: 20620

Minimize the nesting of functions. It reduces the quality of the code (maintainability-wise).

Upvotes: -1

Dave Newton
Dave Newton

Reputation: 160201

Re-format the file using something that indents well. Look for something that's too far to the left.

Upvotes: 2

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