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Fix unbalanced parentheses in JSX

Repair broken return trees and callback expressions caused by missing or extra parentheses.

syntaxjsxparser-error

Symptoms

  • • Babel or parser errors appear after adding conditions, maps, or wrappers.
  • • Preview fails even though braces seem balanced.

Root cause

A wrapper expression like return (...), function call, or ternary branch has mismatched parentheses.

Fix steps

  1. 1. Locate the nearest return block and verify it opens and closes once.
  2. 2. Check map/filter callbacks for missing ")" before JSX closing tags.
  3. 3. Normalize nested ternaries by splitting into intermediate variables if needed.

Prevent it next time

  • • Prefer early returns and extracted constants over deeply nested inline expressions.