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String appears where not expected due to missing operators, wrong quotes, or syntax errors. Check for missing commas, operators, or proper string concatenation.

Array length is invalid (negative or too large). Validate array length values, use proper array creation methods, and handle dynamic length calculations safely.

Infinite recursion or too many nested function calls. Add base cases to recursive functions, check for circular references, and limit recursion depth.

Use async function declaration and await keyword for promises. Wrap in try-catch for error handling. Async functions always return promises.

Create promises with new Promise((resolve, reject) => {}). Use resolve() for success and reject() for errors. Chain with .then() and .catch().

Use JSON.parse() to convert JSON strings to objects. Always wrap in try-catch for error handling. Use JSON.stringify() for the reverse operation.

Fix missing parentheses errors: check function calls, match opening/closing parentheses, and validate argument syntax.

Fix URI malformed errors: validate URI strings, handle encoding/decoding properly, and sanitize user input.

Fix "not a function" errors: verify function references, check variable assignments, and understand function scope.

Diagnose and fix unexpected token syntax errors.

Fix TypeError when accessing properties of undefined/null.

Value is not iterable (not an array, string, or iterable object). Check data types, ensure proper array initialization, and validate iterable objects before iteration.

Object is undefined/null when trying to set properties. Initialize objects before use, check object existence, or use optional assignment patterns.

Missing closing parenthesis in function calls or expressions. Check for balanced parentheses, proper string quotes, and correct syntax structure.

Variable is not a function or is undefined. Check if function exists, verify object methods, and ensure proper function assignment and scope.

JSON string has invalid syntax. Check for proper quotes, no trailing commas, escaped characters, and valid JSON format. Use JSON.parse() with try-catch.

Object is undefined/null when accessing its properties. Use optional chaining (?.) or check if object exists before accessing properties.

Variable or function is not declared, misspelled, or out of scope. Check spelling, declare variables with let/const, and verify scope access.

Fix "x is not a function" errors.

Fix querySelector errors: validate selectors, handle empty strings, and use proper CSS selector syntax.