Quick Answer

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

Understanding the Issue

This syntax error happens when the JavaScript parser finds string literals in positions where they are not syntactically valid. Common causes include missing commas in object literals or function parameters, missing operators between strings and variables, incorrect quote usage, missing semicolons, or malformed template literals.

The Problem

This code demonstrates the issue:

Javascript Error 
// Problem 1: Missing comma in object literal
const user = {
    name: "John"
    age: 30 // Missing comma before this line
};

// Problem 2: Missing operator between string and variable
const message = "Hello" name; // Missing + operator

// Problem 3: Missing comma in function call
console.log("First message" "Second message"); // Missing comma

console.log(user);

The Solution

Here's the corrected code:

Javascript Fixed 
// Solution 1: Proper object literal syntax
const user = {
    name: "John",  // Added missing comma
    age: 30,
    email: "john@example.com"
};

console.log("User object:", user);

// Solution 2: Correct string concatenation
const name = "Alice";
const message = "Hello " + name; // Added + operator
const message2 = `Hello ${name}`; // Template literal alternative

console.log("Concatenated message:", message);
console.log("Template message:", message2);

// Solution 3: Correct function call syntax
console.log("First message", "Second message"); // Added comma
console.log("Message 1" + " " + "Message 2"); // String concatenation

// Solution 4: Array literal corrections
const items = [
    "item1",  // Comma required
    "item2",  // Comma required
    "item3"   // Last item can omit comma
];

console.log("Items array:", items);

// Solution 5: Template literal best practices
const userName = "Bob";
const userAge = 25;

const userInfo = `User: ${userName}, Age: ${userAge}`;
console.log("User info:", userInfo);

// Solution 6: Multi-line string handling
const longText = "This is a very long text " +
                 "that spans multiple lines " +
                 "using string concatenation";

console.log("Long text:", longText);

// Solution 7: Function parameter corrections
function greetUser(firstName, lastName) {
    return `Hello ${firstName} ${lastName}!`;
}

const greeting1 = greetUser("John", "Doe");
const greeting2 = greetUser("Jane", "Smith");

console.log("Greeting 1:", greeting1);
console.log("Greeting 2:", greeting2);

Key Takeaways

Add missing commas in object literals and function parameters. Use proper operators for string concatenation. Escape quotes correctly or use alternative quote styles. Check template literal syntax.