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+---
+title: 'SyntaxError: Unexpected token'
+slug: Web/JavaScript/Reference/Errors/Unexpected_token
+tags:
+  - Error
+  - Errors
+  - JavaScript
+  - SyntaxError
+translation_of: Web/JavaScript/Reference/Errors/Unexpected_token
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<h2 id="Message" name="Message">メッセージ</h2>
+
+<pre class="syntaxbox">SyntaxError: expected expression, got "x"
+SyntaxError: expected property name, got "x"
+SyntaxError: expected target, got "x"
+SyntaxError: expected rest argument name, got "x"
+SyntaxError: expected closing parenthesis, got "x"
+SyntaxError: expected '=&gt;' after argument list, got "x"
+</pre>
+
+<h2 id="Error_type" name="Error_type">エラー種別</h2>
+
+<p>{{jsxref("SyntaxError")}}</p>
+
+<h2 id="What_went_wrong" name="What_went_wrong">エラーの原因</h2>
+
+<p>特定の言語構造が予想されている箇所に、ほかのものが提供されています。これは単純なタイプミスの可能性があります。</p>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<h3 id="Expression_expected" name="Expression_expected">式が期待される</h3>
+
+<p>たとえば関数を呼び出すとき、末尾のカンマは許可されていません。</p>
+
+<pre class="brush: js example-bad">for (let i = 0; i &lt; 5,; ++i) {
+  console.log(i);
+}
+// SyntaxError: expected expression, got ')'
+</pre>
+
+<p>正しくは、カンマを省略するか、他の式を追加するかしてください。</p>
+
+<pre class="brush: js example-good">for (let i = 0; i &lt; 5; ++i) {
+  console.log(i);
+}
+</pre>
+
+<h3 id="Not_enough_brackets" name="Not_enough_brackets">括弧の不足</h3>
+
+<p>時々、 <code>if</code> 文を囲む括弧を忘れることがあります。</p>
+
+<pre class="brush: js example-bad line-numbers  language-js">function round(n, upperBound, lowerBound){
+  if(n &gt; upperBound) || (n &lt; lowerBound){
+    throw 'Number ' + String(n) + ' is more than ' + String(upperBound) + ' or less than ' + String(lowerBound);
+  }else if(n &lt; ((upperBound + lowerBound)/2)){
+    return lowerBound;
+  }else{
+    return upperBound;
+  }
+} // SyntaxError: expected expression, got '||'</pre>
+
+<p>最初は括弧が正しく見えますが、 <code>||</code> が括弧の外にあることに注意してください。 <code>||</code> の周囲を括弧で囲むように修正してください。</p>
+
+<pre class="brush: js example-good">function round(n, upperBound, lowerBound){
+  if((n &gt; upperBound) || (n &lt; lowerBound)){
+    throw 'Number ' + String(n) + ' is more than ' + String(upperBound) + ' or less than ' + String(lowerBound);
+  }else if(n &lt; ((upperBound + lowerBound)/2)){
+    return lowerBound;
+  }else{
+    return upperBound;
+  }
+}
+</pre>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>{{jsxref("SyntaxError")}}</li>
+</ul>