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+---
+title: 'SyntaxError: JSON.parse: bad parsing'
+slug: Web/JavaScript/Reference/Errors/JSON_bad_parse
+tags:
+  - Error
+  - Errors
+  - JSON
+  - JavaScript
+  - SyntaxError
+translation_of: Web/JavaScript/Reference/Errors/JSON_bad_parse
+---
+<div>{{jsSidebar("Errors")}}</div>
+
+<p>JavaScript の例外で、 {{jsxref("JSON.parse()")}} が文字列を JSON として解釈するのに失敗した場合に発生します。</p>
+
+<h2 id="Message" name="Message">メッセージ</h2>
+
+<pre class="syntaxbox notranslate">SyntaxError: JSON.parse: unterminated string literal
+SyntaxError: JSON.parse: bad control character in string literal
+SyntaxError: JSON.parse: bad character in string literal
+SyntaxError: JSON.parse: bad Unicode escape
+SyntaxError: JSON.parse: bad escape character
+SyntaxError: JSON.parse: unterminated string
+SyntaxError: JSON.parse: no number after minus sign
+SyntaxError: JSON.parse: unexpected non-digit
+SyntaxError: JSON.parse: missing digits after decimal point
+SyntaxError: JSON.parse: unterminated fractional number
+SyntaxError: JSON.parse: missing digits after exponent indicator
+SyntaxError: JSON.parse: missing digits after exponent sign
+SyntaxError: JSON.parse: exponent part is missing a number
+SyntaxError: JSON.parse: unexpected end of data
+SyntaxError: JSON.parse: unexpected keyword
+SyntaxError: JSON.parse: unexpected character
+SyntaxError: JSON.parse: end of data while reading object contents
+SyntaxError: JSON.parse: expected property name or '}'
+SyntaxError: JSON.parse: end of data when ',' or ']' was expected
+SyntaxError: JSON.parse: expected ',' or ']' after array element
+SyntaxError: JSON.parse: end of data when property name was expected
+SyntaxError: JSON.parse: expected double-quoted property name
+SyntaxError: JSON.parse: end of data after property name when ':' was expected
+SyntaxError: JSON.parse: expected ':' after property name in object
+SyntaxError: JSON.parse: end of data after property value in object
+SyntaxError: JSON.parse: expected ',' or '}' after property value in object
+SyntaxError: JSON.parse: expected ',' or '}' after property-value pair in object literal
+SyntaxError: JSON.parse: property names must be double-quoted strings
+SyntaxError: JSON.parse: expected property name or '}'
+SyntaxError: JSON.parse: unexpected character
+SyntaxError: JSON.parse: unexpected non-whitespace character after JSON data
+SyntaxError: JSON.parse Error: Invalid character at position {0} (Edge)</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>{{jsxref("JSON.parse()")}} は文字列を JSON として解釈します。この文字列は妥当な JSON であるべきであり、不正確な構文に出会った場合、このエラーが発生します。</p>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<h3 id="JSON.parse_does_not_allow_trailing_commas" name="JSON.parse_does_not_allow_trailing_commas">JSON.parse() は末尾のカンマを許容しない</h3>
+
+<p>どちらの行でも SyntaxError が発生します。</p>
+
+<pre class="brush: js example-bad notranslate">JSON.parse('[1, 2, 3, 4,]');
+JSON.parse('{"foo": 1,}');
+// SyntaxError JSON.parse: unexpected character
+// at line 1 column 14 of the JSON data
+</pre>
+
+<p>末尾のカンマを省略すると、正しく JSON として解釈します。</p>
+
+<pre class="brush: js example-good notranslate">JSON.parse('[1, 2, 3, 4]');
+JSON.parse('{"foo": 1}');</pre>
+
+<h3 id="Property_names_must_be_double-quoted_strings" name="Property_names_must_be_double-quoted_strings">プロパティ名は二重引用符で囲んだ文字列でなければならない</h3>
+
+<p>プロパティの周囲を囲むのに、たとえば'foo' のように単一引用符を使用してはいけません。</p>
+
+<pre class="brush: js example-bad notranslate">JSON.parse("{'foo': 1}");
+// SyntaxError: JSON.parse: expected property name or '}'
+// at line 1 column 2 of the JSON data</pre>
+
+<p>代わりに "foo" と書いてください。</p>
+
+<pre class="brush: js example-good notranslate">JSON.parse('{"foo": 1}');</pre>
+
+<h3 id="Leading_zeros_and_decimal_points" name="Leading_zeros_and_decimal_points">先頭のゼロと小数点</h3>
+
+<p>01 のような先頭の 0 は使用できません。また、小数点の後には少なくとも 1 桁以上が続かなければなりません。</p>
+
+<pre class="brush: js example-bad notranslate">JSON.parse('{"foo": 01}');
+// SyntaxError: JSON.parse: expected ',' or '}' after property value
+// in object at line 1 column 2 of the JSON data
+
+JSON.parse('{"foo": 1.}');
+// SyntaxError: JSON.parse: unterminated fractional number
+// at line 1 column 2 of the JSON data
+</pre>
+
+<p>0 を除いて 1 だけを書いてください。また、小数点の後には少なくとも 1 桁の数字を置いてください。</p>
+
+<pre class="brush: js example-good notranslate">JSON.parse('{"foo": 1}');
+JSON.parse('{"foo": 1.0}');
+</pre>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>{{jsxref("JSON")}}</li>
+ <li>{{jsxref("JSON.parse()")}}</li>
+ <li>{{jsxref("JSON.stringify()")}}</li>
+</ul>