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---
title: 'SyntaxError: JSON.parse: bad parsing'
slug: Web/JavaScript/Reference/Errors/JSON_bad_parse
tags:
- Errors
- JSON
- JavaScript
- SyntaxError
- 方法
translation_of: Web/JavaScript/Reference/Errors/JSON_bad_parse
---
<div>{{jsSidebar("Errors")}}</div>
<h2 id="信息">信息</h2>
<pre class="syntaxbox">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
</pre>
<h2 id="错误类型">错误类型</h2>
<p>{{jsxref("SyntaxError")}}</p>
<h2 id="哪里出错了">哪里出错了?</h2>
<p>{{jsxref("JSON.parse()")}} 会把一个字符串解析成 JSON 对象。如果字符串书写正确，那么其将会被解析成一个有效的 JSON，但是这个字符串被检测出错误语法的时候将会抛出错误。</p>
<h2 id="示例">示例</h2>
<h3 id="JSON.parse()_不允许在末尾添加多余的逗号"><code>JSON.parse()</code> 不允许在末尾添加多余的逗号</h3>
<p>下面两行代码都会抛出错误:</p>
<pre class="brush: js example-bad">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>省略末尾多余的逗号解析 JSON 就是正确:</p>
<pre class="brush: js example-good">JSON.parse('[1, 2, 3, 4 ]');
JSON.parse('{"foo" : 1 }');</pre>
<h3 id="JSON_的属性名必须使用双引号">JSON 的属性名必须使用双引号</h3>
<p>属性名上不能使用单引号，例如： 'foo'。</p>
<pre class="brush: js example-bad">JSON.parse("{'foo' : 1 }");
// SyntaxError: JSON.parse: expected property name or '}'
// at line 1 column 2 of the JSON data</pre>
<p>取而代之，写成 "foo"：</p>
<pre class="brush: js example-good">JSON.parse('{"foo" : 1 }');</pre>
<h3 id="前导_0_和小数点">前导 0 和小数点</h3>
<p>数字不能用 0 开头，比如01，并且你的小数点后面必须跟着至少一个数字。</p>
<pre class="brush: js example-bad">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>正确的写法应该是只写一个1，不书写前面的0。在小数点的后面至少要跟上一个数字:</p>
<pre class="brush: js example-good">JSON.parse('{"foo" : 1 }');
JSON.parse('{"foo" : 1.0 }');
</pre>
<h2 id="相关链接">相关链接</h2>
<ul>
<li>{{jsxref("JSON")}}</li>
<li>{{jsxref("JSON.parse()")}}</li>
<li>{{jsxref("JSON.stringify()")}}</li>
</ul>
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