{"id":10003,"date":"2025-11-14T16:58:21","date_gmt":"2025-11-14T07:58:21","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=10003"},"modified":"2025-11-20T19:43:35","modified_gmt":"2025-11-20T10:43:35","slug":"json-stringify","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/json-stringify\/","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011JSON.stringify\u3067JSON\u3092\u6574\u5f62\u3057\u3066\u8868\u793a\u3059\u308b"},"content":{"rendered":"\n<p>Web\u30b5\u30a4\u30c8\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u30c7\u30fc\u30bf\u901a\u4fe1\u6642\u306b\u6d3b\u7528\u3055\u308c\u308b \u300cJSON\u300d \u3068\u3044\u3046\u30c7\u30fc\u30bf\u5f62\u5f0f\u3067\u3059\u304c\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u5185\u3067\u30c7\u30fc\u30bf\u51e6\u7406\u3092\u884c\u3046\u969b\u306b\u306f\u6271\u3044\u304c\u96e3\u3057\u304f\u306a\u308b\u305f\u3081\u3001\u901a\u4fe1\u524d\u5f8c\u3067\u30a8\u30f3\u30b3\u30fc\u30c9\u3084\u30c7\u30b3\u30fc\u30c9\u3092\u3057\u3066\u30c7\u30fc\u30bf\u5f62\u5f0f\u3092\u5909\u63db\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u969b\u3001JSON\u5f62\u5f0f\u3078\u30a8\u30f3\u30b3\u30fc\u30c9\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u306e\u304c\u3001JSON.stringify\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<br>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001JavaScript\u3067 JSON.stringify\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__1\" class=\"wp-block-heading\">\u305d\u3082\u305d\u3082JSON\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>JSON\u306f\u3001API\u306a\u3069\u3067\u6d3b\u7528\u3055\u308c\u308b\u30c7\u30fc\u30bf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u4e00\u7a2e\u3067\u3059\u3002<\/p>\n\n\n\n<p>JavaScript Object Notation\u306e\u7565\u3067\u3001\u5143\u3005\u306f JavaScript\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u3092\u60f3\u5b9a\u3057\u3066\u4f5c\u3089\u308c\u305f\u30c7\u30fc\u30bf\u5f62\u5f0f\u3067\u3059\u304c\u3001\u73fe\u5728\u306f JavaScript\u306b\u9650\u3089\u305a\u69d8\u3005\u306a\u8a00\u8a9e\u3067\u6d3b\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">JSON.stringify\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>JSON.stringify\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u5bfe\u8c61\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5185\u5bb9\u3092 JSON \u3078\u3068\u30a8\u30f3\u30b3\u30fc\u30c9\u3059\u308b\u969b\u306b\u4f7f\u7528\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u8996\u899a\u7684\u306b\u898b\u308b\u3068JSON\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u306fJavaScript\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u4f3c\u305f\u5f62\u5f0f\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u5b9f\u614b\u3068\u3057\u3066\u306f\u5358\u306a\u308b\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u305f\u3081\u3001\u305d\u306e\u307e\u307e\u3067\u306e\u72b6\u614b\u3067\u306f\u5024\u3054\u3068\u306e\u30c7\u30fc\u30bf\u306e\u53d6\u308a\u6271\u3044\u304c\u96e3\u3057\u304f\u306a\u308a\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001\u53d7\u3051\u53d6\u3063\u305fJSON\u306f\u5fc5\u305aJavaScript\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5f62\u5f0f\u306b\u30c7\u30b3\u30fc\u30c9\u3057\u3066\u304b\u3089\u51e6\u7406\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u53cd\u5bfe\u306bJavaScript\u5074\u3067\u6271\u3063\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u305d\u306e\u307e\u307e\u30c7\u30fc\u30bf\u3068\u3057\u3066\u9001\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u305f\u3081\u3001JSON\u5f62\u5f0f\u306b\u30a8\u30f3\u30b3\u30fc\u30c9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u969b\u306b\u4f7f\u7528\u3059\u308b\u306e\u304c\u3001JSON.stringify\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_1\" class=\"wp-block-heading\">\u57fa\u672c\u69cb\u6587<\/h3>\n\n\n\n<p>JSON.stringify\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u5f62\u5f0f\u3067\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>JSON.stringify(\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u540d)<\/code><\/pre><\/div>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3001\u5b9f\u969b\u306e\u52d5\u304d\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sampleObj = {\n  name: &#39;Taro Yamada&#39;,\n  age: 25,\n  bloodtype: &#39;B&#39;\n};\n\nconsole.log(typeof(sampleObj));\nconsole.log(sampleObj);\n\nconst sampleJson = JSON.stringify(sampleObj);\n\nconsole.log(typeof(sampleJson));\nconsole.log(sampleJson);<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>object\n{ name: &#39;Taro Yamada&#39;, age: 25, bloodtype: &#39;B&#39; }\nstring\n{&quot;name&quot;:&quot;Taro Yamada&quot;,&quot;age&quot;:25,&quot;bloodtype&quot;:&quot;B&quot;}<\/code><\/pre><\/div>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u306b\u3088\u3063\u3066\u3001\u30c7\u30fc\u30bf\u578b\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u6587\u5b57\u5217\u306b\u5909\u308f\u3063\u3066\u3044\u308b\u306e\u304c\u898b\u3066\u53d6\u308c\u307e\u3059\u306d\u3002<br>\u898b\u305f\u76ee\u3067\u306f\u5c11\u3057\u5206\u304b\u308a\u3065\u3089\u3044\u3067\u3059\u304c\u3001\u30c7\u30fc\u30bf\u5185\u5bb9\u306e\u8868\u793a\u3067\u3082\u6587\u5b57\u5217\u3078\u3068\u5909\u63db\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001JSON.stringify\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092 JSON\u3078\u3068\u30a8\u30f3\u30b3\u30fc\u30c9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_2\" class=\"wp-block-heading\">JSON.stringify\u3067\u30a8\u30f3\u30b3\u30fc\u30c9\u3057\u3064\u3064\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u6574\u3048\u308b<\/h3>\n\n\n\n<p>JSON.stringify\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u4ee5\u4e0b\u306e3\u3064\u306e\u5f15\u6570\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7b2c1\u5f15\u6570\u30fb\u30fb\u30fb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/li>\n\n\n\n<li>\u7b2c2\u5f15\u6570\u30fb\u30fb\u30fb\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570<\/li>\n\n\n\n<li>\u7b2c3\u5f15\u6570\u30fb\u30fb\u30fb\u30a4\u30f3\u30c7\u30f3\u30c8<\/li>\n<\/ul>\n\n\n\n<p>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306b\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u306e\u5404\u30ad\u30fc\u3068\u5024\u304c\u5f15\u6570\u3068\u3057\u3066\u9806\u306b\u6e21\u3055\u308c\u308b\u305f\u3081\u3001\u5024\u3054\u3068\u306b\u30c7\u30fc\u30bf\u6574\u5f62\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u4f7f\u7528\u983b\u5ea6\u306f\u3042\u307e\u308a\u9ad8\u304f\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001JSON.stringify\u30e1\u30bd\u30c3\u30c9\u3067\u4f7f\u7528\u53ef\u80fd\u306a\u6a5f\u80fd\u306e1\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sampleObj = {\n  name: &#39;Taro Yamada&#39;,\n  age: 25,\n  bloodtype: &#39;B&#39;\n};\n\nconst sampleJson = JSON.stringify(sampleObj, (key, val) =&gt; {\n    if (key === &quot;name&quot;){\n        return &quot;hogehoge&quot;;\n    }\n    return val;\n});\n\nconsole.log(sampleJson);<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-json\" data-lang=\"JSON\"><code>{&quot;name&quot;:&quot;hogehoge&quot;,&quot;age&quot;:25,&quot;bloodtype&quot;:&quot;B&quot;}<\/code><\/pre><\/div>\n\n\n\n<p>\u307e\u305f\u3001\u7b2c\uff13\u5f15\u6570\u306b\u6587\u5b57\u5217\u304b\u6570\u5024\u306e\u3069\u3061\u3089\u304b\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u7d50\u679c\u306e\u51fa\u529b\u6642\u306b\u30a4\u30f3\u30c7\u30f3\u30c8\u3092\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sampleObj = {\n  name: &#39;Taro Yamada&#39;,\n  age: 25,\n  bloodtype: &#39;B&#39;\n};\n\nconst sampleJson = JSON.stringify(sampleObj, null, 2);\n\nconsole.log(sampleJson);<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-json\" data-lang=\"JSON\"><code>{\n  &quot;name&quot;: &quot;Taro Yamada&quot;,\n  &quot;age&quot;: 25,\n  &quot;bloodtype&quot;: &quot;B&quot;\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u6587\u5b57\u5217\u306e\u5834\u5408\u306f\u6307\u5b9a\u3057\u305f\u5024\u3092\u3001\u6570\u5024\u306e\u5834\u5408\u306f\u6307\u5b9a\u3057\u305f\u6570\u5206\u306e\u7a7a\u767d\u3092\u5404\u884c\u306e\u5148\u982d\u306b\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_3\" class=\"wp-block-heading\">\u914d\u5217\u3092JSON.stringify\u3067\u30a8\u30f3\u30b3\u30fc\u30c9\u3059\u308b<\/h3>\n\n\n\n<p>JSON.stringify\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u914d\u5217\u306b\u5bfe\u3057\u3066\u3082\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u30a8\u30f3\u30b3\u30fc\u30c9\u306e\u51e6\u7406\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6642\u3068\u540c\u3058\u3084\u308a\u65b9\u3067\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sampleObj = [1, 2, 3];\nconsole.log(typeof(sampleObj));\n\nconst sampleJson = JSON.stringify(sampleObj);\nconsole.log(typeof(sampleJson));\nconsole.log(sampleJson);<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>object\nstring\n[1,2,3]<\/code><\/pre><\/div>\n\n\n\n<p>\u30c7\u30fc\u30bf\u578b\u304c\u304d\u3061\u3093\u3068\u6587\u5b57\u5217\u578b\u306b\u5909\u63db\u3055\u308c\u3066\u3044\u307e\u3059\u306d\u3002<br>\u3053\u306e\u3088\u3046\u306b\u3001\u914d\u5217\u306b\u5bfe\u3057\u3066\u3082\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u3001JSON.stringify\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3092\u884c\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u5b9f\u969b\u306e\u958b\u767a\u306b\u304a\u3044\u3066\u306f\u3001JSON\u306f\u307b\u307c\u5fc5\u305a\u6271\u3046\u3068\u8a00\u3063\u3066\u3082\u904e\u8a00\u3067\u306f\u306a\u3044\u307b\u3069\u4f7f\u7528\u983b\u5ea6\u306e\u9ad8\u3044\u30c7\u30fc\u30bf\u5f62\u5f0f\u3067\u3059\u3002\u7279\u306b\u3001API\u3092\u6d3b\u7528\u3057\u3066\u30c7\u30fc\u30bf\u306e\u9001\u53d7\u4fe1\u3092\u884c\u3046\u969b\u306b\u306f\u3001JSON\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u304c\u307b\u3068\u3093\u3069\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u306f\u3057\u3063\u304b\u308a\u3068\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 id=\"outline__4\" class=\"wp-block-heading\">JavaScript\u306e\u52c9\u5f37\u65b9\u6cd5\u306f\uff1f<\/h2>\n\n\n<p>\u66f8\u7c4d\u3084\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u5b66\u7fd2\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u6628\u4eca\u3067\u306f\u3001YouTube\u306a\u3069\u306e\u52d5\u753b\u30b5\u30a4\u30c8\u3084\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u30b5\u30a4\u30c8\u306a\u3069\u3082\u5145\u5b9f\u3057\u3066\u3044\u3066\u591a\u304f\u306e\u60c5\u5831\u304c\u624b\u306b\u5165\u308a\u307e\u3059\u3002<br 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