JSON-Studio/csv.html at main · jssuthahar/JSON-Studio · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JSON to CSV & CSV to JSON Converter — free, in your browser | JSON Studio</title>
<meta name="description" content="Convert JSON to CSV for Excel or Google Sheets, and CSV back to JSON. Nested objects flatten to dot-notation columns, quoting follows RFC 4180, and nothing is uploaded.">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="canonical" href="https://jsonstudio.msdevbuild.com/csv.html">
<link rel="manifest" href="manifest.webmanifest">
<meta name="theme-color" content="#0078d4" media="(prefers-color-scheme: light)">
<meta name="theme-color" content="#12151c" media="(prefers-color-scheme: dark)">
<link rel="apple-touch-icon" href="assets/img/apple-touch-icon.png">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-title" content="JSON Studio">
<link rel="icon" href="assets/img/favicon.svg" type="image/svg+xml">

<meta property="og:type" content="website">
<meta property="og:title" content="JSON to CSV & CSV to JSON Converter — free, in your browser">
<meta property="og:description" content="Convert JSON to CSV for Excel or Google Sheets, and CSV back to JSON. Nested objects flatten to dot-notation columns, quoting follows RFC 4180, and nothing is uploaded.">
<meta property="og:url" content="https://jsonstudio.msdevbuild.com/csv.html">
<meta property="og:image" content="https://jsonstudio.msdevbuild.com/assets/img/og-cover.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="JSON Studio — every JSON tool, in your browser">
<meta property="og:site_name" content="JSON Studio by MSDEVBUILD">

<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:image" content="https://jsonstudio.msdevbuild.com/assets/img/og-cover.png">
<meta name="twitter:title" content="JSON to CSV & CSV to JSON Converter — free, in your browser">
<meta name="twitter:description" content="Convert JSON to CSV for Excel or Google Sheets, and CSV back to JSON. Nested objects flatten to dot-notation columns, quoting follows RFC 4180, and nothing is uploaded.">

<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap" rel="stylesheet">
<link rel="stylesheet" href="assets/css/styles.css">
<link rel="stylesheet" href="assets/css/convert.css">
<link rel="stylesheet" href="assets/css/present.css">
<link rel="stylesheet" href="assets/css/workbench.css">
<link rel="stylesheet" href="assets/css/tool-focus.css">
<link rel="stylesheet" href="assets/css/editor.css">

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "SoftwareApplication",
  "name": "JSON to CSV & CSV to JSON converter — JSON Studio",
  "url": "https://jsonstudio.msdevbuild.com/csv.html",
  "applicationCategory": "DeveloperApplication",
  "operatingSystem": "Any (runs in browser)",
  "offers": { "@type": "Offer", "price": "0", "priceCurrency": "USD" },
  "creator": { "@type": "Person", "name": "Suthahar Jegatheesan", "url": "https://www.msdevbuild.com/" },
  "description": "Convert JSON to CSV or CSV to JSON in your browser. Nested objects flatten to dot-notation columns. Free, client-side, no upload."
}
</script>
<script>(function(){try{var t=localStorage.getItem('json-studio-theme');if(!t&&window.matchMedia&&matchMedia('(prefers-color-scheme: dark)').matches)t='dark';if(t)document.documentElement.setAttribute('data-theme',t);}catch(e){}})();</script>
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@graph": [
    {
      "@type": "BreadcrumbList",
      "itemListElement": [
        { "@type": "ListItem", "position": 1, "name": "JSON Studio", "item": "https://jsonstudio.msdevbuild.com/" },
        { "@type": "ListItem", "position": 2, "name": "Tools", "item": "https://jsonstudio.msdevbuild.com/tools.html" },
        { "@type": "ListItem", "position": 3, "name": "JSON ⇄ CSV", "item": "https://jsonstudio.msdevbuild.com/csv.html" }
      ]
    },
    {
      "@type": "FAQPage",
      "mainEntity": [
        { "@type": "Question", "name": "My JSON is nested — what happens to it?", "acceptedAnswer": { "@type": "Answer", "text": "Nested objects flatten to dot-notation columns such as address.city, and convert back into nested objects on the way in. Arrays inside a row are kept as JSON text in the cell." } },
        { "@type": "Question", "name": "Will it open correctly in Excel?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. If accented or non-Latin characters look wrong, tick \"Excel BOM\" — that adds the byte-order mark Excel looks for." } },
        { "@type": "Question", "name": "Does it handle commas and quotes inside values?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, in both directions: fields containing a delimiter, quote or newline are quoted and escaped per RFC 4180, and parsed back the same way." } }
      ]
    },
    {
      "@type": "HowTo",
      "name": "How to use the JSON ⇄ CSV",
      "step": [
        { "@type": "HowToStep", "position": 1, "text": "Paste a JSON array (or a CSV table — the direction is detected automatically)." },
        { "@type": "HowToStep", "position": 2, "text": "Choose the delimiter, and whether nested keys are flattened and CSV values type-inferred." },
        { "@type": "HowToStep", "position": 3, "text": "Copy the output or download it. Tick \"Excel BOM\" if Excel mangles your accented characters." }
      ]
    }
  ]
}
</script>
</head>
<body>

<div id="site-header"></div>
<span id="top"></span>

<main class="convert-shell">
  <div class="convert-head">
    <div class="container tool-topbar">
      <h1>JSON ⇄ CSV</h1>
      <p class="tt-sub">Arrays of objects to spreadsheet-ready CSV and back, nested keys flattened.</p>
      <a class="tt-about" href="#about">About &amp; FAQ ↓</a>
    </div>
    <div class="container">
      <div class="opt-bar">
        <div class="opt">
          <label>Direction</label>
          <div class="dir-pill" id="dir-pill">
            <button type="button" data-dir="auto" class="on">Auto</button>
            <button type="button" data-dir="j2c">JSON → CSV</button>
            <button type="button" data-dir="c2j">CSV → JSON</button>
          </div>
        </div>
        <div class="opt-sep"></div>
        <div class="opt">
          <label for="opt-delim">Delimiter</label>
          <select id="opt-delim">
            <option value="," selected>Comma</option>
            <option value=";">Semicolon</option>
            <option value="\t">Tab</option>
            <option value="|">Pipe</option>
          </select>
        </div>
        <div class="opt">
          <input type="checkbox" id="opt-flatten" checked>
          <label for="opt-flatten" style="cursor:pointer;">Flatten nested keys</label>
        </div>
        <div class="opt">
          <input type="checkbox" id="opt-typed" checked>
          <label for="opt-typed" style="cursor:pointer;">Infer types (CSV → JSON)</label>
        </div>
        <div class="opt">
          <input type="checkbox" id="opt-bom">
          <label for="opt-bom" style="cursor:pointer;">Excel BOM</label>
        </div>
      </div>
    </div>
  </div>
  <div class="convert-grid">
    <section class="pane">
      <div class="pane-head">
        <div class="pane-title"><span id="in-label">Input</span></div>
        <button id="btn-sample-json">Sample JSON</button>
        <button id="btn-sample-csv">Sample CSV</button>
        <button id="btn-upload">Upload</button>
        <button id="btn-clear">Clear</button>
        <input type="file" id="file-input" accept=".json,.csv,.tsv,.txt" style="display:none;">
      </div>
      <div class="pane-body">
        <textarea id="input" class="code-area" spellcheck="false" placeholder="Paste a JSON array or a CSV table — or drop a file."></textarea>
      </div>
      <div class="pane-status" id="in-status">Waiting for input.</div>
    </section>

    <section class="pane">
      <div class="pane-head">
        <div class="pane-title"><span id="out-label">Output</span></div>
        <button class="primary" id="btn-run">Convert</button>
        <button id="btn-swap">Use as input ⇄</button>
        <button id="btn-copy">Copy</button>
        <button id="btn-download">Download</button>
      </div>
      <div class="pane-body">
        <textarea id="output" class="code-area" spellcheck="false" readonly placeholder="Converted output appears here."></textarea>
        <p class="note">CSV parsing follows RFC 4180 — quoted fields, escaped quotes and embedded newlines all round-trip.</p>
      </div>
      <div class="pane-status" id="out-status"></div>
    </section>
  </div>
</main>


<section class="tool-home" id="about">
  <div class="container">
    <div class="th-more">Reference</div>
    <header class="th-head">
      <div class="kicker">JSON ⇄ CSV</div>
      <h2>About the JSON ⇄ CSV converter</h2>
      <p>Spreadsheets are still how most of the world looks at data. This converts an array of JSON objects into a CSV whose header is the union of every row's keys — so a field that only appears in later rows still gets a column — and converts CSV back to JSON, rebuilding nested objects from dot-notation headers. Quoting, escaped quotes and embedded newlines follow RFC 4180 in both directions.</p>
      <div class="cta-row">
        <a class="btn-primary" href="#top">Use the tool ↑</a>
        <a class="btn-secondary btn-present" href="presentation.html"><svg class="nav-ico" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="3" y="4" width="18" height="13" rx="2"/><path d="M12 17v3M9.5 20h5"/><path d="m10.6 8.8 4 2.7-4 2.7z" fill="currentColor" stroke="none"/></svg> Present it</a>
      </div>
    </header>

    <div class="th-features">
      <div class="th-feature">
        <div class="fi">01</div>
        <h3>Both directions</h3>
        <p>JSON to a spreadsheet-ready CSV, and CSV back to JSON, with the direction detected automatically.</p>
      </div>
      <div class="th-feature">
        <div class="fi">02</div>
        <h3>Nested keys flattened</h3>
        <p>Nested objects become dot-notation columns, and rebuild into objects on the way back.</p>
      </div>
      <div class="th-feature">
        <div class="fi">03</div>
        <h3>Header is a union</h3>
        <p>Columns cover every key in every row, so a field that appears late still gets one.</p>
      </div>
      <div class="th-feature">
        <div class="fi">04</div>
        <h3>RFC 4180 quoting</h3>
        <p>Commas, quotes and newlines inside values survive the round trip in both directions.</p>
      </div>
    </div>

    <div class="seo-grid">
      <div class="seo-main">
        <h3 id="how">How to use it</h3>
        <ol class="seo-steps">
          <li>Paste a JSON array (or a CSV table — the direction is detected automatically).</li>
          <li>Choose the delimiter, and whether nested keys are flattened and CSV values type-inferred.</li>
          <li>Copy the output or download it. Tick "Excel BOM" if Excel mangles your accented characters.</li>
        </ol>

        <h3 id="faq">Questions</h3>
        <div class="faq">
          <details>
            <summary>My JSON is nested — what happens to it?</summary>
            <div class="faq-body"><p>Nested objects flatten to dot-notation columns such as address.city, and convert back into nested objects on the way in. Arrays inside a row are kept as JSON text in the cell.</p></div>
          </details>
          <details>
            <summary>Will it open correctly in Excel?</summary>
            <div class="faq-body"><p>Yes. If accented or non-Latin characters look wrong, tick "Excel BOM" — that adds the byte-order mark Excel looks for.</p></div>
          </details>
          <details>
            <summary>Does it handle commas and quotes inside values?</summary>
            <div class="faq-body"><p>Yes, in both directions: fields containing a delimiter, quote or newline are quoted and escaped per RFC 4180, and parsed back the same way.</p></div>
          </details>
        </div>
      </div>

      <aside class="seo-side">
        <div class="seo-card" id="share">
          <h3>Share this tool</h3>
          <p>Send it to a colleague — the link only, never anything you have pasted in.</p>
          <div data-share data-share-title="JSON ⇄ CSV — JSON Studio"></div>
        </div>
        <div class="seo-card">
          <h3 class="with-ico"><svg class="nav-ico" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.7" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="3" y="4" width="18" height="13" rx="2"/><path d="M12 17v3M9.5 20h5"/><path d="m10.6 8.8 4 2.7-4 2.7z" fill="currentColor" stroke="none"/></svg> Present this tool</h3>
          <p>Demoing to a client or a class? Press <kbd>Shift</kbd><kbd>P</kbd> for full-screen presentation mode — chrome hidden, type scaled up, laser pointer included.</p>
          <a class="seo-link" href="presentation.html">How presentation mode works →</a>
        </div>
        <div class="seo-card">
          <h3>Related tools</h3>
          <ul class="seo-related">
            <li><a href="jsonl.html"><span class="ri">≡</span>JSONL ⇄ JSON</a></li>
            <li><a href="sql.html"><span class="ri">SQL</span>JSON to SQL</a></li>
            <li><a href="format.html"><span class="ri">⌗</span>Formatter & validator</a></li>
          </ul>
          <a class="seo-link" href="tools.html">All 14 tools →</a>
        </div>
        <div class="seo-card quiet">
          <h3>Private by construction</h3>
          <p>No backend exists. Everything on this page runs in your browser, so nothing you paste is uploaded, logged or retained.</p>
          <a class="seo-link" href="privacy.html">Read the privacy policy →</a>
        </div>
      </aside>
    </div>
  </div>
</section>

<div id="site-footer"></div>

<script src="assets/js/site.js"></script>
<script src="assets/js/payload-link.js"></script>
<script src="assets/js/tool-kit.js"></script>
<script src="assets/js/csv.js"></script>
<script src="assets/js/present.js"></script>
<script src="assets/js/workbench.js"></script>
<script src="assets/js/history.js"></script>
<script src="assets/js/gutter.js"></script>
<script src="assets/js/editor.js"></script>
<script src="assets/js/share.js"></script>
</body>
</html>