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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JSONL / NDJSON Viewer & Converter — for logs and LLM datasets | JSON Studio</title>
<meta name="description" content="Convert JSON Lines (NDJSON) to a JSON array and back, with invalid lines reported by line number. Built for log exports and LLM fine-tuning datasets. Free and client-side.">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta property="og:title" content="JSONL / NDJSON Viewer & Converter — for logs and LLM datasets">
<meta property="og:description" content="Convert JSON Lines (NDJSON) to a JSON array and back, with invalid lines reported by line number. Built for log exports and LLM fine-tuning datasets. Free and client-side.">
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<meta name="twitter:title" content="JSONL / NDJSON Viewer & Converter — for logs and LLM datasets">
<meta name="twitter:description" content="Convert JSON Lines (NDJSON) to a JSON array and back, with invalid lines reported by line number. Built for log exports and LLM fine-tuning datasets. Free and client-side.">
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{ "@type": "Question", "name": "One line in my export is corrupt. Can I still convert it?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. By default it refuses and tells you which lines are bad; tick \"Skip invalid lines\" and it converts everything else, reporting how many it skipped." } },
{ "@type": "Question", "name": "Is this useful for OpenAI fine-tuning files?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — those are JSONL. Convert to an array to inspect or edit the set, then convert back to JSONL for upload." } }
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</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>JSONL ⇄ JSON</h1>
<p class="tt-sub">NDJSON logs and LLM datasets to a JSON array, and back again.</p>
<a class="tt-about" href="#about">About & 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="l2j">JSONL → JSON</button>
<button type="button" data-dir="j2l">JSON → JSONL</button>
</div>
</div>
<div class="opt-sep"></div>
<div class="opt">
<input type="checkbox" id="opt-pretty" checked>
<label for="opt-pretty" style="cursor:pointer;">Pretty-print array</label>
</div>
<div class="opt">
<input type="checkbox" id="opt-skip">
<label for="opt-skip" style="cursor:pointer;">Skip invalid lines</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-jsonl">Sample JSONL</button>
<button id="btn-sample-json">Sample JSON</button>
<button id="btn-upload">Upload</button>
<button id="btn-clear">Clear</button>
<input type="file" id="file-input" accept=".jsonl,.ndjson,.json,.txt" style="display:none;">
</div>
<div class="pane-body">
<textarea id="input" class="code-area" spellcheck="false" placeholder="Paste JSONL (one object per line) or a JSON array."></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>
</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">JSONL ⇄ JSON</div>
<h2>About the JSONL ⇄ JSON converter</h2>
<p>JSON Lines is how logs, data exports and LLM fine-tuning datasets travel: one JSON document per line, appendable and streamable. It is also awkward to inspect, because no ordinary JSON tool will parse the file as a whole. This converts a .jsonl file into a proper array you can read, search and feed to the other tools here, and flattens an array back to one record per line.</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>Logs and datasets</h3>
<p>Built for the NDJSON that log exports and LLM fine-tuning files actually ship as.</p>
</div>
<div class="th-feature">
<div class="fi">02</div>
<h3>Bad lines by number</h3>
<p>One corrupt record in fifty thousand is named, not hidden behind a generic failure.</p>
</div>
<div class="th-feature">
<div class="fi">03</div>
<h3>Skip and continue</h3>
<p>Convert everything that parses and get a count of what was skipped.</p>
</div>
<div class="th-feature">
<div class="fi">04</div>
<h3>Both directions</h3>
<p>Array to one-record-per-line, or a .jsonl file into an array you can actually read.</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 JSONL (one object per line) or a JSON array — the direction is detected.</li>
<li>Invalid lines are named by line number; tick "Skip invalid lines" to ignore them and convert the rest.</li>
<li>Copy or download the result as .json or .jsonl.</li>
</ol>
<h3 id="faq">Questions</h3>
<div class="faq">
<details>
<summary>What is the difference between JSONL and NDJSON?</summary>
<div class="faq-body"><p>Practically none — both mean one JSON value per line, separated by newlines. The names are used interchangeably, and this tool reads and writes both.</p></div>
</details>
<details>
<summary>One line in my export is corrupt. Can I still convert it?</summary>
<div class="faq-body"><p>Yes. By default it refuses and tells you which lines are bad; tick "Skip invalid lines" and it converts everything else, reporting how many it skipped.</p></div>
</details>
<details>
<summary>Is this useful for OpenAI fine-tuning files?</summary>
<div class="faq-body"><p>Yes — those are JSONL. Convert to an array to inspect or edit the set, then convert back to JSONL for upload.</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="JSONL ⇄ JSON — 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="csv.html"><span class="ri">J↔C</span>JSON ⇄ CSV</a></li>
<li><a href="format.html"><span class="ri">⌗</span>Formatter & validator</a></li>
<li><a href="mock.html"><span class="ri">⁂</span>Mock data generator</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/jsonl.js"></script>
<script src="assets/js/present.js"></script>
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