BigJSON

Free, open-source large JSON file viewer Dadroit alternative

8 followers

Free, open-source large JSON file viewer Dadroit alternative

8 followers

Open and search multi-gigabyte (2–3 GB) JSON files on macOS and Windows in seconds. A free, open-source alternative to Dadroit: tree viewer, key & value RegEx search, copy & extract any value or subtree, JSON to CSV/XML export, and multi-file union. No cost, no limits, commercial use free.

Free

Launch tags:Open Source•GitHub

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Maker

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Hey Product Hunt 👋 I built BigJSON because opening a big JSON file is somehow still painful in 2026. Every time I had to inspect a 2–3 GB export — API dumps, logs, GeoJSON — VS Code would hang, my browser tab would crash, and "just use jq" isn't much fun when you actually want to browse the data. The native tools that handle this well tend to paywall large files and commercial use, so I built the free, open-source one I wanted. BigJSON is a native viewer for multi-gigabyte JSON on macOS & Windows. The trick: it never parses the file into memory. It memory-maps the file and builds a compact streaming index (~23 bytes/node), then renders only the rows on screen — so it opens a 2–3 GB JSON in ~3 seconds and searches the whole file instantly, staying around 1.5–2× the file size in RAM instead of ballooning to 20–30 GB. What it does: • 🌳 Collapsible, syntax-highlighted tree — browse from root to leaf • 🔍 Search keys and values — plain or regex, with jump-to-match • 📤 Export JSON → CSV / XML, or pull out any subtree as JSON • 📋 Right-click to copy a key, value, or jq-style path • 🔗 Union multiple files into one searchable tree • 📄 NDJSON / JSON Lines auto-detected · 20-language UI · 100% offline, no telemetry It started as a macOS weekend hack; since then it's grown to Windows, streaming CSV/XML/JSON export, clipboard extract, and a round of performance tuning — all in the open. It's 100% free and open source (MIT) — including commercial use and every feature, no limits. ⭐ Source code: https://github.com/bandusix/huge... 🌐 Site & downloads: https://bandusix.github.io/huge-... I'd genuinely love feedback — especially files that break it. What's the biggest JSON you've ever had to open? 🙏

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2mo ago

how does the multi-file union handle name collisions when keys overlap across files, does it merge them or keep them separate?

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2mo ago

Opened a 2.5 GB log dump I'd been dreading and the tree viewer rendered in a few seconds, search through nested keys actually felt instant. Really handy for anyone stuck paying for Dadroit.

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2mo ago

Finally a free option that actually opens my 2GB log dumps without choking. The regex search across the whole tree is exactly what I needed for debugging those nested payloads.

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2mo ago

Opened a 2.5 GB log dump I'd been avoiding for weeks and the search returned results almost instantly. Genuinely useful for anyone stuck squinting at JSON in a text editor.

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2mo ago

Finally tried opening a 2.5 GB log dump in it and the tree rendered before my coffee got cold. RegEx search across the whole file actually feels instant, which I did not expect.

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2mo ago

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