JSON Explorer

Open the JSON file your editor can't.
Drop in a multi-gigabyte JSON or NDJSON file and browse it in a fast, virtualized tree — no waiting for the whole thing to load.

⬇️ Download latest · Source on GitHub · Report an issue

Why this project was needed

Working with data means constantly running into JSON files that are too big to open — an API dump, a database export, a log of NDJSON events. Every obvious tool falls over: the text editor freezes, the browser tab crashes, jq gets you a slice but not a way to browse, and “online JSON viewers” are a non-starter for anything sensitive or large. The usual workaround is writing a throwaway script just to peek at the shape of the data — which is a lot of friction for a question as simple as “what’s actually in this file?”

The core problem is that almost every viewer tries to parse the entire document into memory before showing you a single line. That works fine at a few megabytes and collapses at a few gigabytes.

JSON Explorer takes the opposite approach: it indexes the file in place. It scans the byte offsets of every container once, then reads only the slice you’re actually looking at. Even 1 GB+ files open in seconds, memory stays flat no matter how big the file is, and nothing ever leaves your machine — so you can point it at a huge production export and just look.

• 🗂️ Handles huge files — millions of containers indexed in seconds; 33 M+ indexed in ~5.6 s.
• 📄 JSON & NDJSON — drag-and-drop, browse for a file, or paste JSON directly.
• 🔍 Search keys and values — case-sensitive and regex modes, with hit-by-hit navigation.
• 🎯 Go to path — jump straight to any node with a JSON path like $.a.b[3].
• 🔎 Inspector pane — pretty-printed values, byte size, child count, and a type breakdown.
• ⌨️ Keyboard-first — navigate the tree and copy values without touching the mouse.

How it works

1. Point it at a file — drop it anywhere in the window, pick it with the file browser, or paste raw JSON.
2. It indexes in place — a single pass records where every object and array lives, without loading the document into memory.
3. Browse a virtualized tree — only the visible rows are rendered, so scrolling stays smooth through millions of nodes.
4. Search, jump, inspect — find keys or values across the whole file, jump to a path, and read any node in the inspector.

Download

Screenshots

Open a file

Drop a file anywhere, browse for one, or paste JSON directly.

Indexed in place

A 1 GB file being indexed — no full load into memory.

Explore the tree

Virtualized tree beside the inspector — 33 M+ containers indexed in ~5.6 s.

Search values

Search across the whole file, with matching paths and previews.

Jump to a path

Go straight to any node by its JSON path.

Install

Grab the build for your OS from the latest release : Windows .msi, macOS .dmg (Apple Silicon and Intel), or Linux .AppImage / .deb.

The app isn’t OS-code-signed yet, so the first launch shows an “unknown publisher” warning — a reputation prompt, not a virus detection. New independent apps all start here until trust builds up.

• Windows — on “Windows protected your PC” click More info → Run anyway.

• macOS — right-click the app → Open → Open. If it says the app is “damaged”, clear the download quarantine flag once in Terminal:

  xattr -dr com.apple.quarantine "/Applications/JSON Explorer.app"
  

• Linux (.AppImage) — make it executable, then run:

  chmod +x JSON\ Explorer_*.AppImage
  

FAQ

How big a file can it open? Multi-gigabyte files are the point — it indexes byte offsets instead of loading the document, so file size is bounded by disk, not RAM.

Does my data leave my machine? No. It’s a local desktop app; the file you open never leaves your device.

JSON and NDJSON both? Yes — regular JSON documents and newline-delimited JSON (one record per line).

Is it open source? Yes, MIT licensed. Read the source .

Built with? Tauri 2, Vue 3 and Rust.

_{JSON Explorer is provided "as is", without warranty. MIT licensed. © 2026.}

• Tauri
• Rust
• Vue
• Desktop
• Json