JSON Studio is a private, lossless workspace for JSON. Most JSON tools either choke on big files, silently mangle your numbers, or send your data to a server. JSON Studio does none of that. It's a native desktop app built for speed and correctness: open a half-gigabyte file and start navigating immediately, knowing that what you see is byte-for-byte what's on disk. Everything runs on your own machine — no accounts, no uploads, no analytics, no network calls — making it safe for proprietary, regulated, or personal data. WHAT YOU CAN DO • Browse huge files smoothly — a virtualized tree and raw view stay responsive on documents up to 500 MB, with collapse/expand, expand-to-depth, type and item-count badges, and full keyboard navigation. • Trust your data — big integers, high-precision decimals, key order, and the exact original text are preserved losslessly. Nothing is rounded, reordered, or reformatted. • Find anything fast — search across keys and values with case sensitivity, whole-field matching, regular expressions, and subtree scoping, then jump straight to a match in the tree. • Query with JSONPath — run RFC 9535 expressions with per-document history, execution timing, result counts, and export to JSON or JSONL. • Compare two documents — a structural diff (key order ignored) matches arrays by index or by a key field and highlights what was added, removed, or changed. • Work with JSONL / NDJSON — view line-delimited records as a virtualized table with selectable columns, field statistics, and invalid-row highlighting. • Preview embedded images — string values that are data:image URIs or base64 (PNG, JPEG, GIF, WebP, SVG) can be viewed inline. • Format and export — copy pretty-printed or minified JSON, or save the re-serialized document in one click. • Stay in flow — multiple documents in tabs, remembered sessions, live reload when a file changes on disk, a node detail panel with copyable path and value, and System/Light/Dark themes. WHY PEOPLE USE IT • Private by design — your data never leaves your computer. • Lossless — exact fidelity for numbers, ordering, and formatting. • Built for scale — large files open and scroll without freezing. • Free and open source (MIT). Supported formats: .json, .jsonl, .ndjson
Developer Tools · Windows · Free
