BestJSONViewer

About

BestJSONViewer: The JSON Viewer, period.
BestJSONViewer is a high-performance, developer-focused JSON tool designed to handle everything from tiny config snippets to massive API responses. It isn't just a formatter—it's a complete environment to explore, query, and edit your data with total privacy.

Why BestJSONViewer?
✅ Auto-parse & beautify JSON – Instant formatting for a cleaner view.

✅ Smart JSON Picker – Extract hidden JSON from any page, including Shadow DOM.

✅ Rich Visualization – Five specialized views (Tree, Table, Graph, Raw, and Edit).

✅ JSONata Transformations – Powerful query engine to filter and map data.

✅ Fast Virtualization & Pagination – Lag-free handling of massive datasets.

✅ Live In-memory Editing – Modify nodes with real-time validation.

✅ Easy Export & Copy – One-click downloads with smart filenames.

✅ Privacy-first – Runs 100% locally with optional permissions.

🛠 Five Views for Every Workflow
Stop scrolling through endless text. Switch views to see your data differently:

Tree View: Collapsible, syntax-highlighted hierarchy with type-colored nodes.

Table View: Interactive spreadsheet-like view for arrays; perfect for data analysis.

Graph View: A visual node-graph to explore complex structures at a glance.

Raw View: Blazing fast GitHub-dark syntax highlighting for large files.

Edit View: Full-screen editor with live validation and JetBrains Mono font.

🔍 Advanced Developer Features
JSONata Query Engine: Use expressions like $sum(Orders.Amount) or Products[Price < 10] to transform JSON instantly. Includes 8 context-aware presets.

Virtualized Performance: Built with TanStack React Virtual. Whether it's 10 nodes or 10,000, the UI stays responsive with incremental loading.

Smart Extract: Use the crosshair picker to click any element on a webpage and pull out embedded JSON hidden in attributes or text.

🛡️ Privacy & Security
We believe your data belongs to you.

Zero Telemetry: No analytics, no tracking, no network requests.

Local Processing: Your JSON never leaves your device.

Optional Permissions: The extension only asks for <all_urls> if you explicitly opt-in to the Auto-Detect feature.

❓ Frequently Asked Questions
Does it handle large files?
Yes. All views are virtualized, meaning it only renders what you see. It stays snappy even on files with tens of thousands of lines.

Is it really private?
Absolutely. There are no backend servers. All transformations, queries, and edits happen entirely in your browser's memory.

How do I use the Smart Picker?
Click the extension icon and use the crosshair to select any part of a website. BestJSONViewer will attempt to find and format any JSON embedded within that element.

Built by developers, for developers.
Open source (MIT) | JetBrains Mono Font | Light & Dark Themes

Github: https://github.com/purplecandy/bestwebextension
Documentation: https://bestwebextension.com/docs/json-viewer/getting-started