NextJSON - JSON Parser, Editor, and Formatter

Format, edit, and explore JSON — tree view, graph visualization, JQ queries, diff, and URL fetch. Fully local, zero data sent.

NextJSON turns messy JSON into a clean, readable, and interactive experience right in your browser. Whether you’re debugging API responses, exploring datasets, or working with JSON files, NextJSON helps you view, format, edit, compare, and export data faster. Paste JSON directly or enter a URL to fetch and format remote JSON instantly. Why choose NextJSON? Unlike simple JSON formatters that only show plain text, NextJSON gives you multiple ways to inspect and work with your data. Switch between tree view, graph visualization, UI preview, and more to understand complex structures at a glance. ──────Main features────── ► Tree view: Expand and collapse nested objects easily, and navigate large JSON structures with keyboard shortcuts. ► Direct URL fetch: Paste any API endpoint or JSON URL and let NextJSON fetch and load the response directly inside the extension, so you can view, format, and debug JSON without leaving your browser tab. ► Graph visualization: View your JSON as an interactive node-link diagram to understand relationships instantly. ► UI preview: Automatically convert JSON into cards, tables, forms, and dashboards for a real-world preview of your data. ► Built-in editor: Edit JSON directly in the viewer with full undo and redo support. ► JQ query engine: Filter and transform JSON with JQ-style queries and 60+ built-in functions. ► JSON diff tool: Compare two JSON objects side by side and highlight changes clearly. ► Search and filter: Find any key or value instantly, with regular expression support for advanced searches. ► Export options: Copy data, save formatted JSON, or convert it to CSV, YAML, or code snippets. ────── Right-click actions ────── NextJSON includes a powerful context menu for faster work. Copy paths, copy values, edit items, add or delete keys, search in Google, highlight matching keys, and inspect data types with a right-click. ────── Perfect for ────── ★ Developers working with REST APIs and GraphQL. ★ Data analysts exploring JSON datasets. ★ QA engineers testing API responses. ★ Students learning data structures. ★ Anyone who regularly works with JSON. ✧────── Privacy and performance ──────✧ NextJSON processes everything locally in your browser, so your data never leaves your computer. There is no analytics, no tracking, and no external server dependency. It is free, lightweight, and designed not to slow down your browser. Install NextJSON today and stop struggling with raw JSON. View, format, edit, query, compare, and export JSON directly in your browser with a fast and private tool.