NextJSON is a fast, privacy-first Chrome extension for working with JSON. Paste raw JSON into the popup to instantly parse and format it, or let it auto-format any JSON page in your browser. Explore data in Tree, Raw, Graph, Table, or UI Preview views, run JQ/JSONPath queries, search with regex, and edit inline with undo/redo. Fetch from URLs (custom methods + headers), diff payloads, and export to JSON, CSV, Excel, YAML, or TypeScript. Light & dark themes.
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Maker
📌
Hey hunters! 👋
I built NextJSON out of a frustration every developer will recognize.
Every JSON extension I tried only worked on JSON pages — open an API response in the browser, and it formats it. But the moment I had raw JSON from a log, a Slack message, or a teammate, there was no way to just paste it in and format it. I'd end up on some random online formatter, pasting data I probably shouldn't.
So I built NextJSON to fix that first: a popup where you paste raw JSON, and it instantly parses and formats it — no page required, nothing leaves your browser.
Then I kept going, and pulled in all the things I was bouncing between different sites and tools for:
- 📋 Paste & parse raw JSON in the popup — or auto-format any JSON page
- 🌳 5 ways to explore: Tree, Raw, Graph, Table, and UI Preview
- 🌐 Fetch from URLs with custom methods & headers (CORS bypass built in) — no Postman needed
- 🔀 Diff two JSON payloads side by side
- 📤 Export to CSV, Excel, YAML, or TypeScript
- ⚡ Query with built-in JQ / JSONPath + regex search
- ✏️ Edit inline with full undo/redo
And one of my favorite parts — a powerful right-click menu on any value:
- 📍 Copy the path to any node — as dot, bracket, JSON Pointer, JSONPath, or JQ
- 🔑 Copy the key, value, or the whole entry instantly
- 🧬 Copy as code — cURL, JavaScript, Python, or a TypeScript interface
- 🎯 Filter to a key or highlight all matching keys across the tree
- ✏️ Edit, add, or delete keys right where you click
- 🔍 Show data type and even search Google for a value
The goal: one tool that does what used to take five — and keeps your data 100% local. No servers, no tracking, no accounts.
It's free, lightweight, and built in pure vanilla JS.
I'd love your feedback — what do you currently jump between tools for that you wish lived in one place? I'm reading every comment today. 🙏