V3 · v0.1.1

JSON Formatter Next

JSON Formatter Next turns raw JSON responses into a readable tree with highlighting, collapsible nodes, fast search, copy, and download. Built for APIs, logs, and debugging without extra tabs.

Install from Chrome Web Store All extensions

JSON Formatter Next

Beautiful JSON right in the browser

Features

What you get in practice — not just a checklist.

Auto-detect JSON pages

Recognizes application/json responses and JSON-shaped pre bodies, then replaces the raw dump with a readable view — without leaking styles onto the host page thanks to Shadow DOM isolation.

Syntax highlighting & pretty-print

Keys, strings, numbers, booleans, and null get distinct colors so large payloads stay scannable. Pretty-print keeps nesting clear whether you are reading an API response or a log export.

Collapsible tree with counts

Objects and arrays fold and expand with item counts on each node. Expand all or collapse all from the toolbar when you need the big picture or a focused path.

Search across keys and values

Find nested fields fast with match highlighting. Useful when debugging large documents where the key you need is buried several levels deep.

Copy, download, and raw view

Copy the formatted document, download it as a file, or switch back to the raw payload. The toolbar stays out of the way until you need it.

Structural JSON diff

Compare two JSON documents and see what was added, removed, or changed. Built for API versioning checks and config reviews without leaving the browser.

Theme and auto-format controls

Light, dark, or system theme syncs across the formatter, popup, and options. Toggle auto-formatting from the popup when you want the original page untouched.

Privacy

Settings are stored locally. Details are on the Privacy Policy page.

Permissions

storageactiveTab

FAQ

Common questions about JSON Formatter.

When does JSON Formatter Next activate?

It runs on pages that look like raw JSON — typically application/json responses or a pre element that contains a JSON document. Open any API endpoint that returns JSON to see it in action.

Does it change how other websites look?

No. The formatter UI is mounted inside a Shadow DOM so its styles stay isolated and do not leak onto normal HTML pages.

Can I turn off auto-formatting?

Yes. Disable auto-formatting from the popup or options page. Settings sync via chrome.storage so the preference follows you across windows.

Is my JSON sent to a server?

No. Parsing, highlighting, search, and diff all run locally in your browser. Nothing is uploaded to FuriaHub or third parties.

What is the JSON Diff feature for?

Diff compares two documents structurally so you can spot added, removed, and changed paths — handy when checking API responses between environments or versions.

Blog

Guides and tips for getting more out of JSON Formatter.

May 12, 2026

How to read API JSON faster in Chrome

Turn raw API dumps into a searchable tree without opening DevTools or pasting into an external formatter.

When you open an API URL in Chrome, the browser often shows a wall of minified text. JSON Formatter Next detects that payload and rebuilds it as a collapsible tree with syntax colors, so you can expand only the branch you care about.

Use search when the field name is known but the path is not. Match highlighting jumps you to keys and values without scrolling through thousands of lines.

For release checks, paste a previous response into Diff and compare it with the live document. Structural changes stand out even when key order differs.

Jun 3, 2026

Using JSON Diff for everyday debugging

Catch breaking API changes by comparing two responses side by side inside the extension.

Diff is most useful when staging and production disagree. Capture both payloads, run Diff, and walk the added / removed / changed paths instead of eyeballing two files.

It also helps when a backend renames nested fields. The tree view shows exactly where the structure diverged, which is faster than a line-based text diff on minified JSON.