JSON Beautifier

Instantly beautify JSON in your browser — fast json beautifier, formatter and viewer. Collapse, search and copy any value.

🧩 JSON Beautifier turns raw, unreadable API output into a clean, collapsible tree the moment you open it. No copying, no pasting into a website, no waiting. Open any endpoint that returns JSON and the json beautifier does the rest, right inside the tab you are already looking at. 🚀 Quick start 1. Click "Add to Chrome" and pin the icon to your toolbar. 2. Open any URL that returns JSON. 3. That is it — the page is already formatted. There is no button to press and nothing to configure. Most people install a json beautifier, forget it is there, and simply notice that data has become readable everywhere they work. 📖 Read structure instead of guessing it Minified API responses arrive as one endless line. This json viewer rebuilds the hierarchy so you can actually see it. ➤ Collapse and expand any branch with a single click ➤ Objects and arrays show how many items they hold before you open them ➤ Indentation is configurable, so the json formatter matches how you like to read code ➤ Sort object keys alphabetically when you need to compare two responses ➤ Line numbers in the formatted tree, so you can point a colleague at a specific line — collapse a branch and the numbering follows 🔍 Search that finds everything Most tools only search what is currently drawn on screen. This one walks the parsed document itself, so a match buried inside a 5000-item array is still found and the branch is opened for you. That single difference is why people switch from an online json beautifier to something local. ⚡ Built for files that break other tools Large payloads are where a json viewer online usually freezes the tab. This extension renders in windows, expands within a node budget, and stays responsive. 1️⃣ Multi-megabyte documents open without hanging 2️⃣ Long arrays render progressively as you scroll 3️⃣ Deeply nested structures never explode into millions of nodes Very few tools survive a genuinely large export. If you have ever watched a browser tab go white while a json formatter online chewed through a few megabytes, that is the problem this design exists to solve. 📋 Copy exactly what you need ▸ Click a key to copy its path — ready to paste into your code ▸ Click a value to copy just that value ▸ Copy the whole document, formatted or sorted, in one action Anyone who has ever tried to hand-count brackets to work out a path will appreciate this. It is the small thing that makes a json object viewer worth keeping around. 🎨 Comfortable to look at - Light and dark themes, both designed properly rather than inverted - Syntax colouring that distinguishes strings, numbers, booleans and null - Long strings wrap instead of stretching the page sideways - Your settings are remembered for the next time you beautify json 🔒 Genuinely private Your data never leaves the browser. This is not a website that asks you to paste a payload into a text box — nothing is uploaded, because the extension makes no network requests at all. 🔹 Zero network calls in the extension code 🔹 No analytics, no telemetry, no accounts, no ads 🔹 Open source under the MIT licence, so you can read every line 🔹 Works offline and on internal endpoints your company would never let you paste elsewhere 🔹 Line numbers That matters more than it sounds. Production payloads contain tokens, customer records and internal identifiers. Pasting them into an online json formatter is a habit worth breaking, and a local json beautifier chrome extension removes the temptation entirely. 🔄 How it compares to a website An online json beautify tool needs three steps: copy the response, switch tabs, paste it. Then you do it again for the next request. An extension collapses that to zero steps, because the formatting happens where the data already is. 1️⃣ Nothing to copy, so nothing can be truncated by accident 2️⃣ Nothing to paste, so confidential payloads stay internal 3️⃣ Nothing to reload, so your place in a long document is kept 🧰 Fits the habits you already have Whether you reach for a json beautify online page out of habit, or keep a code beautify json bookmark you have used for years, the result you want is identical. The difference is that here it is already on screen. No modal dialogs, no focus stealing, and nothing that interrupts what you were doing. 🧪 Honest about broken input When a document looks like JSON but does not parse, most tools show a blank page. This one tells you what went wrong and where, then shows the raw text so you can still work with it. 👩‍💻 Who uses it ▸ Backend and frontend developers reading API responses all day ▸ QA engineers comparing payloads between environments ▸ Data engineers inspecting exports and .json file viewer output ▸ Technical writers checking configuration samples before publishing ▸ Anyone who has to view json occasionally and wants it to be painless ❓ Frequently asked questions ❔ Do I need to click anything to beautify json? 💡 No. Open a URL and the page is formatted automatically. ❔ Does it work on local files? 💡 Yes. Open a .json file from your disk and the json file viewer handles it the same way. ❔ Is my data sent anywhere? 💡 Never. There is no server. Everything happens locally, which is the main reason to use a json beautifier extension rather than a website. ❔ Will it slow my browser down? 💡 No. On any page that is not raw data it exits immediately and does nothing at all. ❔ Can I still see the original text? 💡 Yes. Switch to the raw view at any time from the toolbar. ❔ Does it handle huge responses? 💡 Yes. That is exactly what the windowed rendering is for, and it is where an online json viewer normally gives up. ❔ Can I change how deep it opens? 💡 Yes. Choose the expand depth in the popup, along with theme, indent width and key sorting. ❔ Does it work with APIs behind a login? 💡 Yes. Because it runs in your browser, any endpoint you can open, the json document viewer can format. ❔ Can it replace a beautifier json website? 💡 That is exactly the intention. Anything you would have pasted into such a site is handled in place instead. ❔ Why choose an extension over a json beautifier online service? 💡 Speed and confidentiality. Nothing is transmitted, and there is no round trip to wait for. ❔ Is there a paid tier? 💡 No. It is open source and complete as it is. 🎯 One job, done properly This is not a suite. It does not add a sidebar, a login, or a subscription. It is a json beautifier that makes data readable and then gets out of your way. Install it once and stop thinking about formatting again.