JSON Beautifier & Viewer

Make raw API responses readable with JSON Beautifier: automatic formatting, collapsible trees, syntax highlighting, and dark mode.

Raw API responses can be difficult to scan when everything appears as one block of text. JSON Beautifier & Viewer is an automatic JSON formatter and JSON viewer for Chrome that turns valid response pages into a clean, structured view. Open an API endpoint or another browser page containing a valid object or array and the extension handles the rest. There is no need to copy the response, open a separate editor, or press a format button. The original data remains available whenever you need to inspect it. 🌳 Explore a collapsible tree Nested objects and arrays are displayed with clear indentation and item counts. Expand the section you are investigating or collapse parts that are not relevant. This JSON tree viewer helps you follow deeply nested data without losing the surrounding structure. 🎨 Read values with syntax highlighting Keys, strings, numbers, booleans, and null values receive distinct colors. This visual separation makes the document easier to understand than a plain block of raw text. The result works as a focused JSON object viewer for everyday API debugging. ↔️ Switch between Parsed and Raw Use Parsed for an interactive tree, then switch to Raw to see the response text provided by the server. Both modes remain on the same page, so the formatted view can be compared with the original payload in one click. 🌓 Choose a comfortable theme The extension follows your system appearance by default. You can also force light mode or dark mode in the settings when you want a consistent viewing experience across browsing sessions. 🔗 Open links from the response HTTP, HTTPS, and relative URL values become clickable links. When an API returns a related resource, image path, or pagination link, you can open it without manually selecting and copying the address. ⚡ Automatically beautify JSON in Chrome The extension activates on valid response pages and avoids changing regular websites. It is useful as a JSON document viewer for API endpoints, configuration responses, test fixtures, and other structured data opened in the browser. The automatic behavior also makes it a practical JSON formatter Chrome extension: navigate to the response and start exploring. No popup workflow is required, and the toolbar button provides quick access to theme settings. 🔒 Keep formatting in the browser Processing happens locally. Response content is not uploaded to a remote formatting service. Instead of pasting development data into an online JSON formatter, you can inspect it where it was opened. This local workflow is also a convenient alternative to searching for a JSON viewer online whenever a minified response is hard to read. JSON Beautifier & Viewer keeps the parsed structure and raw content close together. Who is this JSON formatter for? • Web developers who need to view JSON returned by REST APIs • QA engineers checking response structure and values • Data specialists exploring nested objects and arrays • Students learning how structured documents are organized • Anyone who wants to beautify JSON in Chrome without copy and paste Common uses: • Inspect an API response during frontend or backend development • Follow nested objects with a collapsible tree view • Open a browser-based JSON file viewer for readable test data • Compare parsed values with the raw server response • Use dark mode while debugging at night Tip for large responses: hold Control, or Command on macOS, while collapsing a node to collapse its sibling entries together. This makes wide arrays and repeated objects faster to scan without closing every branch one by one. How to use JSON Beautifier & Viewer: 1. Install the extension. 2. Open a URL that returns a valid structured object or array. 3. The page is automatically formatted into a readable tree. 4. Expand or collapse nodes to explore the response. 5. Use Raw and Parsed to switch views, or open the settings to select a theme. Do I need an online JSON beautifier? No separate website is required for supported response pages. This JSON beautifier for Chrome formats the content automatically and keeps the workflow inside the browser. Does it change normal websites? The extension checks whether a page is a suitable text response and whether its content parses as a valid object or array. If those checks fail, it leaves the page unchanged. Install JSON Beautifier & Viewer to format response pages automatically, explore nested data with less friction, and spend less time untangling dense API payloads.