Loading…
Paste any JSON string and format it instantly into clean, readable, indented output. Supports 2-space, 4-space, and tab indentation. All formatting happens locally in your browser.
A JSON formatter (also called a JSON pretty printer or JSON beautifier) takes compact, unreadable JSON and adds indentation, line breaks, and proper spacing to make the structure immediately understandable. If you have ever received a minified API response like {"user":{"id":1,"name":"Alice","roles":["admin","editor"]}} and needed to read it quickly, a JSON formatter is the fastest way to get a clean, readable view.
JSON Viewer Pro's online JSON formatter runs entirely in your browser — no data is sent to any server. Paste your JSON, choose your indentation style (2 spaces, 4 spaces, or tabs), and the formatted output appears instantly. You can also sort object keys alphabetically, strip null values, and remove empty strings in one click before downloading or copying the result.
The formatter handles all valid JSON structures including deeply nested objects, large arrays, and files over 10 MB. For very large JSON files, formatting is offloaded to a Web Worker so the browser never freezes. The Monaco code editor (the same engine used in VS Code) provides syntax highlighting and error markers so you always know exactly what you're working with.
A JSON formatter takes compact or unreadable JSON and adds indentation and line breaks to make it easy to read.
Yes. All formatting runs in your browser. Your JSON is never uploaded to any server.
2 spaces, 4 spaces, and tabs are all supported.
JSON Viewer Pro — all processing runs locally in your browser. Your data is never sent to any server. Free to use, no account required.Privacy Policy·Contact