JSON Formatter
Paste JSON text and format, compress, or validate it instantly. All processing happens locally in your browser — no data is uploaded.
FAQ
What is JSON formatting?
JSON formatting restructures compressed or messy JSON text with proper indentation, making the data structure clear at a glance for developers to read and debug. Formatted JSON uses 2-space indentation.
What should I do if JSON validation fails?
Common JSON formatting errors include: 1) Strings must use double quotes ("), not single quotes; 2) No trailing comma after the last key-value pair; 3) Comments (// or /* */) are not allowed in JSON; 4) Keys must be wrapped in double quotes. Please check your JSON text and try again.
Will my data be uploaded to the server?
No. All processing is done locally in your browser. No data is uploaded anywhere, ensuring your privacy and security.
Related guide
JSON, Escape and Markdown Tools: What These Four Pages Do to Your Text Without Asking
All four pages take your text, rewrite it, and never mention it. The JSON formatter turns 1e309 into null and calls that a success; the code generator types every array by its first element, so [1,\"a\"] becomes number[] and duplicate keys become two interfaces with the same name. The HTML escaper knows exactly five characters and double-escapes anything you already escaped. The Markdown preview renders raw HTML, and a single quote in a link URL lets that HTML carry event handlers. Every figure here came from reading these pages' scripts or driving them in a browser.