JSON formatter

Format, minify, and validate JSON locally in your browser, with a tree view, node counts, and JSON Pointer paths. Input is not uploaded or written to the URL, local storage, or backend logs.

The tree view renders up to 3000 nodes and stops before very large objects can block the page. This tool checks syntax and structure, not JSON Schema semantics.

Input limit is 1 MiB of UTF-8 text. The lightweight scanner only reports common duplicate key and large integer diagnostics; it is not a full AST-preserving parser.