JSON Formatter

Transform minified or inconsistently formatted JSON into beautifully indented, human-readable output with syntax highlighting. Paste any JSON and click Format to get clean, consistently indented output with every key, value, array, and nested object properly aligned. Syntax validation runs simultaneously - errors including missing commas, unquoted keys, trailing commas, and mismatched brackets are flagged with the exact line and character position. The interactive tree view lets you collapse and expand individual objects and arrays to focus on specific sections. Minify JSON back to a compact single line for pasting into code or APIs. All processing runs in your browser. No account required.