About JSON Formatter

Parses, validates, and pretty-prints JSON with real-time syntax error reporting that pinpoints the exact line and column of the problem. Switch to an interactive tree view to explore deeply nested data: collapse and expand any branch, filter by key or value (matching branches auto-expand), and copy the JSONPath of any node. Sort object keys alphabetically, minify to shrink payloads, and copy or download the result. Runs entirely in-browser\u2014your data never leaves the page.

• Interactive tree view with collapsible nodes, type-colored values, and per-node JSONPath copy
• Live filter prunes the tree to matching keys or values and auto-expands matching branches
• Sort keys recursively orders object keys alphabetically in both text and tree views
• Formats using 2-space indentation, the default for most linters and .editorconfig setups
• Error messages extract position data from the native JSON.parse exception to show line:column
• Stats panel counts objects, arrays, strings, numbers, booleans, and nulls in the parsed tree
• Minified output strips all whitespace, typically reducing JSON size by 15\u201330%

Frequently Asked Questions

What\u2019s the maximum JSON size this can handle?

Whatever your browser\u2019s JavaScript heap allows\u2014typically 500MB+ on modern machines. There\u2019s no server roundtrip, so the only bottleneck is JSON.parse performance, which V8 handles at roughly 200MB/s.

Does this fix invalid JSON?

No. It validates and reports errors but doesn\u2019t attempt auto-correction. Trailing commas, single quotes, and unquoted keys are common issues\u2014all invalid per RFC 8259.