Format, minify and validate JSON with syntax error details and document stats.
Paste any JSON payload to beautify it with 2/4-space indentation, minify it for transport, or validate it and get precise line/column error positions. Runs 100% in your browser — nothing is uploaded.
100% client-side — zero uploads, maximum privacy
Instant results — no waiting for server processing
Secure — your data never leaves your browser
Free to use — no sign-up required
Handles real-world edge cases — malformed input, nested structures, large payloads
Syntax highlighting for easier reading and debugging
Copy-to-clipboard in one click — paste directly into your editor or terminal
Works with JSON, YAML, XML, CSV, Base64, JWT, and more
No file size limits for text processing
Format minified API responses for debugging and code review
Pretty-print JSON configuration files before committing
Validate JSON syntax when building API integrations
Convert between JSON and CSV for spreadsheet analysis
Inspect deeply nested JSON objects in a readable tree view
No. The formatter runs entirely in your browser using the native JSON engine. Your data never leaves your device.
The validator uses JavaScript's strict JSON parser. Common causes: trailing commas, single quotes, comments, or missing quotes around keys.
Yes, as long as your browser tab can hold the file in memory. Files up to tens of MB are handled easily.
Convert CSV to JSON and JSON to CSV with delimiter and quote support.
Test regular expressions with live match highlighting, groups and flags.
Encode text or files to Base64 with URL-safe and Unicode support.
Decode Base64 strings back to text or files with Unicode support.
Percent-encode URL strings for query parameters and paths.
Decode percent-encoded URLs and query strings instantly.
Convert CSV to JSON and JSON to CSV with delimiter and quote support.
Test regular expressions with live match highlighting, groups and flags.
Encode text or files to Base64 with URL-safe and Unicode support.
Decode JWT headers and payloads locally — no data leaves your browser.