Beautify, minify and validate JSON instantly in your browser. Shows the exact error line and column when your JSON is invalid. Uses native JSON.parse No third-party library, no network request, no upload.
100% in your browser — your JSON is never uploaded to any server. Everything runs locally.
⌨️ Live formatting
Output updates as you type — no button needed.
📂 Drag a .json file
Drop a file onto the input area to load it instantly.
🔒 100% private
Nothing ever leaves your device. Zero network requests.
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Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes from text or a file — no upload
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Encode or decode URL percent-encoded text in your browser — no upload
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Convert any image to a Base64 / Data URI string — or decode back. No upload
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Decode EAN, UPC, CODE128, QR and more from an image — no upload, no app
This tool uses the browser's built-in JSON.parse() and JSON.stringify() APIs. No third-party library, no network request. Your JSON string is processed entirely on your machine, which also makes it fast: even large JSON files (hundreds of kilobytes) format in milliseconds.
When your JSON is invalid, JSON.parse() throws a SyntaxError with a position offset in the message. The tool parses that offset to calculate the exact line and column number, so you can jump straight to the mistake in your editor.
Debug API responses
Paste a raw API response from Postman or curl and instantly see its structure with clean indentation, without copying to an IDE.
Validate config files
Drop a package.json, tsconfig.json or any other config file onto the input to confirm it is valid before committing.
Minify for production
Collapse pretty-printed JSON to a single line to reduce payload size when embedding it in a script tag or shipping in a response body.
Inspect log output
Structured logs often arrive as minified JSON objects. Beautify them to read the nested keys without squinting at a single line.
No. The entire formatting and validation process happens in your browser using native JavaScript (JSON.parse and JSON.stringify). Nothing is ever sent to any server. Your JSON data never leaves your device.
Yes, completely free. No account required, no rate limit, no watermark. The JSON Formatter and Validator is a client-side developer tool — just open it and start using it.
When your JSON is invalid, the tool shows the exact position where the parser encountered an unexpected character. The line number tells you which row contains the error, and the column number tells you the character position on that row. This makes it fast to jump to the exact location in your editor.
Beautify (also called pretty-print or format) adds indentation and line breaks to make the JSON human-readable. Minify removes all whitespace and newlines to produce the smallest possible single-line string — useful for reducing payload size in APIs or config files.
Yes. Click 'Load .json file' to open a file picker, or drag and drop a .json file directly onto the input area. The file is read locally — it is not uploaded anywhere.
You can choose 2 spaces (default), 4 spaces, or a tab character. The output updates immediately when you switch. All three are passed directly to JSON.stringify's third argument for standards-compliant indentation.