Developer tools

Format JSON, decode tokens, convert timestamps and generate UUIDs or QR codes, all offline in the browser.

• JSON FormatterPretty-print or minify JSON with 2-space, 4-space or tab indentation and optional key sorting.
• JSON ValidatorCheck whether text is valid JSON and see exactly where it breaks, with line, column and a caret.
• JSON to CSVTurn a JSON array of objects into CSV for Excel or Google Sheets; nested objects become dot-separated columns.
• Base64 Encode / DecodeEncode text to Base64 or decode Base64 back to text, UTF-8 safe, with a URL-safe option.
• URL Encode / DecodePercent-encode text for URLs (encodeURIComponent or encodeURI) or decode an encoded string.
• UUID GeneratorGenerate 1 to 100 random UUID v4 or time-ordered UUID v7 identifiers with crypto-grade randomness.
• JWT DecoderDecode a JSON Web Token's header and payload and see whether it has expired. Signature is not verified; the token stays in your browser.
• Unix Timestamp ConverterConvert a Unix timestamp to a date or a date to a timestamp; shows UTC, local time, ISO 8601 and relative time.
• Regex TesterTest a JavaScript regular expression against text with highlighted matches, capture groups and a timeout guard.
• QR Code GeneratorTurn a URL or text into a QR code and download it as PNG or SVG. Generated locally; nothing is uploaded.
• QR Code ScannerRead a QR code with your camera or from a screenshot, and see the content safely before opening any link.
• Barcode GeneratorMake Code 128, EAN-13, UPC-A, Code 39, ITF-14 and EAN-8 barcodes with automatic check digits, and download them as SVG or PNG.
• Wi-Fi QR Code GeneratorMake a QR code that joins your Wi-Fi network when scanned, with correct escaping of special characters. The password never leaves your device.
• vCard QR Code GeneratorTurn your contact details into a QR code that adds you to a phone's contacts, plus a .vcf file. Built on your device.