Developer Tools
JSON Formatter
Pretty-print and minify JSON in the browser.
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Developer Tools
Formatters, encoders, JWT inspection and converters for everyday development work.
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Developer Tools
JSON Validator
Validate JSON and show parse errors clearly.
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Developer Tools
Base64 Encoder
Encode text to Base64.
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Developer Tools
Base64 Decoder
Decode Base64 back to text.
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Developer Tools
UUID Generator
Generate UUID v4 identifiers instantly.
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Developer Tools
URL Encoder
Percent-encode URLs and query strings.
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Developer Tools
URL Decoder
Decode percent-encoded URLs.
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Developer Tools
Timestamp Converter
Convert Unix timestamps to dates and back.
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Developer Tools
JWT Decoder
Decode a JSON Web Token header and payload in your browser. Signatures are displayed, not verified.
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Developer Tools
HTML Formatter
Beautify or minify HTML markup locally in the browser.
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Related guides
- How to Format and Validate JSONFormatting is whitespace. Validation is whether the text is legal JSON. Neither one proves the object matches a TypeScript type.
- kg to lbs (and Other Mass Units)Use the international avoirdupois pound, not a rounded 2.2. The converter also handles grams, ounces and stone.
- Celsius to Fahrenheit (and Kelvin)Temperature conversion needs an offset. 0°C is 32°F, not 0°F. This converter goes through kelvin so all three scales stay consistent.
- How to Create a Strong PasswordA strong password is long and random. This generator is not a password manager — copy the result into yours and close the tab.
- How to Count Words and CharactersA word counter is only as useful as its rules. This one is explicit: hyphens split, reading time is 200 wpm, nothing is uploaded.