Format, validate, encode, decode, compare and transform JSON, text, URLs, tokens and other developer data.
Everyday engineering is full of small transformations: pretty-print a payload, minify it for an API call, encode a query parameter, decode a JWT, generate a UUID, test a regular expression.
This hub keeps those utilities in one private, browser-first place.
The JSON cluster — Formatter, Validator, Minifier, and converters to YAML, CSV and TypeScript — is built for debugging real API traffic. Paste a broken payload, find the trailing comma or unescaped quote, fix it, then minify only when you need compact transport.
Encoding tools (Base64, URL, hex) exist for transport safety, not secrecy — never treat Base64 as encryption. JWT Decoder and Hash Generator support security workflows with clear honesty about what each can and cannot prove.
Everything runs client-side by default so tokens, keys and private configs never have to leave your machine.
18 tools
Decode Base64 back into readable text, locally.
Encode any text into Base64. Runs entirely in your browser.
Pretty-print and validate JSON with clear error messages.
Decode a JWT header and payload locally. Signatures are never verified or sent anywhere.
Generate version-4 UUIDs locally using cryptographically secure randomness.
Minify or expand HTML, CSS and JavaScript and see the bytes saved. A whitespace and comment stripper for snippets — not a compiler.
Convert CSV with a header row into a JSON array.
Compare two texts line by line and see what changed.
Compress JSON by removing whitespace for smaller payloads.
Convert a JSON array of flat objects into CSV.
Generate a TypeScript interface from a sample JSON object.
Convert a JSON object into simple YAML.
Check whether text is valid JSON and see the parsed type.
Test a JavaScript regular expression against sample text.
Convert between Unix timestamps and human-readable dates.
Decode percent-encoded URLs back into readable text.
Percent-encode text for safe use in URLs and query strings.
Convert simple flat YAML (key: value lines) into JSON.
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