JavaScript & Frontend · page 13

Enter an internationalized domain and get its punycode form, or paste punycode to get the Unicode form.

Paste text and get numeric HTML entities in decimal or hex, or paste entities to get text back.

Enter path segments and get each one percent-encoded while preserving slash structure.

Paste a suspect string and get flagged double-encoded sequences with the decoded form shown.

Pick a MIME type and paste base64 or text to get a valid data URI with size readout.

Enter text or bytes and get RFC 4648 base32 with optional padding explanation.

Enter text or a byte string and get base58 with the Bitcoin alphabet and checksum notes.

Enter a number and get its representation in bases 16, 32, 36, and 58 with round-trip checks.

Paste text and get per-character code points plus UTF-8 byte lengths highlighting multibyte chars.

Paste emoji or rare characters and get the surrogate pair breakdown with code unit math.

Convert text to unicode escape sequences or paste escapes like backslash-u sequences back to text.

Enter a file extension or content hint and get the correct MIME type with charset guidance.

Paste a password hash string and get the likely algorithm, parameters, and verification notes.

Paste text and get the CRC32 checksum in hex and decimal for integrity spot checks.

Paste mixed text and get it normalized to LF or CRLF with a count of changed lines.

Paste text and get BOM presence, its encoding guess, and a cleaned copy without it.

List permissions and get bit values, combine masks, and a decode table for flag checks.

Paste nested JSON and get a flattened key-path version plus an unflatten round-trip check.

Paste JSON or JSONL and convert between the two with per-line validation errors.

Paste YAML and get equivalent JSON, or paste JSON to get clean YAML with indentation notes.

Enter a duration string like PT2H30M and get a human breakdown plus code to produce and parse it.

Describe your content types and get a slug normalization rule set with transliteration choices.

Describe multi-key sorting needs and get a comparator function with tie-breakers and null handling.

Pick a use case and get a CSPRNG snippet with alphabet, length, and entropy readout.