Validate CSV structure: consistent column counts across rows, properly closed quotes, delimiter detection. Returns row/column counts and any structural errors. Pure CPU.

Compute Flesch-Kincaid Grade Level, Flesch Reading Ease, Gunning Fog Index, and Automated Readability Index from text. Returns all 4 scores plus word, sentence, and syllable counts.

Derive a cryptographic key from a password using scrypt (RFC 7914). Memory-hard by design, making it more resistant to GPU/ASIC brute-force than PBKDF2. Returns the hex-encoded derived key and all tuning parameters (N, r, p).

Expand a compressed IPv6 address to full 8-group notation (:: to 0000:...) or compress a full address by collapsing the longest zero run. Also validates format. Pure CPU, deterministic.

Convert an internationalized domain name to Punycode (ASCII-compatible encoding, RFC 3492) or decode Punycode back to Unicode. Uses Node.js built-in IDNA support. Deterministic, pure CPU.

Convert text to Unicode Braille characters (Grade 1 / uncontracted) or decode Braille back to text. Supports letters, digits, and common punctuation. Deterministic, pure CPU.

Compute MD5, SHA-1, SHA-256, SHA-512, and CRC32 checksums of a string in a single call. Useful for verifying file or payload integrity across different checksum standards without needing five separate tools.

HKDF extract-then-expand (RFC 5869) — derive output keying material from initial keying material, an optional salt, and an optional info/context string. Useful for deriving multiple keys from a single shared secret. Returns hex-encoded OKM.

Get the ISO 8601 week number, ISO day-of-week, quarter, and day-of-year for any date. Useful for fiscal/reporting calendars, weekly aggregations, and sprint planning.

Parse a standard 5-field cron expression (minute hour day-of-month month day-of-week) and return a human-readable explanation. Supports wildcards (*), ranges (1-5), lists (1,3,5), steps (*/15), and named months/days (JAN, MON). ?expression=0+9+*+*...

Convert text between naming conventions: camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, and Title Case. Auto-detects the input format by splitting on camelCase boundaries, underscores, hyphens, and spaces. Deterministic, pure CPU.

Compute the Jaccard similarity coefficient between two strings using character bigrams or word tokens. Returns the ratio of intersection to union (0 = no overlap, 1 = identical sets). Deterministic, pure CPU.

Convert between Unix epoch timestamps and ISO 8601 date strings in both directions. Provide either an epoch (seconds or milliseconds) or an ISO date string. Returns both representations plus UTC and date components.

Search autocomplete: query suggestions for a partial input as a flat JSON array. Useful for query expansion, did-you-mean refinement, and topic exploration. Returns up to 20 suggestions.

Convert a datetime from one IANA timezone to another. Accepts ISO 8601, Unix timestamps (seconds or milliseconds), or natural date strings. Returns the converted time in both timezones with UTC offset. ?datetime=2026-06-23T14:00:00&from=America/Ne...

Count business days (weekdays) between two dates, optionally excluding US federal holidays (MLK, Presidents Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, Christmas, New Year). ?start=2026-01-...

Compute multiple similarity metrics between two strings at once: Dice coefficient, Jaccard index, overlap coefficient (all bigram-based), and normalized length difference. All values 0–1. Deterministic, pure CPU.

Compute the American Soundex (NARA) phonetic hash code for one or more words. Soundex maps similar-sounding names to the same 4-character code (letter + 3 digits). Useful for fuzzy name matching. Deterministic, pure CPU.

Check XML well-formedness: balanced open/close tags, proper nesting, unescaped entities. No DTD/schema validation — syntax only. Pure CPU, deterministic.

Auto-detect the encoding format of a string: base64, base32, hex, binary, decimal, or plain text. Returns confidence scores and decoded preview for each candidate. Pure CPU, deterministic.