The API building blocks you were missing.
Small reliable endpoints, one per need, on a shared foundation. Free web demo, keyed API, MCP tool.
The tools
Utility APIs, one per use case. Free web demo, keyed API, MCP tool.
Validate & verify
Checksum and format checks — no external call.
Identifier Validation
IBAN, SIRET, SIREN, VAT, BIC — checksum-verified, no external call.
Factur-X Validator
Validate Factur-X / CII e-invoices — XSD, EN 16931, profile and French rules, with a graded verdict.
Card Validator
Luhn checksum + network detection (BIN/length). Format check only — not a live card check.
Encode, hash & secure
Hashing, encoding and secrets, done right.
Hash & HMAC
MD5, SHA-1/224/256/384/512, CRC32 and HMAC digests — hex or base64.
Base Encode / Decode
Encode and decode base64, base64url, base32, base32hex and hex — padding-tolerant.
JWT Decoder
Inspect a JWT's header and payload with expiry checks — decode only, no signature trust.
Password Generator & Strength
Generate crypto-secure passwords and score strength — entropy, crack-time, warnings.
Format & transform
Reshape identifiers, text, colors and units.
UUID Generator
Generate UUID v1–v8 (RFC 9562) — random, time-ordered or deterministic (namespace + name).
Slugify
Turn any text into a clean URL slug — accent transliteration, custom separator, max length.
Case Converter
Convert identifiers between camel, pascal, snake, kebab, CONSTANT, title, dot and path case.
Color Converter & Contrast
Convert hex/rgb/hsl/hsv and compute WCAG contrast ratio between two colors.
Unit Converter
Convert length, mass, temperature, volume, area, speed, data, time, pressure and energy.
Parse & inspect
Break an input down and read it back.
Cron Parser
Parse cron expressions and @macros into a human description and the next run times.
URL Parser
Break a URL into its components and normalize it — pure parsing, no network call.
Timestamp Converter
Parse unix, ISO 8601 or "now" and convert across every representation and timezone.