nexus-api-lab

Exact text tools for AI agents: unified diff, patch apply, regex testing, grapheme counting.

Checksum validation for AI agents: IBAN, ISBN, EAN/GTIN, UUID, ULID. Deterministic, no auth.

Exact hashing, base64/hex/URL encoding, JWT decoding and UUIDs for AI agents. No auth required.

Exact reference codes for AI agents: countries, currencies with minor units, HTTP status, MIME.

Deterministic time tools for AI agents: timezone conversion, business-day math, cron interpretation.

Japanese LLM security — prompt injection detection (jpi-guard) + PII masking (PII Guard). Free.