ecdsa-sig-formatter

Translate ECDSA signatures between ASN.1/DER and JOSE-style concatenation formats. Version 1.0.11 is the latest stable version; the package is rarely updated but widely depended on by libraries like jsonwebtoken. It converts DER-encoded signatures (common in OpenSSL, crypto libraries) to the concatenated r||s format used by JWT/JOSE standards (ES256, ES384, ES512), and vice versa. It handles base64 encoding/decoding and works with Buffer or string input. Implements no crypto logic itself, only format translation.