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Crate
hex
Hexadecimal encoding and decoding for Rust byte slices.
What it is
hex provides functions to encode byte slices to hexadecimal strings and decode hex strings back to bytes. Encoding is allocation-free for fixed-size outputs; decoding validates input and returns descriptive errors on invalid characters.
Why it is commonly used
Used in cryptographic, hashing, and network code where binary data must be represented as printable text — hash digests, public keys, packet dumps, certificate fingerprints, and debug output.
1.1k
Repositories
92%
Actively maintained
1.0k
Updated ≤ 30 days
3.3M
Total stars
949
Owners
Counted from the Cargo.toml manifests of the 1.1k indexed repositories that declare hex as a dependency — not download counts. Dependency data last verified 2026-08-13.
Often used with
Crates that show up unusually often in hex projects. The most distinctive pairings rank first — crates these projects use far more than the average indexed Rust project does, not just crates that are popular everywhere. Each percentage is the share of hex projects that also use it.
p25610.5%hmac28.5%ed25519-dalek17.6%aes-gcm15.9%zeroize21%metrics10.1%aws-config12.8%argon212.7%subtle14.3%prometheus13.3%serde_bytes10.2%moka10.3%rand_chacha10.1%tracing-opentelemetry14.7%jsonwebtoken17.1%opentelemetry_sdk18.5%opentelemetry-otlp17.5%sha118%opentelemetry19.8%serde_with19.3%urlencoding22.1%pin-project10%blake317.4%tikv-jemallocator12.3%
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