pure-libs

123 zero-dependency Python & JavaScript micro-libraries — CRCs, hashes, RFC-correct HTTP parsers, crypto primitives, dev tools and MCP agent utilities. Each one is a single focused package: stdlib only, tested, MIT licensed. 15 of them are benchmarked faster than the popular alternative they replace.

123packages

0dependencies

39on PyPI and counting

100%original code

Dev Tools & CLI 13

The flagships. csvcomp and argpeek are on PyPI; the rest are one install away.

Semantic CSV diff (schema + rows + cells), zero deps — on PyPI

⚡ faster than pandas on keyed diffs, ~5,500× smaller install

Pythonupdated 2026-07-25

Zero-dep argv inspector + safe shell replay for CLIs

Pythonupdated 2026-07-27

Cron expression linter

⚡ 5.2× faster than croniter

Pythonupdated 2026-09-24

Deterministic env snapshot diff for CI debugging

Pythonupdated 2026-09-28

Lint rules package

Pythonupdated 2026-09-24

PII redactor for logs (JS)

JavaScriptupdated 2026-09-24

Manifest spec validator

Pythonupdated 2026-09-24

Reading-time estimator

Pythonupdated 2026-09-24

Log scrubber for secrets

Pythonupdated 2026-09-24

SMPC sync utilities

Pythonupdated 2026-09-24

Zero-dep timing spans for Python

Pythonupdated 2026-09-25

Structured trace/log formatter

⚡ 1.32× faster than stdlib traceback

Pythonupdated 2026-09-28

URL safety scanner (JS)

JavaScriptupdated 2026-09-24

Checksums & CRC 37

Every CRC variant you will ever need, each a tiny zero-dep package.

Adler-32 checksum

Pythonupdated 2026-09-24

bsd-checksum-pure

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

crc11-flexray-pure

Pythonupdated 2026-09-24

crc11-umts-pure

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

crc16-ccitt-pure

CRC-16/CCITT-FALSE

Pythonupdated 2026-09-24

crc16-en13757-pure

CRC-16/EN-13757

Pythonupdated 2026-09-24

crc16-modbus-pure

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

crc16-xmodem-pure

Pythonupdated 2026-09-24

crc17-canfd-pure

Pythonupdated 2026-09-24

crc21-canfd-pure

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

crc24-interlaken-pure

CRC-24/Interlaken

Pythonupdated 2026-09-24

crc24-lte-a-pure

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

crc30-cdma-pure

Pythonupdated 2026-09-24

crc31-philips-pure

Pythonupdated 2026-09-24

CRC-32 (ISO 3309)

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Fletcher checksum

Pythonupdated 2026-09-24

fletcher16-pure

Fletcher-16 checksum

Pythonupdated 2026-09-24

fletcher32-pure

Fletcher-32 checksum

Pythonupdated 2026-09-24

PPP FCS-16 checksum

⚡ ~1.3× faster than crcmod

Pythonupdated 2026-09-24

XOR-16 checksum

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Hashes & Sequences 18

Classic non-crypto hashes, PRNGs and low-discrepancy sequences.

Arash Partow hash

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

⚡ faster and smaller than fnvhash

Pythonupdated 2026-09-24

Jenkins lookup3 hash

Pythonupdated 2026-09-24

Jenkins one-at-a-time hash

Pythonupdated 2026-09-24

multiplier-pure

Multiplier utilities

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

nutation2006-pure

IAU 2006 nutation model

Pythonupdated 2026-09-24

Pearson hashing

Pythonupdated 2026-09-24

Pythonupdated 2026-09-24

SipHash keyed hash

Pythonupdated 2026-09-24

Sobol quasi-random sequences

Pythonupdated 2026-09-24

Van der Corput low-discrepancy sequences

Pythonupdated 2026-09-24

xorshift32-pure

Xorshift32 PRNG

Pythonupdated 2026-09-24

xxHash3 non-crypto hash

Pythonupdated 2026-09-24

HTTP & Web Standards 27

RFC-correct parsers for the headers everyone hand-rolls badly.

accept-ch-parse

Accept-CH header parser

Pythonupdated 2026-09-25

accept-encoding-parse

Accept-Encoding parser

Pythonupdated 2026-09-25

Accept header parser

⚡ 2.75× faster than npm accepts

Pythonupdated 2026-09-26

Age header parser

⚡ 1.65× faster than werkzeug

Pythonupdated 2026-09-26

Allow header parser

Pythonupdated 2026-09-26

Alt-Svc header parser

Pythonupdated 2026-09-25

RFC 6750 Bearer token parser

Pythonupdated 2026-09-26

cache-control-parse

Cache-Control parser

Pythonupdated 2026-09-25

content-range-parse

Content-Range header parser

Pythonupdated 2026-09-26

RFC 6265 cookie parser/serializer

Pythonupdated 2026-09-25

digest-fields-parse

RFC 9440 Digest Fields parser

Pythonupdated 2026-09-27

ETag parser variant

Pythonupdated 2026-09-25

ETag parser (RFC 7232)

Pythonupdated 2026-09-25

forwarded-parse

RFC 7239 Forwarded header parser

Pythonupdated 2026-09-25

geo-uri-parse-pure

RFC 5870 geo: URI parser

Pythonupdated 2026-09-29

hex-color-parse

CSS hex color parser

Pythonupdated 2026-09-26

HTTP content negotiation helpers

Pythonupdated 2026-09-25

RFC 7233 If-Range header parser

Pythonupdated 2026-09-27

RFC 8288 Link header parser

Pythonupdated 2026-09-26

multibase-parse-pure

Multibase decoder/encoder

Pythonupdated 2026-09-29

permissions-policy-parse

Permissions-Policy header parser

Pythonupdated 2026-09-26

purl-parse-pure

Package URL (purl) parser per purl-spec

⚡ 2.2× faster than packageurl-python

Pythonupdated 2026-09-28

ratelimit-headers

RateLimit header field parser

Pythonupdated 2026-09-25

sec-fetch-parse

Sec-Fetch-* header parsers

Pythonupdated 2026-09-25

server-timing-parse

Server-Timing header parser

Pythonupdated 2026-09-25

RFC 8941 Structured Field Values parser

Pythonupdated 2026-09-26

Vary header parser

⚡ 1.46× faster than werkzeug

Pythonupdated 2026-09-25

Crypto, Identity & Encoding 11

PBKDF2, HKDF, ULIDs, JWK thumbprints, ISBN/IBAN validators.

Differential privacy primitives

⚡ 12× faster than diffprivlib

Pythonupdated 2026-09-24

DTMF tone generator/detector

Pythonupdated 2026-09-24

RFC 5869 HKDF key derivation

Pythonupdated 2026-09-24

IBAN validator (mod-97)

⚡ 23× faster than schwifty

Pythonupdated 2026-09-24

ISBN-10/13 validator

⚡ 2.6× faster than isbnlib

Pythonupdated 2026-09-24

iso-ordinal-pure

ISO ordinal date utilities

⚡ 2.5× faster than strptime

Pythonupdated 2026-09-24

ISO 7064 check character systems

⚡ up to 4.1× faster than python-stdnum

Pythonupdated 2026-09-24

jwk-thumbprint-pure

RFC 7638 JWK SHA-256 thumbprints

Pythonupdated 2026-09-28

RFC 8018 PBKDF2 password hashing

Pythonupdated 2026-09-24

rfc-6901-json-pointer-pure

RFC 6901 JSON Pointer parser/evaluator, zero-dep

Pythonupdated 2026-09-29

ULID generator/parser

Pythonupdated 2026-09-24

AI Agents & MCP 17

Tooling for the agent era: MCP inspectors, replay journals, capability contracts.

agent-capability-negotiation

Capability negotiation between agents

Pythonupdated 2026-09-24

agent-replay-journal

Replayable journal of agent actions

Pythonupdated 2026-09-24

contextlens-mcp

MCP context inspection tool

Pythonupdated 2026-09-24

Dump/inspect MCP messages

Pythonupdated 2026-09-24

Diff MCP prompts across versions

Pythonupdated 2026-09-24

MCP event listener

Pythonupdated 2026-09-24

MCP server registry

Pythonupdated 2026-09-24

MCP registry CLI

Pythonupdated 2026-09-24

MCP schema utilities

⚡ 7.1× faster than langchain-mcp-adapters, ~800× smaller

Pythonupdated 2026-09-24

Passive MCP traffic inspector

Pythonupdated 2026-09-28

Sync MCP server definitions

Pythonupdated 2026-09-24

reasoning-chain

Structured reasoning chains for agents

Pythonupdated 2026-09-24

Retry-After header parser

Pythonupdated 2026-09-26

subagent-delegation-contract

Contracts for subagent delegation

Pythonupdated 2026-09-24

summary-ring-buffer

Ring buffer for conversation summaries

Pythonupdated 2026-09-24

tiktoken-context-window

Token counting for context windows

Pythonupdated 2026-09-24

tool-call-warrant

Signed warrants for agent tool calls

Pythonupdated 2026-09-24

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