Package Index

JSON parsing and serialization. ParseJSON, GetField, SetField, stringify.

HTTP client with REST support. GET, POST, PUT, DELETE, custom headers.

CSV reading and writing. ParseCSV, WriteCSV, column and row access.

SQLite3 database wrapper. Open, Execute, Query, Bind, FetchRow.

Regular expressions. Match, Search, Replace, FindAll, Groups.

String utilities. Split, Join, Trim, PadLeft, Contains, StartsWith.

Math and statistics. Clamp, Lerp, Mean, StdDev, Factorial, IsPrime.

Date/time operations. Now, FormatDate, ParseDate, AddDays, UnixTime.

File system. ReadFile, WriteFile, ListDir, CopyFile, FileExists.

Advanced collections. Stack, Queue, LinkedList, PriorityQueue, Deque.

Structured logging. Debug, Info, Warn, Error, SetLevel, ToFile.

Config parser. LoadConfig, Get, GetInt, GetBool for INI/JSON/YAML.

Cryptographic functions. SHA256, SHA512, HMAC, AESEncrypt, RandomBytes.

Data compression. Compress, Decompress, GZipFile, ZipDir (zlib).

bzip2 compression. Compress, Decompress, CompressFile, levels 1-9.

LZMA/XZ compression. Compress, Decompress, CompressXZ, file support.

Zstandard compression. Levels 1-22, streaming, dictionary training.

LZ4 ultra-fast compression. Compress, CompressHC, frame format, files.

Brotli compression. 20-26% better ratio than gzip. Browser-native (Content-Encoding: br). Quality levels 0-11, streaming encoder/decoder.

Snappy ultra-fast compression. 250-500 MB/s compress, 1-2 GB/s decompress. Used by Kafka, RocksDB, Cassandra. Framing format support.

HDF5 scientific data storage. Datasets, groups, attributes, compression.

FFTW Fast Fourier Transform. FFT1D/2D, power spectrum, window functions.

MessagePack binary serialization. Pack, Unpack, faster and smaller than JSON.

libarchive universal archiver. Create and extract ZIP, tar, 7-Zip, cpio. Supports gzip, bzip2, xz, zstd, lz4 compression.

ICU Unicode library. Normalization, locale collation, date/number formatting, transliteration, encoding conversion.

Hunspell spell checker. Check words, suggest corrections, morphological analysis. 100+ languages.

libxml2 XML parser. Parse, XPath, DOM navigation, validation, serialize.

libxslt XSLT transforms. XML to HTML/text/XML, parameters, EXSLT.

XML parsing and generation. ParseXML, GetNode, GetAttr, CreateNode.

Base64 encode/decode. Encode, Decode, EncodeURL, DecodeURL, EncodeFile.

UUID generation. NewUUID, NewUUIDv4, ParseUUID, IsValidUUID.

Input validation. IsEmail, IsURL, IsIP, IsPhone, IsAlpha, IsDate.

Text templating. Render, RenderFile, SetVar, RegisterHelper.

In-memory cache with TTL. Set, Get, Delete, Has, Clear, GetStats.

Message/task queue. Enqueue, Dequeue, Peek, Size, IsEmpty, Clear.

utf8proc Unicode text processing. NFC/NFD/NFKC/NFKD normalization, case folding, grapheme clusters, category lookup, display width.

libiconv encoding conversion. Convert between 100+ encodings: UTF-8, GBK, Shift-JIS, CP1252, KOI8-R, Big5, Latin-1. GNU libiconv.

mimalloc high-performance allocator from Microsoft. 2x faster than ptmalloc, free-list sharding, low fragmentation, secure mode, arena support.

Full-duplex WebSocket client and server. Connect, Send, Listen.

SMTP email client. HTML emails with TLS, templates, CC/BCC.

OAuth 2.0 client. Auth code flow, token exchange and refresh.

JSON Web Tokens. HS256 signing, verification, decode, expiry check.

Token bucket rate limiter. Allow(), Wait(), configurable req/sec.

libcurl HTTP client. GET, POST, auth, file upload/download, TLS, keep-alive.

ZeroMQ messaging. REQ/REP, PUB/SUB, PUSH/PULL, PAIR. High-performance sockets.

Apache Kafka client. Producer, consumer groups, delivery reports, topic metadata, partition management.

MQTT client via libmosquitto. Publish, subscribe, QoS 0/1/2, TLS, Last Will Testament, async loop.

libssh2 SSH2 client. Remote exec, SFTP upload/download, SCP, port forwarding, public-key auth.

gRPC remote procedure calls. Unary, server/client streaming, bidirectional. TLS, metadata, HTTP/2.

NATS cloud-native messaging. Pub/Sub, Request/Reply, Queue groups, JetStream persistence. ~20MB server, zero-config pub/sub.

libuv async I/O event loop. TCP/UDP, timers, file system, thread pool, child processes. Powers Node.js.

libwebsockets C WebSocket server and client. RFC 6455, TLS, HTTP/1.1, HTTP/2, per-message deflate.

GNU libmicrohttpd embedded HTTP server. REST API, Basic auth, TLS, thread pool, POST forms, file serving.

RabbitMQ C client (librabbitmq). AMQP 0-9-1: publish/consume, exchanges, queues, bindings, TLS. Durable queues, ack/nack, prefetch.

libevent async event loop. File descriptors, timers, signals, buffered I/O, async DNS, built-in HTTP server. Backends: epoll/kqueue/IOCP. Used by Memcached, Tor, tmux.

libharu PDF generator. Create PDFs with text, fonts, images, graphics, pages, and compression.

Poppler PDF reader. Extract text, render pages to images, metadata, annotations, and search.

Cairo 2D graphics. Vector drawing, text, PNG/PDF/SVG surfaces, transforms, gradients, clipping.

SDL2 multimedia. Window, 2D renderer, textures, input events, audio, game loop.

SDL2_image — load PNG, JPG, WebP, GIF, SVG, TIFF, BMP and more into SDL2 surfaces. One call: IMG_Load. Requires SDL2.

SDL2_ttf — render TrueType fonts to SDL2 surfaces. Solid/shaded/blended/LCD modes, glyph metrics, UTF-8. Wraps FreeType. Requires SDL2.

SDL2_mixer — multi-channel audio mixer. WAV, OGG, MP3, FLAC, MOD, OPUS. 32 channels, volume, panning, 3D position, music loop. Requires SDL2.

Pango text layout. Internationalized text: BiDi, RTL, complex scripts, font fallback, line wrapping, markup language. Used by GTK, GNOME, LibreOffice.

FreeType font engine. Load TTF/OTF/WOFF, render glyphs to bitmaps, hinting, kerning, metrics. Powers Android, Chrome, Linux desktop.

HarfBuzz text shaping. Unicode to glyph sequences: ligatures, kerning, Arabic/Hebrew RTL, Devanagari, CJK, BiDi, OpenType GSUB/GPOS features.

Tesseract OCR. Extract text from images and scans. 100+ languages, bounding boxes, confidence scores.

ZBar barcode and QR scanner. Decode QR, EAN, UPC, Code128, DataMatrix from images or camera frames.

OpenBLAS linear algebra. Matrix multiply, solve linear systems, SVD, eigenvalues, LU/Cholesky/QR.

GNU Scientific Library. Statistics, integration, ODEs, FFT, interpolation, random numbers, special functions.

SQLite embedded database. SQL queries, prepared statements, transactions, WAL, full-text search.

LMDB key-value store. Memory-mapped, ACID transactions, zero-copy reads, cursor iteration.

DuckDB analytical SQL. Query CSV/Parquet/JSON directly, prepared statements, transactions, OLAP columnar engine.

RocksDB embedded key-value store. LSM-tree, column families, snapshots, bloom filters, write batches, iterators. Write-heavy SSD workloads.

LevelDB embedded key-value store from Google. LSM-tree, sorted iteration, snapshots, write batches, bloom filters.

PostgreSQL client (libpq). Parameterized queries, transactions.

MySQL/MariaDB client. Query, Execute, prepared statements.

Redis client. Strings, Hashes, Lists, TTL, Pub/Sub, counters.

MongoDB driver. Find, Insert, Update, Delete with JSON filters.

YAML parser and emitter. Load files, read typed values, write output.

TOML config parser. Sections, keys, strings, integers, booleans.

Markdown to HTML. Headings, bold/italic, code blocks, lists.

Protocol Buffers serialization. Compact binary format (libprotobuf).

FlatBuffers zero-copy serialization. Schema-driven, no parse step, direct memory access.

Text diff and patch. LCS diff, unified format, file comparison.

Jansson C JSON library. Parse, create, serialize JSON. Reference-counted, thread-safe, path access, UTF-8. Battle-tested in Curl, Keepalived, Suricata.

Cap'n Proto serialization and RPC. Zero-copy reads, no encode/decode step, ~0 ns deserialization. Schema-driven, promise pipelining, capability system.

CBOR binary serialization (RFC 7049). Binary JSON alternative: 30-50% smaller, no quotes. Used in IoT, COSE, WebAuthn/FIDO2, CoAP, Kafka ecosystems.

Apache Avro serialization for C. Schema evolution, compact binary, JSON schema definition. Core of Kafka Schema Registry and Hadoop data pipelines.

GNU readline interactive line editor. History, tab completion, key bindings, vi/emacs modes.

CLI argument parser. Long/short flags, defaults, required, auto help.

PCRE2 regular expressions. Perl-compatible: lookahead, named groups, Unicode, JIT compilation, replace, split.

RE2 safe regular expressions. No backtracking, no ReDoS, linear time. Named groups, POSIX syntax. Used by Go, Chromium, Grafana.

ANSI terminal colors. 16 colors, bold, dim, 24-bit RGB, StripColors.

Terminal progress bar. In-place update, percentage, ETA.

ASCII table renderer. Box-drawing borders, auto column width.

Unit testing framework. BeginSuite, It, Expect, ExpectEqual, Summary.

Mock objects. Call tracking, stubs, Verify call counts in tests.

Fake data generator. Names, emails, addresses, Lorem ipsum, UUIDs.

Prompt templates. LoadPrompt, RenderPrompt, FewShot, ChainPrompts.

Agent memory. Save, Load, Search, Forget, SummarizeHistory.

Pre-built AI tools. WebSearch, Calculator, WikiLookup, CodeRunner.

Retrieval Augmented Generation. CreateIndex, IndexDocument, RAGComplete.

Vision AI. Describe images, OCR text, classify, compare images.

AI translation. 50+ languages, auto-detect, batch, localize.

Text classification. Sentiment, intent, spam, custom labels.

AI code assistant. Generate, Review, Explain, Fix, Convert.

Vector DB client. Qdrant/Pinecone/Weaviate. Upsert, Search, filter.

QR code generation. PNG, SVG, ANSI terminal, base64 data URL.

Image processing. Resize, crop, convert, thumbnail, blur.

OpenCV computer vision. LoadImage, Resize, Blur, EdgeDetect, FaceDetect, VideoCapture.

FFmpeg media processing. Transcode, extract frames/audio, probe info, convert formats.

PortAudio audio I/O. Record, playback, list devices, WAV read/write, stream control.

libsndfile audio file I/O. Read/write WAV, AIFF, FLAC, OGG, AU, RAW. PCM/float samples, metadata, format conversion.

Opus audio codec. Encode/decode speech and music, 6-510 kbps, VBR, DTX, JIT. Used by Discord, Zoom, WebRTC.

LibRaw RAW photo decoder. Canon CR2, Nikon NEF, Sony ARW, DNG. 1000+ cameras. Demosaic, thumbnail, GPS/EXIF metadata.

libjpeg-turbo JPEG codec. Encode, Decode, quality control, progressive, resize, metadata.

libpng PNG codec. Encode, Decode, alpha channel, compression, text metadata, color types.

libwebp WebP codec. Lossy/lossless encode, decode, quality, animation, convert from JPEG/PNG.

AVIF image codec. AV1-based next-gen format. Better than WebP, ~50% smaller than JPEG. Encode/decode.

HEIF/HEIC image codec. Read Apple iPhone photos, encode HEIF with HEVC or AV1. HDR, thumbnails, metadata.

TIFF image codec. Read/write TIFF files, multi-page, tiles, LZW/ZIP/JPEG compression, GeoTIFF.

EXIF metadata reader/writer. Read GPS, camera settings, orientation, timestamps from JPEG photos.

FAISS vector similarity search. k-NN over millions of embeddings. IndexFlat, HNSW, IVF. RAG vector store.

libxlsxwriter Excel writer. Create .xlsx workbooks, sheets, formats, formulas, charts, images.

xlsxio Excel reader/writer. Read and write .xlsx files, iterate sheets/rows/cells.

libxls Excel .xls reader. Read legacy Excel 97-2003 files, sheets, rows, cells, types.

dlib ML toolkit. Face detection, recognition, 68-landmark predictor, HOG+SVM, object detection.

libsvm Support Vector Machines. Classification, regression, SVM/SVR, kernels, cross-validation.

XGBoost gradient boosting. Train, predict, feature importance, cross-validation, tabular data.

LightGBM gradient boosting. Fast training, predict, feature importance, categorical features.

whisper.cpp speech-to-text. Transcribe audio, timestamps, language detection, VAD, translation.

SentencePiece tokenizer. Subword tokenization, encode/decode, BPE/Unigram, LLM-compatible.

ONNX Runtime inference. Run PyTorch/TensorFlow/sklearn models locally. Float/Int tensors, GPU support.

TensorFlow Lite inference. Run TFLite models on-device. GPU/NNAPI delegates, quantized INT8, 170+ ops.

GDAL geospatial data library. Read/write 200+ formats: GeoTIFF, Shapefile, GeoJSON, WMS. Raster bands, OGR vector features, coordinate reprojection.

PROJ coordinate transformations. Convert between 1000+ CRS, WGS84, UTM, Web Mercator, geodetic math.

GEOS geometry engine. Spatial predicates, buffer, union, intersection, WKT/WKB/GeoJSON, simplify.

Pure-C Git implementation. Open repos, create commits, push/pull, diff, blame, branches, tags, index — no git binary required.

Lua 5.4 scripting engine. Embed Lua in your app: execute scripts, call functions, exchange values, sandboxed eval.

Expat event-based XML parser. SAX-style callbacks: start/end elements, text, comments. Fast, streaming, low memory.

jemalloc high-performance malloc. Arena-based, low fragmentation, thread caching, heap profiling. Used by Firefox, Redis, Meta.

GMP arbitrary precision arithmetic. BigInt, BigRat, BigFloat. Cryptography, exact computation, factorial/prime/modpow.

libffi foreign function interface. Call C functions at runtime without compile-time signatures. Dynamic loading, closures, JIT support. Powers Python ctypes, Ruby FFI, LuaJIT.

libmagic file type detection. Identify files by content (magic bytes), not extension. Returns MIME type and description. Powers the Unix `file` command.

Apache Thrift RPC framework. Define services in .thrift IDL, generate code for 20+ languages. Binary, compact, JSON transports. Used by Facebook, Evernote, HBase.

libusb USB device access. Enumerate, open, control/bulk/interrupt/isochronous transfer. No kernel driver needed. Cross-platform: Linux, macOS, Windows.

libserialport serial port access. Open, configure (baud/parity/flow), read/write, list ports. Linux, macOS, Windows — one API. Sigrok project.

libmodbus Modbus protocol. RTU (RS-485 serial) and TCP modes. Read/write coils, discrete inputs, holding/input registers. PLCs, VFDs, SCADA, energy meters.

OpenSSL full TLS/SSL library. TLS client/server, X.509 certificates, EVP crypto, RSA/EC/Ed25519 keys, HMAC, PBKDF2, HKDF, CSPRNG.

libsodium modern cryptography. Encryption, signing, key exchange, hashing, HMAC, random, base64.

Argon2 password hashing. argon2id/i/d, PHC string format, verify, timing-safe, GPU-resistant.

Search the web for current information. Returns titles, URLs, snippets. Variables: query, num_results, language.

Evaluate math expressions, unit conversions and statistics. Supports complex numbers, variables, symbolic math.

Make HTTP GET/POST/PUT/DELETE requests to external APIs. Returns status, headers and parsed JSON body.

Read files from the local filesystem. Text, binary (base64), directory listing. Optional line range and encoding.

Execute Python, JavaScript or Bash in an isolated sandbox. Returns stdout, stderr, exit code. Network disabled.

Get current weather and 7-day forecast for any city or GPS coordinates. Temperature, wind, UV, precipitation.

Current date/time in any timezone. Timezone conversion, date arithmetic (add/diff), formatting, parsing.

Text transformations: Base64, URL encode, HTML escape, MD5/SHA256, slugify, truncate, word count, JSON format.

Query JSON with JSONPath or JMESPath. Extract fields, filter arrays, reshape API responses.

Regex match, find_all, replace, split, validate. Named groups, flags. Extract emails, dates, IDs from text.

Systematic AI code review. Covers correctness, security, performance, maintainability. Variables: language, focus_area, severity_level.

Generate conventional commit messages from change descriptions. 3 options from minimal to detailed. Variables: commit_type, scope, change_summary.

Generate API/module documentation from source code. Supports Markdown, JSDoc, Delphi XML. Variables: language, doc_format, audience.

Write unit and integration test suites. Covers happy path, boundaries, errors. Variables: language, test_framework, coverage_target.

Root cause analysis for bug reports and stack traces. Impact assessment, fix recommendation, mitigation. Variables: language, environment, priority.

Design REST APIs with full OpenAPI 3.0 spec. Endpoints, schemas, auth, pagination, errors. Variables: resource_name, auth_method, output_format.

Analyze and optimize SQL queries. Index recommendations, query rewrite, execution plan. Variables: database_engine, table_sizes, optimization_goal.

Systematic refactoring plan with safe incremental steps. Code smell detection, risk assessment, test strategy. Variables: language, refactoring_type, risk_tolerance.