Standard Library

The standard library is loaded automatically: every package below is available in every script without an import. Call a package’s functions with package::name(...).

Each package page starts with a guide and examples, followed by an API reference generated from the docstrings in lib/*.kiwi.

Data formats

Package	Purpose
csv	Parse CSV into lists or hashmaps, with typed columns.
json	Parse and produce JSON.
yaml	Parse and produce YAML.
xml	Parse, query, build and serialize XML.
protobuf	Encode and decode Protocol Buffers.
encode	Base64, hex and URL encoding.
compress	DEFLATE, GZip, Brotli, Zstandard and ZIP.
crypto	MD5, SHA and HMAC hashes; secure random bytes and UUIDs.

Working with data

Package	Purpose
table	Filter, join, group and display lists of hashmaps.
text	Line-oriented text pipelines.
pipeline	Named, step-by-step processing pipelines.
sqlite	SQLite databases.
stat	Descriptive statistics.
math	Mathematical functions and random numbers.
collections	Heap and Set.
iter	A cursor for stepping through lists.
faker	Realistic fake data.

Built-in type extensions

Package	Purpose
string	String formatting and inspection, as string methods.
list	List predicates and searches, as list methods.
date	Date arithmetic and components, as date methods.

Text and output

Package	Purpose
fmt	printf-style formatting.
template	{{placeholder}} templates.
regex	Regular expressions.
console	Terminal colors, cursor and key input.
cli	Messages, tables, prompts and argument parsing for command-line tools.
log	Leveled logging.

Files and system

Package	Purpose
fio	Read, write and manage files and directories.
path	The Path struct.
watch	Watch files and directories for changes.
stdin	Read standard input.
env	Environment variables and command-line arguments.
dotenv	Load .env files.
sys	Run programs and manage processes.
signal	Handle OS signals.
ipc	Named-pipe messaging between processes.
native	Load native extensions written in C, C#, Rust or Zig.
ffi	Call C functions in shared libraries, and read and write native memory.

Networking

Package	Purpose
http	HTTP client.
httpserver	HTTP server with routing and middleware.
web	The interface between web apps and the server: composable middleware, mounting, streaming and a test client.
curl	HTTP requests through the system curl.
socket	TCP and TLS sockets (socket and tls).
udp	UDP datagrams.
smtp	Send email.

Concurrency and time

Package	Purpose
task	Background tasks, channels and mutexes.
time	The clock, timestamps and calendar helpers.
stopwatch	Measure elapsed time.

Development

Package	Purpose
tester	Unit tests.
bench	Benchmarks.
error	Structured errors and guards.
reflector	Runtime introspection.
hashable	Convert struct instances to hashmaps.
std	Small general helpers.

Global helpers such as d(), char(), spawn() and await() are on the Global Functions page.