Overview How do I…?

Formatting & Strings

bytes
fmt
regexp
regexp/syntax
strconv
strings
text/scanner
text/tabwriter
unicode
unicode/utf16
unicode/utf8

I/O & Files

bufio
embed
io
io/fs
os
path
path/filepath

Time & Context

context
time

Concurrency

sync
sync/atomic

Collections

cmp
iter
maps
slices
sort

Encoding

encoding
encoding/ascii85
encoding/asn1
encoding/base32
encoding/base64
encoding/binary
encoding/csv
encoding/gob
encoding/hex
encoding/json
encoding/json/jsontext
encoding/json/v2
encoding/pem
encoding/xml

Hashing

hash
hash/adler32
hash/crc32
hash/crc64
hash/fnv
hash/maphash

Networking

mime
mime/multipart
mime/quotedprintable
net
net/http
net/http/cookiejar
net/http/httptest
net/http/httptrace
net/http/httputil
net/http/pprof
net/mail
net/netip
net/rpc
net/rpc/jsonrpc
net/smtp
net/textproto
net/url

Errors & Logging

errors
expvar
log
log/slog
log/syslog

Math

math
math/big
math/bits
math/cmplx
math/rand
math/rand/v2

Crypto

crypto
crypto/aes
crypto/cipher
crypto/des
crypto/dsa
crypto/ecdh
crypto/ecdsa
crypto/ed25519
crypto/elliptic
crypto/hkdf
crypto/hmac
crypto/md5
crypto/mlkem
crypto/pbkdf2
crypto/rand
crypto/rc4
crypto/rsa
crypto/sha1
crypto/sha256
crypto/sha3
crypto/sha512
crypto/subtle
crypto/tls
crypto/x509
crypto/x509/pkix

CLI & Runtime

flag
os/exec
os/signal
os/user

Archives & Compression

archive/tar
archive/zip
compress/bzip2
compress/flate
compress/gzip
compress/lzw
compress/zlib

Containers

container/heap
container/list
container/ring

Testing

testing
testing/fstest
testing/iotest
testing/quick
testing/slogtest
testing/synctest

Templates

html
html/template
text/template

Reflection & Unsafe

reflect
unsafe

Runtime & Debug

debug/buildinfo
debug/dwarf
debug/elf
debug/gosym
debug/macho
debug/pe
debug/plan9obj
runtime
runtime/cgo
runtime/coverage
runtime/debug
runtime/metrics
runtime/pprof
runtime/trace

Image

image
image/color
image/color/palette
image/draw
image/gif
image/jpeg
image/png

Database

database/sql
database/sql/driver

Go Tooling

go/ast
go/build
go/build/constraint
go/constant
go/doc
go/doc/comment
go/format
go/importer
go/parser
go/printer
go/scanner
go/token
go/types
go/version

Misc

builtin
index/suffixarray
plugin
structs
syscall
time/tzdata
unique
weak

`compress/bzip2`

Guided tour · Archives & Compression · pkg.go.dev →

bzip2 decompression only. No writer in the standard library.

Usage

NewReader

r := bzip2.NewReader(in)
io.Copy(os.Stdout, r)

On this page

Usage 1
- NewReader

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