| bytes | Package bytes implements functions for the manipulation of byte slices. |
| compress/gzip | Package gzip implements reading and writing of gzip format compressed files, as specified in RFC 1952. |
| database/sql/driver | Package driver defines interfaces to be implemented by database drivers as used by package sql. |
| encoding/json | Package json implements encoding and decoding of JSON as defined in RFC 7159. |
| errors | Package errors implements functions to manipulate errors. |
| io/ioutil | Package ioutil implements some I/O utility functions. |