| database/sql/driver | Package driver defines interfaces to be implemented by database drivers as used by package sql. |
| encoding | Package encoding defines interfaces shared by other packages that convert data to and from byte-level and textual representations. |
| encoding/base64 | Package base64 implements base64 encoding as specified by RFC 4648. |
| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/asaskevich/govalidator | Package govalidator is package of validators and sanitizers for strings, structs and collections. |
| github.com/globalsign/mgo/bson | Package bson is an implementation of the BSON specification for Go: |
| github.com/go-openapi/errors | Package errors provides an Error interface and several concrete types implementing this interface to manage API errors and JSON-schema validation errors. |
| github.com/mailru/easyjson/jlexer | Package jlexer contains a JSON lexer implementation. |
| github.com/mailru/easyjson/jwriter | Package jwriter contains a JSON writer. |
| github.com/mitchellh/mapstructure | Package mapstructure exposes functionality to convert one arbitrary Go type into another, typically to convert a map[string]interface{} into a native Go structure. |
| reflect | Package reflect implements run-time reflection, allowing a program to manipulate objects with arbitrary types. |
| regexp | Package regexp implements regular expression search. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| time | Package time provides functionality for measuring and displaying time. |