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Package validator ================= <img align="right" src="https://raw.githubusercontent.com/go-playground/validator/v10/logo.png">[](https://gitter.im/go-playground/validator?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)  [](https://travis-ci.org/go-playground/validator) [](https://coveralls.io/github/go-playground/validator?branch=master) [](https://goreportcard.com/report/github.com/go-playground/validator) [](https://pkg.go.dev/github.com/go-playground/validator/v10)  Package validator implements value validations for structs and individual fields based on tags. It has the following **unique** features: - Cross Field and Cross Struct validations by using validation tags or custom validators. - Slice, Array and Map diving, which allows any or all levels of a multidimensional field to be validated. - Ability to dive into both map keys and values for validation - Handles type interface by determining it's underlying type prior to validation. - Handles custom field types such as sql driver Valuer see [Valuer](https://golang.org/src/database/sql/driver/types.go?s=1210:1293#L29) - Alias validation tags, which allows for mapping of several validations to a single tag for easier defining of validations on structs - Extraction of custom defined Field Name e.g. can specify to extract the JSON name while validating and have it available in the resulting FieldError - Customizable i18n aware error messages. - Default validator for the [gin](https://github.com/gin-gonic/gin) web framework; upgrading from v8 to v9 in gin see [here](https://github.com/go-playground/validator/tree/master/_examples/gin-upgrading-overriding) Installation ------------ Use go get. go get github.com/go-playground/validator/v10 Then import the validator package into your own code. import "github.com/go-playground/validator/v10" Error Return Value ------- Validation functions return type error They return type error to avoid the issue discussed in the following, where err is always != nil: * http://stackoverflow.com/a/29138676/3158232 * https://github.com/go-playground/validator/issues/134 Validator returns only InvalidValidationError for bad validation input, nil or ValidationErrors as type error; so, in your code all you need to do is check if the error returned is not nil, and if it's not check if error is InvalidValidationError ( if necessary, most of the time it isn't ) type cast it to type ValidationErrors like so: ```go err := validate.Struct(mystruct) validationErrors := err.(validator.ValidationErrors) ``` Usage and documentation ------ Please see https://pkg.go.dev/github.com/go-playground/validator/v10 for detailed usage docs. ##### Examples: - [Simple](https://github.com/go-playground/validator/blob/master/_examples/simple/main.go) - [Custom Field Types](https://github.com/go-playground/validator/blob/master/_examples/custom/main.go) - [Struct Level](https://github.com/go-playground/validator/blob/master/_examples/struct-level/main.go) - [Translations & Custom Errors](https://github.com/go-playground/validator/blob/master/_examples/translations/main.go) - [Gin upgrade and/or override validator](https://github.com/go-playground/validator/tree/v9/_examples/gin-upgrading-overriding) - [wash - an example application putting it all together](https://github.com/bluesuncorp/wash) Baked-in Validations ------ ### Fields: | Tag | Description | | - | - | | eqcsfield | Field Equals Another Field (relative)| | eqfield | Field Equals Another Field | | fieldcontains | Check the indicated characters are present in the Field | | fieldexcludes | Check the indicated characters are not present in the field | | gtcsfield | Field Greater Than Another Relative Field | | gtecsfield | Field Greater Than or Equal To Another Relative Field | | gtefield | Field Greater Than or Equal To Another Field | | gtfield | Field Greater Than Another Field | | ltcsfield | Less Than Another Relative Field | | ltecsfield | Less Than or Equal To Another Relative Field | | ltefield | Less Than or Equal To Another Field | | ltfield | Less Than Another Field | | necsfield | Field Does Not Equal Another Field (relative) | | nefield | Field Does Not Equal Another Field | ### Network: | Tag | Description | | - | - | | cidr | Classless Inter-Domain Routing CIDR | | cidrv4 | Classless Inter-Domain Routing CIDRv4 | | cidrv6 | Classless Inter-Domain Routing CIDRv6 | | datauri | Data URL | | fqdn | Full Qualified Domain Name (FQDN) | | hostname | Hostname RFC 952 | | hostname_port | HostPort | | hostname_rfc1123 | Hostname RFC 1123 | | ip | Internet Protocol Address IP | | ip4_addr | Internet Protocol Address IPv4 | | ip6_addr | Internet Protocol Address IPv6 | | ip_addr | Internet Protocol Address IP | | ipv4 | Internet Protocol Address IPv4 | | ipv6 | Internet Protocol Address IPv6 | | mac | Media Access Control Address MAC | | tcp4_addr | Transmission Control Protocol Address TCPv4 | | tcp6_addr | Transmission Control Protocol Address TCPv6 | | tcp_addr | Transmission Control Protocol Address TCP | | udp4_addr | User Datagram Protocol Address UDPv4 | | udp6_addr | User Datagram Protocol Address UDPv6 | | udp_addr | User Datagram Protocol Address UDP | | unix_addr | Unix domain socket end point Address | | uri | URI String | | url | URL String | | http_url | HTTP URL String | | url_encoded | URL Encoded | | urn_rfc2141 | Urn RFC 2141 String | ### Strings: | Tag | Description | | - | - | | alpha | Alpha Only | | alphanum | Alphanumeric | | alphanumunicode | Alphanumeric Unicode | | alphaunicode | Alpha Unicode | | ascii | ASCII | | boolean | Boolean | | contains | Contains | | containsany | Contains Any | | containsrune | Contains Rune | | endsnotwith | Ends Not With | | endswith | Ends With | | excludes | Excludes | | excludesall | Excludes All | | excludesrune | Excludes Rune | | lowercase | Lowercase | | multibyte | Multi-Byte Characters | | number | Number | | numeric | Numeric | | printascii | Printable ASCII | | startsnotwith | Starts Not With | | startswith | Starts With | | uppercase | Uppercase | ### Format: | Tag | Description | | - | - | | base64 | Base64 String | | base64url | Base64URL String | | base64rawurl | Base64RawURL String | | bic | Business Identifier Code (ISO 9362) | | bcp47_language_tag | Language tag (BCP 47) | | btc_addr | Bitcoin Address | | btc_addr_bech32 | Bitcoin Bech32 Address (segwit) | | credit_card | Credit Card Number | | mongodb | MongoDB ObjectID | | cron | Cron | | datetime | Datetime | | e164 | e164 formatted phone number | | email | E-mail String | eth_addr | Ethereum Address | | hexadecimal | Hexadecimal String | | hexcolor | Hexcolor String | | hsl | HSL String | | hsla | HSLA String | | html | HTML Tags | | html_encoded | HTML Encoded | | isbn | International Standard Book Number | | isbn10 | International Standard Book Number 10 | | isbn13 | International Standard Book Number 13 | | iso3166_1_alpha2 | Two-letter country code (ISO 3166-1 alpha-2) | | iso3166_1_alpha3 | Three-letter country code (ISO 3166-1 alpha-3) | | iso3166_1_alpha_numeric | Numeric country code (ISO 3166-1 numeric) | | iso3166_2 | Country subdivision code (ISO 3166-2) | | iso4217 | Currency code (ISO 4217) | | json | JSON | | jwt | JSON Web Token (JWT) | | latitude | Latitude | | longitude | Longitude | | luhn_checksum | Luhn Algorithm Checksum (for strings and (u)int) | |