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Showing content from https://github.com/go-playground/validator/tree/v10.4.1 below:

GitHub - go-playground/validator at v10.4.1

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
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 web framework; upgrading from v8 to v9 in gin see here

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"

Validation functions return type error

They return type error to avoid the issue discussed in the following, where err is always != nil:

Validator 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:

err := validate.Struct(mystruct)
validationErrors := err.(validator.ValidationErrors)

Please see https://godoc.org/github.com/go-playground/validator for detailed usage docs.

Tag Description eqcsfield Field Equals Another Field (relative) eqfield Field Equals Another Field fieldcontains NOT DOCUMENTED IN doc.go fieldexcludes NOT DOCUMENTED IN doc.go 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 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 url_encoded URL Encoded urn_rfc2141 Urn RFC 2141 String Tag Description alpha Alpha Only alphanum Alphanumeric alphanumunicode Alphanumeric Unicode alphaunicode Alpha Unicode ascii ASCII contains Contains containsany Contains Any containsrune Contains Rune endswith Ends With lowercase Lowercase multibyte Multi-Byte Characters number NOT DOCUMENTED IN doc.go numeric Numeric printascii Printable ASCII startswith Starts With uppercase Uppercase Tag Description base64 Base64 String base64url Base64URL String btc_addr Bitcoin Address btc_addr_bech32 Bitcoin Bech32 Address (segwit) 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 json JSON latitude Latitude longitude Longitude rgb RGB String rgba RGBA String ssn Social Security Number SSN uuid Universally Unique Identifier UUID uuid3 Universally Unique Identifier UUID v3 uuid3_rfc4122 Universally Unique Identifier UUID v3 RFC4122 uuid4 Universally Unique Identifier UUID v4 uuid4_rfc4122 Universally Unique Identifier UUID v4 RFC4122 uuid5 Universally Unique Identifier UUID v5 uuid5_rfc4122 Universally Unique Identifier UUID v5 RFC4122 uuid_rfc4122 Universally Unique Identifier UUID RFC4122 Tag Description eq Equals gt Greater than gte Greater than or equal lt Less Than lte Less Than or Equal ne Not Equal Tag Description dir Directory endswith Ends With excludes Excludes excludesall Excludes All excludesrune Excludes Rune file File path isdefault Is Default len Length max Maximum min Minimum oneof One Of required Required required_if Required If required_unless Required Unless required_with Required With required_with_all Required With All required_without Required Without required_without_all Required Without All excluded_with Excluded With excluded_with_all Excluded With All excluded_without Excluded Without excluded_without_all Excluded Without All unique Unique Run on MacBook Pro (15-inch, 2017) go version go1.10.2 darwin/amd64

goos: darwin
goarch: amd64
pkg: github.com/go-playground/validator
BenchmarkFieldSuccess-8                                         20000000                83.6 ns/op             0 B/op          0 allocs/op
BenchmarkFieldSuccessParallel-8                                 50000000                26.8 ns/op             0 B/op          0 allocs/op
BenchmarkFieldFailure-8                                          5000000               291 ns/op             208 B/op          4 allocs/op
BenchmarkFieldFailureParallel-8                                 20000000               107 ns/op             208 B/op          4 allocs/op
BenchmarkFieldArrayDiveSuccess-8                                 2000000               623 ns/op             201 B/op         11 allocs/op
BenchmarkFieldArrayDiveSuccessParallel-8                        10000000               237 ns/op             201 B/op         11 allocs/op
BenchmarkFieldArrayDiveFailure-8                                 2000000               859 ns/op             412 B/op         16 allocs/op
BenchmarkFieldArrayDiveFailureParallel-8                         5000000               335 ns/op             413 B/op         16 allocs/op
BenchmarkFieldMapDiveSuccess-8                                   1000000              1292 ns/op             432 B/op         18 allocs/op
BenchmarkFieldMapDiveSuccessParallel-8                           3000000               467 ns/op             432 B/op         18 allocs/op
BenchmarkFieldMapDiveFailure-8                                   1000000              1082 ns/op             512 B/op         16 allocs/op
BenchmarkFieldMapDiveFailureParallel-8                           5000000               425 ns/op             512 B/op         16 allocs/op
BenchmarkFieldMapDiveWithKeysSuccess-8                           1000000              1539 ns/op             480 B/op         21 allocs/op
BenchmarkFieldMapDiveWithKeysSuccessParallel-8                   3000000               613 ns/op             480 B/op         21 allocs/op
BenchmarkFieldMapDiveWithKeysFailure-8                           1000000              1413 ns/op             721 B/op         21 allocs/op
BenchmarkFieldMapDiveWithKeysFailureParallel-8                   3000000               575 ns/op             721 B/op         21 allocs/op
BenchmarkFieldCustomTypeSuccess-8                               10000000               216 ns/op              32 B/op          2 allocs/op
BenchmarkFieldCustomTypeSuccessParallel-8                       20000000                82.2 ns/op            32 B/op          2 allocs/op
BenchmarkFieldCustomTypeFailure-8                                5000000               274 ns/op             208 B/op          4 allocs/op
BenchmarkFieldCustomTypeFailureParallel-8                       20000000               116 ns/op             208 B/op          4 allocs/op
BenchmarkFieldOrTagSuccess-8                                     2000000               740 ns/op              16 B/op          1 allocs/op
BenchmarkFieldOrTagSuccessParallel-8                             3000000               474 ns/op              16 B/op          1 allocs/op
BenchmarkFieldOrTagFailure-8                                     3000000               471 ns/op             224 B/op          5 allocs/op
BenchmarkFieldOrTagFailureParallel-8                             3000000               414 ns/op             224 B/op          5 allocs/op
BenchmarkStructLevelValidationSuccess-8                         10000000               213 ns/op              32 B/op          2 allocs/op
BenchmarkStructLevelValidationSuccessParallel-8                 20000000                91.8 ns/op            32 B/op          2 allocs/op
BenchmarkStructLevelValidationFailure-8                          3000000               473 ns/op             304 B/op          8 allocs/op
BenchmarkStructLevelValidationFailureParallel-8                 10000000               234 ns/op             304 B/op          8 allocs/op
BenchmarkStructSimpleCustomTypeSuccess-8                         5000000               385 ns/op              32 B/op          2 allocs/op
BenchmarkStructSimpleCustomTypeSuccessParallel-8                10000000               161 ns/op              32 B/op          2 allocs/op
BenchmarkStructSimpleCustomTypeFailure-8                         2000000               640 ns/op             424 B/op          9 allocs/op
BenchmarkStructSimpleCustomTypeFailureParallel-8                 5000000               318 ns/op             440 B/op         10 allocs/op
BenchmarkStructFilteredSuccess-8                                 2000000               597 ns/op             288 B/op          9 allocs/op
BenchmarkStructFilteredSuccessParallel-8                        10000000               266 ns/op             288 B/op          9 allocs/op
BenchmarkStructFilteredFailure-8                                 3000000               454 ns/op             256 B/op          7 allocs/op
BenchmarkStructFilteredFailureParallel-8                        10000000               214 ns/op             256 B/op          7 allocs/op
BenchmarkStructPartialSuccess-8                                  3000000               502 ns/op             256 B/op          6 allocs/op
BenchmarkStructPartialSuccessParallel-8                         10000000               225 ns/op             256 B/op          6 allocs/op
BenchmarkStructPartialFailure-8                                  2000000               702 ns/op             480 B/op         11 allocs/op
BenchmarkStructPartialFailureParallel-8                          5000000               329 ns/op             480 B/op         11 allocs/op
BenchmarkStructExceptSuccess-8                                   2000000               793 ns/op             496 B/op         12 allocs/op
BenchmarkStructExceptSuccessParallel-8                          10000000               193 ns/op             240 B/op          5 allocs/op
BenchmarkStructExceptFailure-8                                   2000000               639 ns/op             464 B/op         10 allocs/op
BenchmarkStructExceptFailureParallel-8                           5000000               300 ns/op             464 B/op         10 allocs/op
BenchmarkStructSimpleCrossFieldSuccess-8                         3000000               417 ns/op              72 B/op          3 allocs/op
BenchmarkStructSimpleCrossFieldSuccessParallel-8                10000000               163 ns/op              72 B/op          3 allocs/op
BenchmarkStructSimpleCrossFieldFailure-8                         2000000               645 ns/op             304 B/op          8 allocs/op
BenchmarkStructSimpleCrossFieldFailureParallel-8                 5000000               285 ns/op             304 B/op          8 allocs/op
BenchmarkStructSimpleCrossStructCrossFieldSuccess-8              3000000               588 ns/op              80 B/op          4 allocs/op
BenchmarkStructSimpleCrossStructCrossFieldSuccessParallel-8     10000000               221 ns/op              80 B/op          4 allocs/op
BenchmarkStructSimpleCrossStructCrossFieldFailure-8              2000000               868 ns/op             320 B/op          9 allocs/op
BenchmarkStructSimpleCrossStructCrossFieldFailureParallel-8      5000000               337 ns/op             320 B/op          9 allocs/op
BenchmarkStructSimpleSuccess-8                                   5000000               260 ns/op               0 B/op          0 allocs/op
BenchmarkStructSimpleSuccessParallel-8                          20000000                90.6 ns/op             0 B/op          0 allocs/op
BenchmarkStructSimpleFailure-8                                   2000000               619 ns/op             424 B/op          9 allocs/op
BenchmarkStructSimpleFailureParallel-8                           5000000               296 ns/op             424 B/op          9 allocs/op
BenchmarkStructComplexSuccess-8                                  1000000              1454 ns/op             128 B/op          8 allocs/op
BenchmarkStructComplexSuccessParallel-8                          3000000               579 ns/op             128 B/op          8 allocs/op
BenchmarkStructComplexFailure-8                                   300000              4140 ns/op            3041 B/op         53 allocs/op
BenchmarkStructComplexFailureParallel-8                          1000000              2127 ns/op            3041 B/op         53 allocs/op
BenchmarkOneof-8                                                10000000               140 ns/op               0 B/op          0 allocs/op
BenchmarkOneofParallel-8                                        20000000                70.1 ns/op             0 B/op          0 allocs/op

Here is a list of software that complements using this library either pre or post validation.

form - Decodes url.Values into Go value(s) and Encodes Go value(s) into url.Values. Dual Array and Full map support.
mold - A general library to help modify or set data within data structures and other objects

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Distributed under MIT License, please see license file within the code for more details.

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