Package validator ================ [![Join the chat at https://gitter.im/go-playground/validator](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/go-playground/validator?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) ![Project status](https://img.shields.io/badge/version-9.26.0-green.svg) [![Build Status](https://semaphoreci.com/api/v1/joeybloggs/validator/branches/v9/badge.svg)](https://semaphoreci.com/joeybloggs/validator) [![Coverage Status](https://coveralls.io/repos/go-playground/validator/badge.svg?branch=v9&service=github)](https://coveralls.io/github/go-playground/validator?branch=v9) [![Go Report Card](https://goreportcard.com/badge/github.com/go-playground/validator)](https://goreportcard.com/report/github.com/go-playground/validator) [![GoDoc](https://godoc.org/gopkg.in/go-playground/validator.v9?status.svg)](https://godoc.org/gopkg.in/go-playground/validator.v9) ![License](https://img.shields.io/dub/l/vibe-d.svg) 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/v9/_examples/gin-upgrading-overriding) Installation ------------ Use go get. go get gopkg.in/go-playground/validator.v9 Then import the validator package into your own code. import "gopkg.in/go-playground/validator.v9" 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 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 http://godoc.org/gopkg.in/go-playground/validator.v9 for detailed usage docs. ##### Examples: - [Simple](https://github.com/go-playground/validator/blob/v9/_examples/simple/main.go) - [Custom Field Types](https://github.com/go-playground/validator/blob/v9/_examples/custom/main.go) - [Struct Level](https://github.com/go-playground/validator/blob/v9/_examples/struct-level/main.go) - [Translations & Custom Errors](https://github.com/go-playground/validator/blob/v9/_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) Benchmarks ------ ###### Run on MacBook Pro (15-inch, 2017) go version go1.10.2 darwin/amd64 ```go 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 ``` Complementary Software ---------------------- Here is a list of software that complements using this library either pre or post validation. * [form](https://github.com/go-playground/form) - Decodes url.Values into Go value(s) and Encodes Go value(s) into url.Values. Dual Array and Full map support. * [mold](https://github.com/go-playground/mold) - A general library to help modify or set data within data structures and other objects How to Contribute ------ Make a pull request... License ------ Distributed under MIT License, please see license file within the code for more details.