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-9.4.0-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. - 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 i5-7600 16 GB DDR4-2400 using Go version go1.8 linux/amd64 ```go BenchmarkFieldSuccess-4 20000000 74.3 ns/op 0 B/op 0 allocs/op BenchmarkFieldSuccessParallel-4 50000000 31.5 ns/op 0 B/op 0 allocs/op BenchmarkFieldFailure-4 3000000 556 ns/op 208 B/op 4 allocs/op BenchmarkFieldFailureParallel-4 20000000 88.7 ns/op 208 B/op 4 allocs/op BenchmarkFieldDiveSuccess-4 2000000 630 ns/op 201 B/op 11 allocs/op BenchmarkFieldDiveSuccessParallel-4 10000000 173 ns/op 201 B/op 11 allocs/op BenchmarkFieldDiveFailure-4 1000000 1350 ns/op 412 B/op 16 allocs/op BenchmarkFieldDiveFailureParallel-4 5000000 250 ns/op 412 B/op 16 allocs/op BenchmarkFieldCustomTypeSuccess-4 10000000 202 ns/op 32 B/op 2 allocs/op BenchmarkFieldCustomTypeSuccessParallel-4 20000000 63.5 ns/op 32 B/op 2 allocs/op BenchmarkFieldCustomTypeFailure-4 5000000 568 ns/op 208 B/op 4 allocs/op BenchmarkFieldCustomTypeFailureParallel-4 20000000 87.5 ns/op 208 B/op 4 allocs/op BenchmarkFieldOrTagSuccess-4 2000000 703 ns/op 16 B/op 1 allocs/op BenchmarkFieldOrTagSuccessParallel-4 3000000 447 ns/op 16 B/op 1 allocs/op BenchmarkFieldOrTagFailure-4 3000000 604 ns/op 224 B/op 5 allocs/op BenchmarkFieldOrTagFailureParallel-4 5000000 353 ns/op 224 B/op 5 allocs/op BenchmarkStructLevelValidationSuccess-4 10000000 190 ns/op 32 B/op 2 allocs/op BenchmarkStructLevelValidationSuccessParallel-4 30000000 59.9 ns/op 32 B/op 2 allocs/op BenchmarkStructLevelValidationFailure-4 2000000 705 ns/op 304 B/op 8 allocs/op BenchmarkStructLevelValidationFailureParallel-4 10000000 146 ns/op 304 B/op 8 allocs/op BenchmarkStructSimpleCustomTypeSuccess-4 5000000 361 ns/op 32 B/op 2 allocs/op BenchmarkStructSimpleCustomTypeSuccessParallel-4 20000000 101 ns/op 32 B/op 2 allocs/op BenchmarkStructSimpleCustomTypeFailure-4 1000000 1210 ns/op 424 B/op 9 allocs/op BenchmarkStructSimpleCustomTypeFailureParallel-4 10000000 196 ns/op 440 B/op 10 allocs/op BenchmarkStructFilteredSuccess-4 2000000 757 ns/op 288 B/op 9 allocs/op BenchmarkStructFilteredSuccessParallel-4 10000000 167 ns/op 288 B/op 9 allocs/op BenchmarkStructFilteredFailure-4 3000000 619 ns/op 256 B/op 7 allocs/op BenchmarkStructFilteredFailureParallel-4 10000000 134 ns/op 256 B/op 7 allocs/op BenchmarkStructPartialSuccess-4 2000000 687 ns/op 256 B/op 6 allocs/op BenchmarkStructPartialSuccessParallel-4 10000000 159 ns/op 256 B/op 6 allocs/op BenchmarkStructPartialFailure-4 1000000 1281 ns/op 480 B/op 11 allocs/op BenchmarkStructPartialFailureParallel-4 10000000 218 ns/op 480 B/op 11 allocs/op BenchmarkStructExceptSuccess-4 1000000 1041 ns/op 496 B/op 12 allocs/op BenchmarkStructExceptSuccessParallel-4 10000000 140 ns/op 240 B/op 5 allocs/op BenchmarkStructExceptFailure-4 1000000 1014 ns/op 464 B/op 10 allocs/op BenchmarkStructExceptFailureParallel-4 10000000 201 ns/op 464 B/op 10 allocs/op BenchmarkStructSimpleCrossFieldSuccess-4 5000000 364 ns/op 72 B/op 3 allocs/op BenchmarkStructSimpleCrossFieldSuccessParallel-4 20000000 103 ns/op 72 B/op 3 allocs/op BenchmarkStructSimpleCrossFieldFailure-4 2000000 789 ns/op 304 B/op 8 allocs/op BenchmarkStructSimpleCrossFieldFailureParallel-4 10000000 174 ns/op 304 B/op 8 allocs/op BenchmarkStructSimpleCrossStructCrossFieldSuccess-4 3000000 522 ns/op 80 B/op 4 allocs/op BenchmarkStructSimpleCrossStructCrossFieldSuccessParallel-4 10000000 146 ns/op 80 B/op 4 allocs/op BenchmarkStructSimpleCrossStructCrossFieldFailure-4 2000000 879 ns/op 320 B/op 9 allocs/op BenchmarkStructSimpleCrossStructCrossFieldFailureParallel-4 10000000 225 ns/op 320 B/op 9 allocs/op BenchmarkStructSimpleSuccess-4 10000000 223 ns/op 0 B/op 0 allocs/op BenchmarkStructSimpleSuccessParallel-4 20000000 63.3 ns/op 0 B/op 0 allocs/op BenchmarkStructSimpleFailure-4 2000000 1097 ns/op 424 B/op 9 allocs/op BenchmarkStructSimpleFailureParallel-4 10000000 182 ns/op 424 B/op 9 allocs/op BenchmarkStructComplexSuccess-4 1000000 1362 ns/op 128 B/op 8 allocs/op BenchmarkStructComplexSuccessParallel-4 5000000 359 ns/op 128 B/op 8 allocs/op BenchmarkStructComplexFailure-4 300000 6446 ns/op 3040 B/op 53 allocs/op BenchmarkStructComplexFailureParallel-4 1000000 1203 ns/op 3040 B/op 53 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. * [Conform](https://github.com/leebenson/conform) - Trims, sanitizes & scrubs data based on struct tags. How to Contribute ------ Make a pull request... License ------ Distributed under MIT License, please see license file within the code for more details.