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-9.3.0-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 MacBook Pro (Retina, 15-inch, Late 2013) 2.6 GHz Intel Core i7 16 GB 1600 MHz DDR3 using Go version go1.7.1 darwin/amd64 ```go BenchmarkFieldSuccess-8 20000000 106 ns/op BenchmarkFieldSuccessParallel-8 50000000 33.7 ns/op BenchmarkFieldFailure-8 5000000 346 ns/op BenchmarkFieldFailureParallel-8 20000000 115 ns/op BenchmarkFieldDiveSuccess-8 2000000 739 ns/op BenchmarkFieldDiveSuccessParallel-8 10000000 246 ns/op BenchmarkFieldDiveFailure-8 1000000 1043 ns/op BenchmarkFieldDiveFailureParallel-8 5000000 381 ns/op BenchmarkFieldCustomTypeSuccess-8 5000000 270 ns/op BenchmarkFieldCustomTypeSuccessParallel-8 20000000 92.5 ns/op BenchmarkFieldCustomTypeFailure-8 5000000 331 ns/op BenchmarkFieldCustomTypeFailureParallel-8 20000000 132 ns/op BenchmarkFieldOrTagSuccess-8 2000000 874 ns/op BenchmarkFieldOrTagSuccessParallel-8 5000000 368 ns/op BenchmarkFieldOrTagFailure-8 3000000 566 ns/op BenchmarkFieldOrTagFailureParallel-8 5000000 427 ns/op BenchmarkStructLevelValidationSuccess-8 5000000 335 ns/op BenchmarkStructLevelValidationSuccessParallel-8 20000000 124 ns/op BenchmarkStructLevelValidationFailure-8 2000000 630 ns/op BenchmarkStructLevelValidationFailureParallel-8 10000000 298 ns/op BenchmarkStructSimpleCustomTypeSuccess-8 3000000 535 ns/op BenchmarkStructSimpleCustomTypeSuccessParallel-8 10000000 170 ns/op BenchmarkStructSimpleCustomTypeFailure-8 2000000 821 ns/op BenchmarkStructSimpleCustomTypeFailureParallel-8 5000000 379 ns/op BenchmarkStructFilteredSuccess-8 2000000 769 ns/op BenchmarkStructFilteredSuccessParallel-8 5000000 328 ns/op BenchmarkStructFilteredFailure-8 2000000 594 ns/op BenchmarkStructFilteredFailureParallel-8 10000000 244 ns/op BenchmarkStructPartialSuccess-8 2000000 682 ns/op BenchmarkStructPartialSuccessParallel-8 5000000 291 ns/op BenchmarkStructPartialFailure-8 1000000 1034 ns/op BenchmarkStructPartialFailureParallel-8 5000000 392 ns/op BenchmarkStructExceptSuccess-8 1000000 1014 ns/op BenchmarkStructExceptSuccessParallel-8 10000000 257 ns/op BenchmarkStructExceptFailure-8 2000000 875 ns/op BenchmarkStructExceptFailureParallel-8 5000000 405 ns/op BenchmarkStructSimpleCrossFieldSuccess-8 3000000 545 ns/op BenchmarkStructSimpleCrossFieldSuccessParallel-8 10000000 177 ns/op BenchmarkStructSimpleCrossFieldFailure-8 2000000 787 ns/op BenchmarkStructSimpleCrossFieldFailureParallel-8 5000000 341 ns/op BenchmarkStructSimpleCrossStructCrossFieldSuccess-8 2000000 795 ns/op BenchmarkStructSimpleCrossStructCrossFieldSuccessParallel-8 10000000 267 ns/op BenchmarkStructSimpleCrossStructCrossFieldFailure-8 1000000 1119 ns/op BenchmarkStructSimpleCrossStructCrossFieldFailureParallel-8 3000000 437 ns/op BenchmarkStructSimpleSuccess-8 5000000 377 ns/op BenchmarkStructSimpleSuccessParallel-8 20000000 110 ns/op BenchmarkStructSimpleFailure-8 2000000 785 ns/op BenchmarkStructSimpleFailureParallel-8 5000000 302 ns/op BenchmarkStructComplexSuccess-8 1000000 2159 ns/op BenchmarkStructComplexSuccessParallel-8 2000000 723 ns/op BenchmarkStructComplexFailure-8 300000 5237 ns/op BenchmarkStructComplexFailureParallel-8 1000000 2378 ns/op ``` Complimentary Software ---------------------- Here is a list of software that compliments 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 in code for more details.