README.md
# grunt-tv4
[](https://www.npmjs.com/package/grunt-tv4)
[](https://www.npmjs.com/package/grunt-tv4)
[](https://github.com/timbeadle/grunt-tv4)
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[](https://snyk.io/test/github/timbeadle/grunt-tv4)
> Use grunt and [Tiny Validator tv4](https://github.com/geraintluff/tv4) to validate values against [json-schema](http://json-schema.org/) draft v4
## Getting Started
This plugin requires Grunt `>=1.5.0`
If you haven't used [Grunt](http://gruntjs.com/) before, be sure to check out the [Getting Started](http://gruntjs.com/getting-started) guide, as it explains how to create a [Gruntfile](http://gruntjs.com/sample-gruntfile) as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:
```shell
$ npm install grunt-tv4 --save-dev
```
Once the plugin has been installed, it may be enabled inside your Gruntfile with this line of JavaScript:
```js
grunt.loadNpmTasks('grunt-tv4');
```
## The "tv4" task
### Notes
* Uses [Tiny Validator tv4 ](https://github.com/geraintluff/tv4) so schemas must conform to [json-schema draft v4](http://json-schema.org/documentation.html).
* Supports automatically resolution and loading remote references by http via `$ref`.
* To use `$ref` see the [json-schema](http://json-schema.org/) documentation or [this help](http://spacetelescope.github.io/understanding-json-schema/structuring.html).
* For general help with json-schema see this excelent [guide](http://spacetelescope.github.io/understanding-json-schema/) and usable [reference](http://spacetelescope.github.io/understanding-json-schema/reference/index.html).
* Errors formatted by the [tv4-reporter](https://github.com/Bartvds/tv4-reporter) library.
### API change
As of version `v0.2.0` the API was changed to follow the Grunt options- and file-selection conventions. The old pattern (which abused the destination-specifier) is no longer supported. The readme for the previous API can be found [here](https://github.com/timbeadle/grunt-tv4/tree/71ef1726945d05efd5daca29f26cbf4ab09c858e).
The root schema must now to be specified as `options.root`.
### Example
* Demo of version `v0.3.0` output on [travis-ci](https://travis-ci.org/timbeadle/grunt-tv4/jobs/14468920)
### Basic usage
Validate from .json files:
```js
grunt.initConfig({
tv4: {
options: {
root: grunt.file.readJSON('schema/main.json')
},
myTarget: {
src: ['data/*.json']
}
}
})
```
Valdiate values:
```js
grunt.initConfig({
tv4: {
myTarget: {
options: {
root: {
type: 'object',
properties: { ... }
}
},
values: [
{ ... },
{ ... }
]
}
}
})
````
### Advanced usage
```js
grunt.initConfig({
tv4: {
options: {
// specify the main schema, one of:
// - path to json
// - http-url
// - schema object
// - callback that returns one of the above
root: grunt.file.readJSON('schema/main.json'),
// show multiple errors per file (off by default)
multi: true,
// create a new tv4 instance for every target (off by default)
fresh: true,
// add schemas in bulk (each required to have an 'id' property) (can be a callback)
add: [
grunt.file.readJSON('schema/apple.json'),
grunt.file.readJSON('schema/pear.json')
],
// set schemas by URI (can be a callback)
schemas: {
'http://example.com/schema/apple': grunt.file.readJSON('schema/apple.json'),
'http://example.com/schema/pear': grunt.file.readJSON('schema/pear.json')
},
// map of custom formats passed to tv4.addFormat()
formats: {
date: function (data, schema) {
if (typeof data !== 'string' || !dateRegex.test(data)) {
return 'value must be string of the form: YYYY-MM-DD';
}
return null;
}
},
// passed to tv4.validate()
checkRecursive: false,
// passed to tv4.validate()
banUnknownProperties: false,
// passed tv4.language()
language: 'de',
// passed tv4.addLanguage()
languages: {
'de': { ... }
}
},
// load json from disk
myFiles: {
src: ['data/*.json', 'data/fruit/**/*.json']
},
myValues: {
// validate values
values: [
grunt.file.readJSON('data/apple.json'),
grunt.file.readJSON('data/pear.json')
],
},
myValueMap: {
// alternately pass as object and the keys will be used as labels in the reports
values: {
'apple': grunt.file.readJSON('data/apple.json'),
'pear': grunt.file.readJSON('data/pear.json')
},
},
myCallback: {
// alternately pass a function() to return a collection of values (array or object)
values: function() {
return {
'apple': grunt.file.readJSON('data/apple.json'),
'pear': grunt.file.readJSON('data/pear.json')
}
}
}
}
})
```
## History
* See [CHANGELOG](https://github.com/timbeadle/grunt-tv4/blob/main/CHANGELOG.md).
## Contributing
In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using [Grunt](http://gruntjs.com/).