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https://github.com/cardinalby/schema-validator-action

JSON Schema validator Action
https://github.com/cardinalby/schema-validator-action

json-schema schema schemasafe validation validator yaml

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JSON Schema validator Action

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## Validate JSON or YAML against a schema



A GitHub Action for validating JSON or YAML file against a schema. 

Fails if validation doesn't succeed. Uses 

[schemasafe](https://github.com/ExodusMovement/schemasafe) validator under the hood.



## Examples



```yaml

- name: Validate package.json against a local schema

  uses: cardinalby/schema-validator-action@v3

  with:

    file: 'package.json'

    schema: 'schemas/package.schema.json'

```



```yaml

- name: Validate action.yml against a remote schema

  uses: cardinalby/schema-validator-action@v3

  with:

    file: 'action.yml'

    schema: 'https://json.schemastore.org/github-action.json'

```



```yaml

- name: Validate all json files using their own $schema properties

  uses: cardinalby/schema-validator-action@v3

  with:

    file: 'dir/*.json'

```



```yaml

- name: Validate 3 files using the same schema

  uses: cardinalby/schema-validator-action@v3

  with:

    file: 'first.json|second.json|third.json'

    schema: 'https://json.schemastore.org/swagger-2.0.json'

```



## Basic inputs



### 🔻 `file` **Required**

Path to the JSON or YAML file to be validated.



* Can accept a _glob_ pattern (will validate all matched files)

* Can accept multiple files (or glob patterns) separated by `|` symbol.



### 🔸 `schema`

Path or URL to JSON or YAML file with a schema to validate against.



**Can be empty** if all validated files contain valid `$schema` property.

Input value has a priority over `$schema` property in file if both present. 



### 🔸 `mode` _default value: "default"_

Sets the strictness of the schema compiling. Possible values:

- `lax`: the most relaxed mode

- `spec`: mode is the same as 'lax' but also disables format assertion in draft2019-09 and newer $schema versions

- `default`: used **by default**, doesn't allow unknown keywords and unreachable checks to be present in the schema 

- `strong`: the most strict mode



Read details in [schemasafe documentation](https://github.com/ExodusMovement/schemasafe/blob/master/doc/Options.md).



### 🔸 `fixSchema` _experimental, default value: "false"_

If `true`, tries to fix schema by stripping non-default "format" instructions to make it valid for the

underlying library.



This input is **experimental**, and it's behaviour can be changed in future versions.



## Advanced inputs



### 🔸 `fileParser` _default value: "auto"_

Determines the way files will be parsed (as JSON or as YAML). Possible values:

- `auto` (default) - based on file extension (_json/yml/yaml_). It means, _.json_ files containing 

yaml will lead to error. If file extension is unknown, it will behave as `json|yaml` option

- `json` - parse all files as JSON

- `yaml` - parse all files as YAML

- `json|yaml` - try to parse files both with json and yaml parser (compatible with _v2_)



### 🔸 `refSchemasMap`

Contains a JSON object with the schemas needed to resolve external `$ref`s in the main schema. 

JSON object should contain pairs of:

 - key: id of the external schema

 - value: path to schema file or URL to download schema from



Example: `{"https://my-schemas.com/schema-id": "schema_files/my.schema.json"}`



### 🔸 `refSchemasArray`

Contains a JSON array with the schemas needed to resolve external `$ref`s in the main schema.

JSON array should contain string elements, each pointing to schema file path or URL to download schema from.



All schemas should contain `$id` (or `id` for draft-04) property to be identified.



This input is more convenient alternative for `refSchemasMap` input if all external schemas

contain `$id` property.



Example: `["schema_files/my.schema.json"]`



## Outputs



### 🔹 `errorType`

Is empty if validation succeeds.

* `file`: file loading or parsing failed

* `schema`: schema loading, parsing or refs resolving failed

* `validation`: file data doesn't correspond schema



In case of multiple files they are processed one by one and `errorType` indicates the first error occurred.