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# json-schema-migrate
Migrate JSON-Schema from draft-04 to draft-07, draft-2019-09 or draft-2020-12
[](https://github.com/ajv-validator/json-schema-migrate/actions?query=workflow%3Abuild)
[](https://www.npmjs.com/package/json-schema-migrate)
[](https://coveralls.io/github/ajv-validator/json-schema-migrate?branch=master)
## Install
```
npm install json-schema-migrate
```
## Usage
```javascript
const migrate = require("json-schema-migrate")
const schema = {
id: "my-schema",
minimum: 1,
exclusiveMinimum: true,
}
migrate.draft7(schema)
// or migrate.draft2019(schema)
// or migrate.draft2020(schema)
console.log(schema)
// {
// $id: 'my-schema',
// exclusiveMinimum: 1
// }
```
You can access Ajv instance that is used to migrate schema using `migrate.getAjv` function:
```javascript
console.log(migrate.getAjv().errorsText(errors))
```
## Changes in schemas after migration
- `id` is replaced with `$id`
- `$schema` value becomes draft-07, draft-2019-09 or draft-2020-12 meta-schema
- draft-04 boolean form of `exclusiveMaximum/Minimum` is replaced with the current number form
- `enum` with a single allowed value is replaced with `const`
- Non-standard `constant` is replaced with `const`
- empty schema is replaced with `true`
- schema `{"not":{}}` is replaced with `false`
- `draft2019` function additionally replaces:
- `definitions` with `$defs`
- `dependencies` with `dependentRequired` and `dependentSchemas`
- `"id": "#foo"` with `"$anchor": "foo"`
- `"id": "schema#foo"` with `"$id": "schema", "$anchor": "foo"`
- `draft2020` function additionally replaces array form of `items` with `prefixItems` (and `additionalItems` with `items`)
## License
[MIT](https://github.com/epoberezkin/json-schema-migrate/blob/master/LICENSE)