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The $Refs class

When you call the resolve method, the value that gets passed to the callback function (or Promise) is a $Refs object. This same object is accessible via the parser.$refs property of $RefParser objects.

This object is a map of JSON References and their resolved values. It also has several convenient helper methods that make it easy for you to navigate and manipulate the JSON References.

Properties
Methods

circular

  • Type: boolean

This property is true if the schema contains any circular references. You may want to check this property before serializing the dereferenced schema as JSON, since JSON.stringify() does not support circular references by default.

let parser = new $RefParser();
await parser.dereference("my-schema.json");

if (parser.$refs.circular) {
  console.log('The schema contains circular references');
}

paths([types])

  • types (optional) - string (one or more)
    Optionally only return certain types of paths ("file", "http", etc.)

  • Return Value: array of string
    Returns the paths/URLs of all the files in your schema (including the main schema file).

let $refs = await $RefParser.resolve("my-schema.json");

// Get the paths of ALL files in the schema
$refs.paths();

// Get the paths of local files only
$refs.paths("file");

// Get all URLs
$refs.paths("http");

values([types])

  • types (optional) - string (one or more)
    Optionally only return values from certain locations ("file", "http", etc.)

  • Return Value: object
    Returns a map of paths/URLs and their correspond values.

let $refs = await $RefParser.resolve("my-schema.json");

// Get ALL paths & values in the schema
// (this is the same as $refs.toJSON())
let values = $refs.values();

values["schemas/people/Bruce-Wayne.json"];
values["schemas/places.yaml"];
values["http://wayne-enterprises.com/things/batmobile"];

exists($ref)

  • $ref (required) - string
    The JSON Reference path, optionally with a JSON Pointer in the hash

  • Return Value: boolean
    Returns true if the given path exists in the schema; otherwise, returns false

let $refs = await $RefParser.resolve("my-schema.json");

$refs.exists("schemas/places.yaml#/definitions/Gotham-City"); // => true
$refs.exists("schemas/places.yaml#/definitions/Metropolis");  // => false

get($ref)

  • $ref (required) - string
    The JSON Reference path, optionally with a JSON Pointer in the hash

  • Return Value: boolean
    Gets the value at the given path in the schema. Throws an error if the path does not exist.

let $refs = await $RefParser.resolve("my-schema.json");
let value = $refs.get("schemas/people/Bruce-Wayne.json#/properties/address");

set($ref, value)

  • $ref (required) - string
    The JSON Reference path, optionally with a JSON Pointer in the hash

  • value (required)
    The value to assign. Can be anything (object, string, number, etc.)

Sets the value at the given path in the schema. If the property, or any of its parents, don't exist, they will be created.

let $refs = await $RefParser.resolve("my-schema.json");
$refs.set("schemas/people/Bruce-Wayne.json#/properties/favoriteColor/default", "black");