Function isSchemaContext

isSchemaContext(ctx: undefined | JsonValue): boolean

Decide whether a JSON-LD @context denotes schema.org, tolerating every form seen in the wild: http/https, an optional trailing slash, an array of contexts, or an object whose values point at schema.org (e.g. an @vocab).

Parameters

ctx: undefined | JsonValue
The value of a node's @context (any JSON value or undefined).

Returns boolean

true if the context refers to schema.org, otherwise false.

Example

isSchemaContext('https://schema.org');                 // true
isSchemaContext('https://schema.org/');                // true (trailing slash)
isSchemaContext({ '@vocab': 'https://schema.org/' });  // true
isSchemaContext('https://example.com');                // false

Source

export function isSchemaContext(ctx: JsonValue | undefined): boolean {
  if (typeof ctx === 'string') return SCHEMA_CONTEXT_RE.test(ctx);
  if (Array.isArray(ctx)) return ctx.some(isSchemaContext);
  if (isPlainObject(ctx)) {
    // e.g. { "@vocab": "https://schema.org/" } or a prefix map.
    return Object.values(ctx).some((v) => typeof v === 'string' && SCHEMA_CONTEXT_RE.test(v));
  }
  return false;
}