Method json

src/core/HttpResponse.ts:104–138

* Create a `Response` with a `Content-Type: "application/json"` body. * @example * HttpResponse.json({ firstName: 'John' }) * HttpResponse.json({ error: 'Not Authorized' }, { status: 401 })

(
    body?: NoInfer<BodyType> | null | undefined,
    init?: HttpResponseInit,
  )

   * HttpResponse.json({ error: 'Not Authorized' }, { status: 401 })
   */
  static json<BodyType extends JsonBodyType>(
    body?: NoInfer<BodyType> | null | undefined,
    init?: HttpResponseInit,
  ): HttpResponse<BodyType> {
    const responseInit = normalizeResponseInit(init)
    const hasExplicitContentType = responseInit.headers.has('Content-Type')

    if (!hasExplicitContentType) {
      responseInit.headers.set('Content-Type', 'application/json')
    }

    /**
     * @note TypeScript is incorrect here.
     * Stringifying undefined will return undefined.
     */
    const responseText = JSON.stringify(body) as string | undefined

    if (!responseInit.headers.has('Content-Length')) {
      responseInit.headers.set(
        'Content-Length',
        responseText ? new Blob([responseText]).size.toString() : '0',
      )
    }

    const response = new HttpResponse(responseText, responseInit)

    if (!hasExplicitContentType) {
      Object.defineProperty(response, kDefaultContentType, {
        value: true,
        enumerable: false,
      })
    }

    return response as HttpResponse<BodyType>
  }

  /**
   * Create a `Response` with a `Content-Type: "application/xml"` body.