If the content-type of the response is application/ld+json, it can't highlight the data in Pretty mode. Here is the response headers: server nginx/1.23.4 content-type application/ld+json; charset=utf-8 transfer-encoding chunked connection keep-alive vary Accept x-content-type-options nosniff x-frame-options deny cache-control no-cache, private date Thu, 29 Aug 2024 06:16:14 GMT link <http://localhost:8887/api/docs.jsonld>; rel="http://www.w3.org/ns/hydra/core#apiDocumentation" etag "b0c5fe840962460dae8db776ca286a62" x-debug-token 8f860b x-debug-token-link http://localhost:8887/_profiler/8f860b x-robots-tag noindex References: https://json-ld.org/ http://www.w3.org/ns/hydra/core#apiDocumentation