Response body discarded with middleware

Using the below configuration

func StartAndServe() {

    logger := slog.Default()
    port := os.Getenv("PORT")

    slog.Info("Starting server on port", "port", port)
    app := fiber.New()

    group := app.Group("/api")
    group.Use(slogfiber.New(logger))

    group.Get("/lookup/:ipaddress", getGeoInfo)

    err := app.Listen(":" + port)
    if err != nil {
        slog.Error("Error starting server", "error", err)
    }
}

The call to getGeoInfo mapped above returns a simple 3 value JSON object

{
    "city": "Johannesburg",
    "region": "Gauteng",
    "country": "South Africa"
}

from the return call below.

    return c.Status(fiber.StatusOK).JSON(lresp)

With group.Use(slogfiber.New(logger)) included the JSON is truncated from the response and nothing but OK is returned.

Below is the information logged by slogfiber.

2023-09-14T20:13:00.410576+02:00 INF Incoming request time="2023-09-14 20:13:00.410563 +0200 SAST" latency=94.375µs method=GET host=localhost:3000 path=/api/lookup/105.30.58.8 route=/api/lookup/:ipaddress status=200 ip=127.0.0.1 user-agent=insomnia/2023.5.8 referer="" request-id=717e4157-3f6e-4d86-a51c-92e1c7015786

samber / slog-fiber

Response body discarded with middleware #7