# Add a layer to display custom data from GeoJSON file In this example, we will create a custom layer that fetches GeoJSON data from a file. It will display on top of all other layers. The GeoJSON file for this example is located at this URL: [link](https://data.montreal.ca/dataset/ab112a84-0661-4360-9573-652eed16beeb/resource/a90678ac-7ea7-464c-b615-e8f5cb9f527b/download/rsqa_secteurs.geojson). ## Example Try it out in [Codepen.io](https://codepen.io/k2-dev/pen/PoEPWZo?editors=1000) ```html

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