Introduction
Advanced features available for Developer edition devices.
As outlined in our open source firmware, TRMNL exposes a GET endpoint that responds with image and other content for your device to store or render.
GET /api/display
# request headers example
{
'ID' => 'XX:XX:XX:XX',
'Access-Token' => '2r--SahjsAKCFksVcped2Q'
}
# response body example
{
"image_url"=>"https://trmnl.s3.us-east-2.amazonaws.com/path-to-img.bmp",
"filename"=>"2025-05-10-plugin-T00:00:00",
"update_firmware"=>false
}
With a device's API key you can request content without a TRMNL device or TRMNL firmware.
In the following Private API docs we'll outline a few ways to take advantage of this information for your own privacy, security, and experimentation purposes.
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