How to debug UVs exported straight from Blender

Question

I have a model in Blender 2.93. I am exporting it to JSON using landon I am then importing the JSON into a WebGL rendering layer and feeding directly to shaders

The JSON UV export is an array of floats between 0 and 1

The shaders look like:

vert:

       precision mediump float;
       attribute vec3 position;
       uniform mat4 model, view, projection;
       attribute vec2 uvs;
       varying vec2 vUv;
       void main() {
          vUv = uvs;
          gl_Position = projection * view * model * vec4(position, 1);
       }

frag:

      precision mediump float;
      varying vec2 vUv;
      uniform sampler2D tex;
      void main() {
         gl_FragColor = texture2D(tex,vUv);
      }

The model in blender looks like:

The model imported in the engine looks like:

I need ideas for next steps to debug the the UV issue with the texture. The texture seems to load okay but the UVS are off. Is there some conversion step from blender I'm over looking?

Update #1:

per @DMGregory in the comments updating the vertex shader to the gl_Position = vec4(uvs.xy * 2.0 - 1.0, 0.0, 1.0)

The engine UVS looks like the following:

We can compare this to the UV Mapping from blender:

Update #2 Model loading:

I am using the regl webgl frame work to load the model data. The UVS are in a flat 1D JSON Array and get bound to the shaders as an regl attribute

Here is example JSON of the model: https://gist.github.com/kevzettler/648cb509d8f4f5a383696449eced96a2