Pos

let nodeCoords = []
let edges = []
let nodes = []
for (let i = 0; i < 5; i++) {
    for (let j = 0; j < 5; j++) {
        nodeCoords.push([i, j])
        nodes.push(`${i},${j}`)
        if (i < 4) edges.push([`${i},${j}`, `${i+1},${j}`])
        if (j < 4) edges.push([`${i},${j}`, `${i},${j+1}`])
    }
}

canvas.nodes(nodes).data(nodeCoords).add({
    pos: ([i, j]) => [(i - 2) * 35, (j - 2) * 35],
    fixed: true,
    labels: { 0: { remove: true } }
})

canvas.edges(edges).add()