<｜begin▁of▁sentence｜>### Instruction:
Given a binary tree graph with 127 vertices (created as a Graph.Tree with 2 children per node), and after performing hierarchical clustering using the community_edge_betweenness method which returns a VertexDendrogram object, how would you format this dendrogram into a 'json' format in igraph?
### Response:
```python
from igraph import Graph
from igraph import VertexDendrogram

# Create a graph
g = Graph.Tree(127, 2)

# Perform hierarchical clustering
dg = g.community_edge_betweenness()
# Convert the result into a VertexDendrogram
vd = VertexDendrogram(g, dg.as_clustering())

# Now we can format the VertexDendrogram object
formatted_dendrogram = vd.format('json')

print(formatted_dendrogram)
```
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