import bpy
import bmesh
import json

bpy.data.objects['Cube'].select = True
bpy.ops.object.mode_set(mode='EDIT')

m = bpy.data.meshes['Cube']
b = bmesh.from_edit_mesh(m)

print("info:")

data = {}
print("verts:")
for vert in b.verts:
    print(" ", vert.index, ":", list(vert.co))
data['vertices'] = [list(vert.co) for vert in b.verts]

print("edges for vert:")
for vert in b.verts:
    print("  ", vert.index, ":", [e.index for e in vert.link_edges])
print("faces for vert:")
for vert in b.verts:
    print("  ", vert.index, ":", [e.index for e in vert.link_faces])

print("edges:")
edges = []
for edge in b.edges:
    print(" ", edge.index, ":", [v.index for v in edge.verts])
    edges.append([v.index for v in edge.verts])
data['edges'] = edges

print("faces for edge:")
for edge in b.edges:
    print("  ", edge.index, ":", [f.index for f in edge.link_faces])


print("faces:")
faces = []
for face in b.faces:
    print(" ", face.index, ":", [v.index for v in face.verts])
    faces.append([v.index for v in face.verts])
data['faces'] = faces

print("edges for face:")
for face in b.faces:
    print("  ", face.index, ":", [e.index for e in face.edges])


print(json.dumps(data))