d3 | JSON data to tree layout

Aim

Produce a tree layout that will display json data from spreedsheet data

ROOT  
       |   
       ·―― A  
       |   |  
       |   ·―― A 01  
       |   |  
       |   ·―― A 02  
       |   |  
       |   ·―― A 03  
       |   |  
       |   ·―― A 04  
       |   |  
       |   ·―― A 05  
       |  
       ·―― B  
       |   |  
       |   ·―― B 01  
       |   |  
       |   ·―― B 02  
       |   |  
       |   ·―― B 02.1  
       |   |  
       |   ·―― B 02.2  
       |   |  
       |   ·―― B 02.3  
       |   |  
       |   ·―― B 02.4  
       |   |  
       |   ·―― B 03  
       |   |  
       |   ·―― B 04  
       |   |  
       |   ·―― B 05  
       |   |  
       ·―― C   
       |   |  
       |   ·―― C 01  
       |   |  
       |   ·―― C 01.1  
       |   |  
       |   ·―― C 01.2  
       |   |  
       |   ·―― C 01.3  
       |   |  
       |   ·―― C 01.4  
       |   |  
       |   ·―― C 01.5  
       |   |  
       ·―― D   
       |   | 
           ·―― D 01  
           |  
           ·―― D 02  
           |  
           ·―― D 03  
               |  
               ·―― D 03.1  
               |  
               ·―― D 03.2  

Info and sources

Based on From tree to cluster and radial projectionn

Collapsible Tree