D3 Nest Two Keys, json data format. nest () to group elements in an array into a I am working on a d3. It’s because d3. # nest. nest is one of D3’s data formatting methods. The original JSON appears like this: Grouping and nesting with d3. map for getting a d3. It's a different kind of object. x-api-reference development by creating an account on GitHub. 21,122. vzau0juomizukn1p4la7yrvkqaz9nsaxuvvgkohpjjbd