apoc.map.flatten
Function

Details
Syntax	`apoc.map.flatten(map [, delimiter ])`
Description	Flattens nested items in the given `MAP`. This function is the reverse of the `apoc.map.unflatten` function.
Arguments	Name	Type	Description
	`map`	`MAP`	A nested map to flatten.
	`delimiter`	`STRING`	The delimiter used to separate the levels of the flattened map. The default is: `.`.
Returns	`MAP`

Usage Examples

The following flattens a nested map using the default . delimiter:

RETURN apoc.map.flatten({
  person: {
    name: "Cristiano Ronaldo",
    club: {
      name: "Juventus",
      founded: 1897
    }
  }
}) AS output;

Results
Output
`{ "person.name": "Cristiano Ronaldo", "person.club.founded": 1897, "person.club.name": "Juventus" }`

The following flattens a nested map using the / delimiter:

RETURN apoc.map.flatten({
  person: {
    name: "Cristiano Ronaldo",
    club: {
      name: "Juventus",
      founded: 1897
    }
  }
}, "/") AS output;

Results
Output
`{ "person/club/name": "Juventus", "person/club/founded": 1897, "person/name": "Cristiano Ronaldo" }`