Booleans

boolean applies JSONata truthiness (empty strings, 0, empty arrays/objects are false); not negates it; exists is true for any value that isn't undefined (including null).

booleanBooleans

boolean(value: unknown): boolean

JSONata truthiness: `""`, `0`, `[]` and `{}` are false.

notBooleans

not(value: unknown): boolean

Negated JSONata truthiness.

existsBooleans

exists(value: unknown): boolean

True unless the value is `undefined` (`null` exists).

boolean

boolean(value: unknown): boolean

JSONata truthiness: "", 0, [] and {} are false.

hasBio: boolean(user.bio)

not

not(value: unknown): boolean

Negated JSONata truthiness.

isBlank: not(user.bio)

exists

exists(value: unknown): boolean

True unless the value is undefined (null exists).

wasDeleted: exists(user.deletedAt)

Playground

Mapping✔Playground ↗

input user: { bio: string, tags: string[], deletedAt: null }

map {
  hasBio: boolean(user.bio),
  hasTags: boolean(user.tags),
  isBlank: not(user.bio),
  wasDeleted: exists(user.deletedAt),
}

input user: { bio: string, tags: string[], deletedAt: null } map { hasBio: boolean(user.bio), hasTags: boolean(user.tags), isBlank: not(user.bio), wasDeleted: exists(user.deletedAt), }

Input JSON

{ "bio": "", "tags": ["a"], "deletedAt": null }

{ "bio": "", "tags": ["a"], "deletedAt": null }

Output

{
  "hasBio": false,
  "hasTags": true,
  "isBlank": true,
  "wasDeleted": true
}

inferred type{ hasBio: boolean; hasTags: boolean; isBlank: boolean; wasDeleted: boolean; }