$nor

Definition

Negates a disjunction.

Expression operator · Logic · Studio Visual: not exposed. Studio validates the complete expression separately.

Syntax

{ "$nor": [ <expression>, ... ] }

Replace angle-bracket placeholders with expressions or values.

Optional parameters may be omitted.

Parameters

Parameter	Required	Description
expression	See argument count below	Expression to evaluate as a condition.

Arguments are positional: keep the order shown. Supply 0 or more arguments.

Behavior

The following observations use the example expression below. Each row substitutes one argument while retaining the other example arguments. A missing field differs from an explicit null; the result shown is what Core actually returned.

For the expression argument:

Input case	Supplied value	Result
null	null	true
missing	Field absent	true
decimal	2.5	true
numeric string	"12"	true
text	"hello"	true
boolean	true	false
typed date	{"$date":"2026-01-15T15:00:00Z"}	true
empty array	[]	true
numeric array	[1,2,3]	true
object	{"x":1}	true
null	null	false
missing	Field absent	false
decimal	2.5	false
numeric string	"12"	false
text	"hello"	false
boolean	true	false
typed date	{"$date":"2026-01-15T15:00:00Z"}	false
empty array	[]	false
numeric array	[1,2,3]	false
object	{"x":1}	false

Argument handling

Invocation	Result
{"$nor":[]}	true
{"$nor":{"unexpected":1}}	Error — class org.bson.Document cannot be cast to class java.util.List (org.bson.Document is in unnamed module of loader 'app'; java.util.List is in module java.base of loader 'bootstrap')

Examples

Expression:

{
  "$nor": [
    true,
    false
  ]
}

Input document:

{}

Observed SrotaX result: false.

Detailed input cases

Expand the complete argument-by-argument test matrix

Each table changes only the indicated argument from the example above. Other arguments retain their baseline values. Values normally come from the input field probe; literal configuration arguments are replaced directly. “Missing” means the field is absent, not explicitly null. Numeric strings are strings, not numbers.

Argument: expression[0]

Input case	Supplied value	SrotaX result
null	null	true
missing	Field absent	true
zero	0	true
negative	-2	true
decimal	2.5	true
numeric string	"12"	true
text	"hello"	true
empty string	""	true
boolean	true	false
false	false	true
typed date	{"$date":"2026-01-15T15:00:00Z"}	true
decimal128	{"$numberDecimal":"1.25"}	true
empty array	[]	true
numeric array	[1,2,3]	true
mixed array	[1,null,"x",3]	true
nested array	[[1,2],[3]]	true
empty object	{}	true
object	{"x":1}	true
ISO date string	"2026-01-15T15:00:00Z"	true

Argument: expression[1]

Input case	Supplied value	SrotaX result
null	null	false
missing	Field absent	false
zero	0	false
negative	-2	false
decimal	2.5	false
numeric string	"12"	false
text	"hello"	false
empty string	""	false
boolean	true	false
false	false	false
typed date	{"$date":"2026-01-15T15:00:00Z"}	false
decimal128	{"$numberDecimal":"1.25"}	false
empty array	[]	false
numeric array	[1,2,3]	false
mixed array	[1,null,"x",3]	false
nested array	[[1,2],[3]]	false
empty object	{}	false
object	{"x":1}	false
ISO date string	"2026-01-15T15:00:00Z"	false

Verification

This page records 41 executed cases. It covers individual argument substitutions, not every cross-product of arguments, locale, daylight-saving transitions, numeric overflow, collation or resource limits. No untested behavior is guaranteed.

Download exact expressions, inputs and SrotaX results. Errors are observed messages, not stable public error codes. The reference generator reads the checked-in execution report; do not edit generated observations by hand.

MongoDB differences

This name is a SrotaX extension or belongs to another MongoDB context. It is not compared as a MongoDB aggregation expression. This is not a missing implementation failure.