Skip to content

$strcasecmp

Definition

Compares lower-cased strings.

Expression operator · Text · Studio Visual: available. Studio validates the complete expression separately.

Syntax

{ "$strcasecmp": [ <left>, <right> ] }

Replace angle-bracket placeholders with expressions or values.

Optional parameters may be omitted.

Parameters

Parameter Required Description
left Yes First expression in the ordered argument list.
right Yes Second expression in the ordered argument list.

Arguments are positional: keep the order shown. The authoring signature accepts 2–2 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 left argument:

Input case Supplied value Result
null null Error — $strcasecmp expects two strings
missing Field absent Error — $strcasecmp expects two strings
decimal 2.5 Error — $strcasecmp expects two strings
numeric string "12" -50 (int32)
text "hello" 5 (int32)
boolean true Error — $strcasecmp expects two strings
typed date {"$date":"2026-01-15T15:00:00Z"} Error — $strcasecmp expects two strings
empty array [] Error — $strcasecmp expects two strings
numeric array [1,2,3] Error — $strcasecmp expects two strings
object {"x":1} Error — $strcasecmp expects two strings

Argument handling

Invocation Result
{"$strcasecmp":[]} Error — $strcasecmp expects [string1, string2]
{"$strcasecmp":{"unexpected":1}} Error — $strcasecmp expects [string1, string2]

Examples

Expression: 

{
  "$strcasecmp": [
    "CA",
    "ca"
  ]
}

Input document: 

{}

Observed SrotaX result: 0 (int32).

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: left[0]

Input case Supplied value SrotaX result
null null Error — $strcasecmp expects two strings
missing Field absent Error — $strcasecmp expects two strings
zero 0 Error — $strcasecmp expects two strings
negative -2 Error — $strcasecmp expects two strings
decimal 2.5 Error — $strcasecmp expects two strings
numeric string "12" -50 (int32)
text "hello" 5 (int32)
empty string "" -2 (int32)
boolean true Error — $strcasecmp expects two strings
false false Error — $strcasecmp expects two strings
typed date {"$date":"2026-01-15T15:00:00Z"} Error — $strcasecmp expects two strings
decimal128 {"$numberDecimal":"1.25"} Error — $strcasecmp expects two strings
empty array [] Error — $strcasecmp expects two strings
numeric array [1,2,3] Error — $strcasecmp expects two strings
mixed array [1,null,"x",3] Error — $strcasecmp expects two strings
nested array [[1,2],[3]] Error — $strcasecmp expects two strings
empty object {} Error — $strcasecmp expects two strings
object {"x":1} Error — $strcasecmp expects two strings
ISO date string "2026-01-15T15:00:00Z" -49 (int32)

Argument: right[1]

Input case Supplied value SrotaX result
null null Error — $strcasecmp expects two strings
missing Field absent Error — $strcasecmp expects two strings
zero 0 Error — $strcasecmp expects two strings
negative -2 Error — $strcasecmp expects two strings
decimal 2.5 Error — $strcasecmp expects two strings
numeric string "12" 50 (int32)
text "hello" -5 (int32)
empty string "" 2 (int32)
boolean true Error — $strcasecmp expects two strings
false false Error — $strcasecmp expects two strings
typed date {"$date":"2026-01-15T15:00:00Z"} Error — $strcasecmp expects two strings
decimal128 {"$numberDecimal":"1.25"} Error — $strcasecmp expects two strings
empty array [] Error — $strcasecmp expects two strings
numeric array [1,2,3] Error — $strcasecmp expects two strings
mixed array [1,null,"x",3] Error — $strcasecmp expects two strings
nested array [[1,2],[3]] Error — $strcasecmp expects two strings
empty object {} Error — $strcasecmp expects two strings
object {"x":1} Error — $strcasecmp expects two strings
ISO date string "2026-01-15T15:00:00Z" 49 (int32)

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

Compared with MongoDB 9.0.4: 1 exact BSON matches, 18 both rejected, 22 value/type/acceptance differences, 0 object-field-order differences.

“Exact” includes numeric BSON types and object key order. A value of 3 as int32 differs from 3.0 as double. Object-field-order differences are reported separately; object key ordering is not enforced by the engine regression baseline. Both rejected does not mean the error codes or messages match. This is finite-case evidence, not full compatibility certification.

Show observed differences
Tested case SrotaX MongoDB
left[0] / null Error — $strcasecmp expects two strings -1 (int32)
left[0] / missing Error — $strcasecmp expects two strings -1 (int32)
left[0] / zero Error — $strcasecmp expects two strings -1 (int32)
left[0] / negative Error — $strcasecmp expects two strings -1 (int32)
left[0] / decimal Error — $strcasecmp expects two strings -1 (int32)
left[0] / numeric string -50 (int32) -1 (int32)
left[0] / text 5 (int32) 1 (int32)
left[0] / empty string -2 (int32) -1 (int32)
left[0] / typed date Error — $strcasecmp expects two strings -1 (int32)
left[0] / decimal128 Error — $strcasecmp expects two strings -1 (int32)
left[0] / ISO date string -49 (int32) -1 (int32)
right[1] / null Error — $strcasecmp expects two strings 1 (int32)
right[1] / missing Error — $strcasecmp expects two strings 1 (int32)
right[1] / zero Error — $strcasecmp expects two strings 1 (int32)
right[1] / negative Error — $strcasecmp expects two strings 1 (int32)
right[1] / decimal Error — $strcasecmp expects two strings 1 (int32)
right[1] / numeric string 50 (int32) 1 (int32)
right[1] / text -5 (int32) -1 (int32)
right[1] / empty string 2 (int32) 1 (int32)
right[1] / typed date Error — $strcasecmp expects two strings 1 (int32)
right[1] / decimal128 Error — $strcasecmp expects two strings 1 (int32)
right[1] / ISO date string 49 (int32) 1 (int32)

Download full comparison evidence.