$endsWith
Definition
Checks a literal text suffix.
Expression operator · Text · Studio Visual: not exposed. Studio validates the complete expression separately.
Syntax
{ "$endsWith": [ <input>, <text> ] }
Replace angle-bracket placeholders with expressions or values.
Optional parameters may be omitted.
Parameters
| Parameter | Required | Description |
|---|---|---|
input |
Yes | Expression supplying the value to process. A field reference such as "$price" reads from the current document. |
text |
Yes | Expression supplying the text value. |
Arguments are positional: keep the order shown. The authoring signature accepts 2–2 arguments.
Behavior
The following observations use the example expression below. Each row substitutes one argument while retaining the other example arguments. A missing field differs from an explicit null; the result shown is what Core actually returned.
For the input argument:
| Input case | Supplied value | Result |
|---|---|---|
| null | null | Error — Cannot invoke "String.endsWith(String)" because "input" is null |
| missing | Field absent | Error — Cannot invoke "String.endsWith(String)" because "input" is null |
| decimal | 2.5 | Error — class java.lang.Double cannot be cast to class java.lang.String (java.lang.Double and java.lang.String are in module java.base of loader 'bootstrap') |
| numeric string | "12" | false |
| text | "hello" | false |
| boolean | true | Error — class java.lang.Boolean cannot be cast to class java.lang.String (java.lang.Boolean and java.lang.String are in module java.base of loader 'bootstrap') |
| typed date | {"$date":"2026-01-15T15:00:00Z"} | Error — class java.util.Date cannot be cast to class java.lang.String (java.util.Date and java.lang.String are in module java.base of loader 'bootstrap') |
| empty array | [] | Error — class java.util.ArrayList cannot be cast to class java.lang.String (java.util.ArrayList and java.lang.String are in module java.base of loader 'bootstrap') |
| numeric array | [1,2,3] | Error — class java.util.ArrayList cannot be cast to class java.lang.String (java.util.ArrayList and java.lang.String are in module java.base of loader 'bootstrap') |
| object | {"x":1} | Error — class org.bson.Document cannot be cast to class java.lang.String (org.bson.Document is in unnamed module of loader 'app'; java.lang.String is in module java.base of loader 'bootstr |
Argument handling
| Invocation | Result |
|---|---|
| {"$endsWith":[]} | Error — $endsWith expects [string, suffix] |
| {"$endsWith":{"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:
{
"$endsWith": [
"abc",
"c"
]
}
Input document:
{}
Observed SrotaX result: true.
Detailed input cases
Expand the complete argument-by-argument test matrix
Each table changes only the indicated argument from the example above. Other arguments retain their baseline values. Values normally come from the input field probe; literal configuration arguments are replaced directly. “Missing” means the field is absent, not explicitly null. Numeric strings are strings, not numbers.
Argument: input[0]
| Input case | Supplied value | SrotaX result |
|---|---|---|
| null | null | Error — Cannot invoke "String.endsWith(String)" because "input" is null |
| missing | Field absent | Error — Cannot invoke "String.endsWith(String)" because "input" is null |
| zero | 0 | Error — class java.lang.Integer cannot be cast to class java.lang.String (java.lang.Integer and java.lang.String are in module java.base of loader 'bootstrap') |
| negative | -2 | Error — class java.lang.Integer cannot be cast to class java.lang.String (java.lang.Integer and java.lang.String are in module java.base of loader 'bootstrap') |
| decimal | 2.5 | Error — class java.lang.Double cannot be cast to class java.lang.String (java.lang.Double and java.lang.String are in module java.base of loader 'bootstrap') |
| numeric string | "12" | false |
| text | "hello" | false |
| empty string | "" | false |
| boolean | true | Error — class java.lang.Boolean cannot be cast to class java.lang.String (java.lang.Boolean and java.lang.String are in module java.base of loader 'bootstrap') |
| false | false | Error — class java.lang.Boolean cannot be cast to class java.lang.String (java.lang.Boolean and java.lang.String are in module java.base of loader 'bootstrap') |
| typed date | {"$date":"2026-01-15T15:00:00Z"} | Error — class java.util.Date cannot be cast to class java.lang.String (java.util.Date and java.lang.String are in module java.base of loader 'bootstrap') |
| decimal128 | {"$numberDecimal":"1.25"} | Error — class org.bson.types.Decimal128 cannot be cast to class java.lang.String (org.bson.types.Decimal128 is in unnamed module of loader 'app'; java.lang.String is in module java.base of |
| empty array | [] | Error — class java.util.ArrayList cannot be cast to class java.lang.String (java.util.ArrayList and java.lang.String are in module java.base of loader 'bootstrap') |
| numeric array | [1,2,3] | Error — class java.util.ArrayList cannot be cast to class java.lang.String (java.util.ArrayList and java.lang.String are in module java.base of loader 'bootstrap') |
| mixed array | [1,null,"x",3] | Error — class java.util.ArrayList cannot be cast to class java.lang.String (java.util.ArrayList and java.lang.String are in module java.base of loader 'bootstrap') |
| nested array | [[1,2],[3]] | Error — class java.util.ArrayList cannot be cast to class java.lang.String (java.util.ArrayList and java.lang.String are in module java.base of loader 'bootstrap') |
| empty object | {} | Error — class org.bson.Document cannot be cast to class java.lang.String (org.bson.Document is in unnamed module of loader 'app'; java.lang.String is in module java.base of loader 'bootstr |
| object | {"x":1} | Error — class org.bson.Document cannot be cast to class java.lang.String (org.bson.Document is in unnamed module of loader 'app'; java.lang.String is in module java.base of loader 'bootstr |
| ISO date string | "2026-01-15T15:00:00Z" | false |
Argument: text[1]
| Input case | Supplied value | SrotaX result |
|---|---|---|
| null | null | Error — Cannot invoke "String.length()" because "suffix" is null |
| missing | Field absent | Error — Cannot invoke "String.length()" because "suffix" is null |
| zero | 0 | Error — class java.lang.Integer cannot be cast to class java.lang.String (java.lang.Integer and java.lang.String are in module java.base of loader 'bootstrap') |
| negative | -2 | Error — class java.lang.Integer cannot be cast to class java.lang.String (java.lang.Integer and java.lang.String are in module java.base of loader 'bootstrap') |
| decimal | 2.5 | Error — class java.lang.Double cannot be cast to class java.lang.String (java.lang.Double and java.lang.String are in module java.base of loader 'bootstrap') |
| numeric string | "12" | false |
| text | "hello" | false |
| empty string | "" | true |
| boolean | true | Error — class java.lang.Boolean cannot be cast to class java.lang.String (java.lang.Boolean and java.lang.String are in module java.base of loader 'bootstrap') |
| false | false | Error — class java.lang.Boolean cannot be cast to class java.lang.String (java.lang.Boolean and java.lang.String are in module java.base of loader 'bootstrap') |
| typed date | {"$date":"2026-01-15T15:00:00Z"} | Error — class java.util.Date cannot be cast to class java.lang.String (java.util.Date and java.lang.String are in module java.base of loader 'bootstrap') |
| decimal128 | {"$numberDecimal":"1.25"} | Error — class org.bson.types.Decimal128 cannot be cast to class java.lang.String (org.bson.types.Decimal128 is in unnamed module of loader 'app'; java.lang.String is in module java.base of |
| empty array | [] | Error — class java.util.ArrayList cannot be cast to class java.lang.String (java.util.ArrayList and java.lang.String are in module java.base of loader 'bootstrap') |
| numeric array | [1,2,3] | Error — class java.util.ArrayList cannot be cast to class java.lang.String (java.util.ArrayList and java.lang.String are in module java.base of loader 'bootstrap') |
| mixed array | [1,null,"x",3] | Error — class java.util.ArrayList cannot be cast to class java.lang.String (java.util.ArrayList and java.lang.String are in module java.base of loader 'bootstrap') |
| nested array | [[1,2],[3]] | Error — class java.util.ArrayList cannot be cast to class java.lang.String (java.util.ArrayList and java.lang.String are in module java.base of loader 'bootstrap') |
| empty object | {} | Error — class org.bson.Document cannot be cast to class java.lang.String (org.bson.Document is in unnamed module of loader 'app'; java.lang.String is in module java.base of loader 'bootstr |
| object | {"x":1} | Error — class org.bson.Document cannot be cast to class java.lang.String (org.bson.Document is in unnamed module of loader 'app'; java.lang.String is in module java.base of loader 'bootstr |
| 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.