# Building Expressions

Expressions are JSON like objects which process and return a specific **calculated** output at the runtime. An expressions object looks like -

## Syntax

```json
{
    <operator>: <value>
}
```

### Properties

| Field       | Description                                                                                                                                                                                                      | Required |
| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------- |
| \<operator> | A CQL expression operator which defines what type of computation has to be done in this expression. You can check the list of CQL expression operators [**here**](#list-of-expression-objects-available-in-cql). | true     |
| \<value>    | A list or dict of arguments required for the corresponding CQL operator.                                                                                                                                         | true     |

## Restrictions

You can have **at most 1 CQL operator** per expression object.

## Examples

```json
{
    "$add": [1,2,3]
}
```

The above expression will return **6** when used in any node that supports Expressions.

## List of Expression Operators available in CQL

* [$abs](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdabs.md)
* [$add](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdadd.md)
* [$addDate](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdadddate.md)
* [$arrayElemAt](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdarrayelemat.md)
* [$avg](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdavg.md)
* [$buildDateTime](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdbuilddatetime.md)
* [$ceil](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdceil.md)
* [$cond](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdcond.md)
* [$divide](/flow-builder/cql-cosmocloud-query-language/building-expressions/usddivide.md)
* [$floor](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdfloor.md)
* [$ifNull](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdifnull.md)
* [$max](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdmax.md)
* [$min](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdmin.md)
* [$mod](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdmod.md)
* [$multiply](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdmultiply.md)
* [$pow](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdpow.md)
* [$subtract](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdsubtract.md)
* [$sqrt](/flow-builder/cql-cosmocloud-query-language/building-expressions/usdsqrt.md)


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