# Double Braces functions
You can use Double Braces functions to manipulate data in a pipeline.
## Syntax
Double Braces functions are enclosed within two sets of curly braces and a blank space, with the function name followed by a list of parameters enclosed in parentheses, like this:
```
{{ FUNCTIONNAME(param1, param2) }}
```
Double Braces functions are case-insensitive, but we recommend writing them in upper case as a best practice.
### Nesting functions
You can use Double Braces function calls inside other functions, like this:
```
{{ OUTSIDEFUNCTION(INSIDEFUNCTION(param1,param2), param3) }}
```
When you do this, the functions are executed from the inside to the outside. That is, in the example above, `INSIDEFUNCTION` is executed first and its output is used as a parameter for `OUTSIDEFUNCTION`, which is executed last.
Unlike programming languages, Double Braces expressions executes all functions at the same moment, regardless of whether the IF condition is `true` or `false`. This differs from programming languages, which usually execute functions only after checking the IF condition.
#### Example
**Input**
```
{
"date": "2022-10-26T03:00:00Z"
}
```
**Double Braces expression**
```
{
"format": {{ IF(EQUALTO(SIZE(message.date),20),FORMATDATE( message.date, "yyyy-MM-dd'T'HH:mm:ss'Z'", "dd/MM/yyyy"),FORMATDATE( message.date, "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "dd/MM/yyyy")) }}
}
```
**Output**
```
{
"success": false,
"message": "Encountered a configuration error while generating JSON",
"error": "com.digibee.pipelineengine.exception.PipelineEngineConfigurationException: com.digibee.doublebraces.service.DoubleBracesConfigurationException: Syntax error parsing double braces expression {{ IF(EQUALTO(SIZE(message.date),20),FORMATDATE( message.date, \"yyyy-MM-dd'T'HH:mm:ss'Z'\", \"dd/MM/yyyy\"),FORMATDATE( message.date, \"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'\", \"dd/MM/yyyy\")) }}: Could not parse date/time evaluating function FORMATDATE. Error: Text '2022-10-26T03:00:00Z' could not be parsed at index 19"
}
```
## Function list
Below, we have listed Double Braces functions by groups based on their usage.
### COMPARISON
Used to compare booleans inputs. To learn more, read the article [Comparison Functions](/documentation/connectors-and-triggers/double-braces/double-braces-functions/comparison-functions.md):
* AND
* NOT
* OR
* XOR
### NUMERICAL
Used to manipulate numeric values. To learn more, read the article [Numerical Functions](/documentation/connectors-and-triggers/double-braces/double-braces-functions/numerical-functions.md):
* FORMATNUMBER
* TODOUBLE
* TOINT
* TOLONG
* TONUMBER
* RANDOMNUMBERS
### CONDITIONAL
The functions in this group return a value according to a specified criteria. To learn more, read the article [Conditional Functions](/documentation/connectors-and-triggers/double-braces/double-braces-functions/conditional-functions.md):
* EQUALTO
* GREATERTHAN
* GREATERTHANEQUAL
* IF
* LESSTHAN
* LESSTHANEQUAL
* ISOBJECT
* ISARRAY
* ISBOOLEAN
* ISSTRING
* ISNUMBER
* ISNULL
* SWITCHCASE
* ISABSENT
### DATE
Used to manipulate dates. To learn more, read the article [Date Functions](/documentation/connectors-and-triggers/double-braces/double-braces-functions/date-functions.md):
* FORMATDATE
* NOW
* SUMDATE
* TOISODATE
* DIFFDATE
### FILE
Used to query metadata and validate files. To learn more, read the article [Comparison Functions](/documentation/connectors-and-triggers/double-braces/double-braces-functions/comparison-functions.md):
* FILEEXISTS
* FILESIZE
### JSON
Used to manipulate JSON objects. To learn more, read the article [JSON Functions](/documentation/connectors-and-triggers/double-braces/double-braces-functions/json-functions.md):
* JSONPATH
* TOJSON
* UNESCAPEJSON
* GETELEMENTAT
* LASTELEMENT
* REMOVEAT
* NEWEMPTYOBJECT
* NEWEMPTYARRAY
* PUSH
* POP
* CARDINALITYONE
* CARDINALITYMANY
### MATH
Used to make mathematical operations. To learn more, read the article [Math Functions](/documentation/connectors-and-triggers/double-braces/double-braces-functions/math-functions.md):
* ABS
* CEIL
* DIVIDE
* LOG
* MAX
* MIN
* MOD
* MULTIPLY
* POW
* ROUND
* SQRT
* SUBTRACT
* SUM
### STRING
Used to manipulate strings. To learn more, read the article [String Functions](/documentation/connectors-and-triggers/double-braces/double-braces-functions/string-functions.md):
* CAPITALIZE
* CONCAT
* CONCATWITHOUTTAB
* ESCAPE
* FUZZYMATCH
* INDEXOF
* JOIN
* LASTINDEXOF
* LEFTPAD
* LOWERCASE
* MATCHES
* NORMALIZE
* REPLACE
* RIGHTPAD
* SPLIT
* SUBSTRING
* TOSTRING
* UPPERCASE
* CONTAINS
* DEFAULT
* UNESCAPE
* TRIM
* STRINGMATCHES
* RANDOMSTRINGS
### UTILITIES
Used to make operations that do not fit the other categories. To learn more, read the article [Utilities Functions](/documentation/connectors-and-triggers/double-braces/double-braces-functions/utilities-functions.md):
* BASEDECODE
* BASEENCODE
* UUID
* TOBOOLEAN
* SIZE
* BASEURLDECODE
* BASEURLENCODE
* URIDECODE
* URIENCOD
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