Converts an input base64 value to text. Output type is String.
- base64 is a method of representing data in a binary format over text protocols. During encoding, text values are converted to binary values 0-63. Each value is stored as an ASCII character based on a conversion chart.
Typically, base64 is used to transmit binary information, such as images, over transfer methods that use text, such as HTTP.
NOTE: base64 is not an effective method of encryption.
- For more information on base64, see https://en.wikipedia.org/wiki/Base64.
Wrangle vs. SQL: This function is part of Wrangle, a proprietary data transformation language. Wrangle is not SQL. For more information, see Wrangle Language.
Basic Usage
Column reference example:
base64decode(mySource)
Output: Decodes the base64 values from the mySource column into text.
String literal example:
base64decode('GVsbG8sIFdvcmxkLiA=')
Output: Decodes the input value to the following text: Hello, World. .
Syntax and Arguments
base64decode(column_string)
| Argument | Required? | Data Type | Description |
|---|---|---|---|
| column_string | Y | string | Name of the column or string literal to be applied to the function |
For more information on syntax standards, see Language Documentation Syntax Notes.
column_string
Name of the column or string constant to be converted.
- Missing string or column values generate missing string results.
- String constants must be quoted (
'Hello, World'). - Multiple columns and wildcards are not supported.
Usage Notes:
| Required? | Data Type | Example Value |
|---|---|---|
| Yes | String literal or column reference | myColumn |
Tip: For additional examples, see Common Tasks.
Examples
Example - base64 encoding and decoding
BASE64ENCODE- converts an input string to base64 encoding, with optional padding at the end. See BASE64ENCODE Function.BASE64DECODE- converts an input base64encoded-string back to ASCII text. See BASE64DECODE Function.
Source:
The following example contains three columns of different data types:
| IntegerField | StringField | ssn |
|---|---|---|
| -2082863942 | This is a test string. | 987654321 |
| 2012994989 | "Hello, world." | 987654322 |
| -1637187918 | "Hello, world. Hello, world. Hello, world." | 987654323 |
| -1144194035 | fyi | 987654324 |
| -971872543 | 987654325 | |
| 353977583 | This is a test string. | 987-65-4321 |
| -366583667 | "Hello, world." | 987-65-4322 |
| -573117553 | "Hello, world. Hello, world. Hello, world." | 987-65-4323 |
| 2051041970 | fyi | 987-65-4324 |
| 522691086 | 987-65-4325 |
Transformation - encode:
You can use the following transformation to encode all of the columns in your dataset:
| Transformation Name | Edit column with formula |
|---|---|
| Parameter: Columns | * |
| Parameter: Formula | base64encode($col, true) |
Results - encode:
The transformed dataset now looks like the following. Note the padding (equals signs) at the end of some of the values. Padding is added by default.
| IntegerField | StringField | ssn |
|---|---|---|
| LTIwODI4NjM5NDI= | VGhpcyBpcyBhIHRlc3Qgc3RyaW5nLg== | OTg3NjU0MzIx |
| MjAxMjk5NDk4OQ== | IkhlbGxvLCB3b3JsZC4i | OTg3NjU0MzIy |
| LTE2MzcxODc5MTg= | IkhlbGxvLCB3b3JsZC4gSGVsbG8sIHdvcmxkLiBIZWxsbywgd29ybGQuIg== | OTg3NjU0MzIz |
| LTExNDQxOTQwMzU= | Znlp | OTg3NjU0MzI0 |
| LTk3MTg3MjU0Mw== | OTg3NjU0MzI1 | |
| MzUzOTc3NTgz | VGhpcyBpcyBhIHRlc3Qgc3RyaW5nLg== | OTg3LTY1LTQzMjE= |
| LTM2NjU4MzY2Nw== | IkhlbGxvLCB3b3JsZC4i | OTg3LTY1LTQzMjI= |
| LTU3MzExNzU1Mw== | IkhlbGxvLCB3b3JsZC4gSGVsbG8sIHdvcmxkLiBIZWxsbywgd29ybGQuIg== | OTg3LTY1LTQzMjM= |
| MjA1MTA0MTk3MA== | Znlp | OTg3LTY1LTQzMjQ= |
| NTIyNjkxMDg2 | OTg3LTY1LTQzMjU= |
Transformation - decode:
The following transformation can be used to decode all of the columns:
| Transformation Name | Edit column with formula |
|---|---|
| Parameter: Columns | * |
| Parameter: Formula | base64decode($col) |
Results - decode:
| IntegerField | StringField | ssn |
|---|---|---|
| -2082863942 | This is a test string. | 987654321 |
| 2012994989 | "Hello, world." | 987654322 |
| -1637187918 | "Hello, world. Hello, world. Hello, world." | 987654323 |
| -1144194035 | fyi | 987654324 |
| -971872543 | 987654325 | |
| 353977583 | This is a test string. | 987-65-4321 |
| -366583667 | "Hello, world." | 987-65-4322 |
| -573117553 | "Hello, world. Hello, world. Hello, world." | 987-65-4323 |
| 2051041970 | fyi | 987-65-4324 |
| 522691086 | 987-65-4325 |
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