# Alphanumeric String Key (AlphaNumericPkGenerator)

The [Alphanumeric String Key](/app/generation/generators/generator-reference/alphanumeric-string-key.md) generator can be applied to primary key columns. It generates unique alphanumeric strings of the same length as the input.

For example, for the origin value ABC123, the output value is a six-character alphanumeric string such as D24N05.

## Link object structure <a href="#generator-api-alphanumeric-string-key-link-object" id="generator-api-alphanumeric-string-key-link-object"></a>

The Alphanumeric String Key generator can be self-consistent, but not consistent with another column. You cannot configure differential privacy.

The `metadata` object is populated from the [`BaseMetadata`](https://app.tonic.ai/apidocs/index.html#/models/BaseMetadata) object.

There is no generator-specific configuration.

```json
{
  "schema": "string",
  "table": "string",
  "column": "string",
  "path": "string",  //JSON fields only
  "dataType": "string",  //MongoDB, Amazon DynamoDB, and JSON fields only
  "metadata": {
    "presetId": "string",
    "generatorId": "AlphaNumericPkGenerator",
    "isConsistent": boolean,
    "encryptionProcessor": "x-on", //To use configured Structural data encryption
    "customValueProcessor": "string" //If custom value processor applied
  }
}
```

## Example replacement <a href="#generator-api-alphanumeric-string-key-replacement" id="generator-api-alphanumeric-string-key-replacement"></a>

The following example replacement configures a column to use the built-in generator preset for the Alphanumeric String Key generator. The generator is not consistent.

```json
{
  "name": "workclass",
  "schema": "public",
  "table": "employees",
  "links": [
    {
      "schema": "public",
      "table": "employees",
      "column": "workclass",
      "metadata": {
        "presetId": "AlphaNumericPkGenerator",
        "generatorId": "AlphaNumericPkGenerator",
        "isConsistent": false
      }
    }
  ]
}
```


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