# setFieldValue

The `setFieldValue` method sets the value of a field in a document. If the field does not exist, it is created. If the field already exists, the existing value is overwritten.

## Syntax

    setFieldValue( fieldname, newvalue )

## Arguments

Argument | Description
--- | ---
`fieldname` | (string) The name of the field to set.
`newvalue` | (string) The value to set for the field.

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