How to leave the first letter in a word

The node gets names of different lengths. For example, Vanessa, Mike, Bob. How do I trim a word so that the first letter remains?

Vanessa > V
Mike > M
Bob > B

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In javascript you can simply use a [indexNumber] after a field to access the characters by a number as if it’s an array.

So just use this {{ $json.fieldName[0] }} and of course change “fieldName” to your field

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