Azure DevOps, optional parameter with empty string as default?

Question

Is there a way to have an optional runtime parameter that defaults to an empty string and have it actually display an empty string?

Issue 1: When using an empty string, the parameter becomes required and the user must input something, otherwise the Run button remains disabled.

Issue 2: A workaround is to change the type from string to object, but then it awkwardly displays a single ".

Example:

name: required
displayName: Required
type: string
default:

name: obj
displayName: Object type
type: object
default: ""

name: objtwo
displayName: Object type
type: object
default:

This question is similar to: How to allow an empty string for a runtime parameter?. If you believe it’s different, please edit the question, make it clear how it’s different and/or how the answers on that question are not helpful for your problem. — bryanbcook
– bryanbcook, Commented Dec 3 at 15:28

bryanbcook · Accepted Answer · 2025-12-03 15:28:11Z

0

There is a similar question here, which suggests you can use a string parameter with a value of an empty space ' ' for a string. The UI treats the space as a valid input.

answered Dec 3 at 15:28

bryanbcook

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2 Comments

Zeek Aran Dec 4 at 17:15

As this comment says stackoverflow.com/a/65949329/3123147, it leaves the space there. So rather than being empty, it contains a single character of whitespace ` `.

bryanbcook Dec 4 at 21:18

Yes. If you're putting in a space, you'd have to check for space in your pipeline.trim( parameter.required ) would remove the spaces

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