SurveyJS v2.5.15

Released: March 11, 2026

SurveyJS v2.5.15 introduces new API settings for customizing expression syntax and adds support in Survey Creator for preserving incorrect property values so users can correct them later. Bug fixes and minor enhancements are included as well.

This release introduces two global settings that allow you to customize parts of the expression syntax.

expressionVariableDelimiters specifies delimiters used to reference variables in expressions and dynamic texts. It accepts an object with start and end string properties.

By default, SurveyJS uses curly braces ({ and }). You can replace them with other symbols or symbol sequences:

import { settings } from "survey-core";

// {{variableName}}
settings.expressionVariableDelimiters = { start: "{{", end: "}}" };

// {% variableName %}
settings.expressionVariableDelimiters = { start: "{% ", end: " %}" };

// %variableName%
settings.expressionVariableDelimiters = { start: "%", end: "%" };

The recently introduced capability to access element property values within expressions and dynamic texts uses the dollar sign ($) as the default prefix. The expressionElementPropertyPrefix setting allows you to change this prefix or disable the feature entirely:

import { settings } from "survey-core";

// Use @ to access element property values
settings.expressionElementPropertyPrefix = "@";

// Disable accessing element property values within expressions
settings.expressionElementPropertyPrefix = "";

Previously, property editors cleared property values if they were invalid. This behavior could disrupt the workflow when users intended to fix the value later.

Starting with Survey Creator v2.5.15, invalid values are preserved instead of being removed. Users can continue working in the Property Grid and return to correct the value later. Invalid values are stored in temporary storage and are not included in the survey JSON schema until they are corrected.

How to Create a Custom Thank You Page

Form Library

• Source code contains circular dependencies (#10975)
• Numeric Input: Step error text cannot be customized in the survey JSON schema (#10959)
• Radio Button Group / Checkboxes: "Other" input field doesn't support immediate required validation (#10964)

Survey Creator

• Logic tab: useElementTitles setting is ignored for choice options in conditions (#7490)
• Toolbox search doesn't work in Shadow DOM (#7406)

npm i survey-core@v2.5.15 survey-angular-ui@v2.5.15 --save
npm i survey-creator-core@v2.5.15 survey-creator-angular@v2.5.15 --save
npm i survey-analytics@v2.5.15 --save
npm i survey-pdf@v2.5.15 --save

npm i survey-core@v2.5.15 survey-react-ui@v2.5.15 --save
npm i survey-creator-core@v2.5.15 survey-creator-react@v2.5.15 --save
npm i survey-analytics@v2.5.15 --save
npm i survey-pdf@v2.5.15 --save

npm i survey-core@v2.5.15 survey-vue3-ui@v2.5.15 --save
npm i survey-creator-core@v2.5.15 survey-creator-vue@2.5.15 --save
npm i survey-analytics@2.5.15 --save
npm i survey-pdf@2.5.15 --save

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