Link Surveys

Data Prefilling in Link Surveys

Data prefilling via the URL allows you to increase completion rate by prefilling data you already have in a different system. Formbricks allows you to prefill multiple questions in a survey.

Purpose

Data prefilling via URL comes in handy when you:

• Have data for some of the respondents, but not all
• Have data you want the respondent to confirm or update
• Have data in a different system (e.g. your database) and want to add it to the user profile in Formbricks
• Want to embed a survey in an email and increase completion by prefilling the choice selected in the email

Quick Example

https://app.formbricks.com/s/clin3dxja02k8l80hpwmx4bjy?question_id_1=answer_1&question_id_2=answer_2

How it works

To prefill the questions of a survey, add query parameters to the survey URL. The query parameter should be in the format questionId=answer. The answer has to match the expected type of the question to pass through the validation. For example, if the first question is a rating question, the answer has to be a number. If the first question is a single select question, the answer has to be a string identical to one of the answer options.

Prefilling Customisation

You can customize the prefilling behavior using the skipPrefilled parameter in the URL. If you want to skip the prefilled questions and show the next available question, you can add skipPrefilled=true to the URL. By default, the skipPrefilled parameter is set to false.

Prefilling multiple values

Formbricks let's you prefill as many values as you want. You can combine multiple values in the URL using & so for example name=Bernadette&age=18. The order of the query parameters does not matter so you can always move around questions or add new ones without having to worry about the order of the query parameters.

Where do I find my question Id?

You find the questionId in the Advanced Settings toggle at the bottom of each question card in the Survey Editor. As you see, you can update the questionId to any string you like. However, once you published your survey, this questionId cannot be updated anymore:

Examples

Here are a few examples to get you started:

Rating Question

Translates to 5 stars / points / emojis:

https://app.formbricks.com/s/clin3yxja52k8l80hpwmx4bjy?rating_question_id=5

NPS Question

Translates to an NPS rating of 10:

https://app.formbricks.com/s/clin3yxja52k8l80hpwmx4bjy?nps_question_id=10

Single Select Question (Radio)

Chooses the option 'Very disappointed' in the single select question. The string has to be identical to the option in your question:

https://app.formbricks.com/s/clin3yxja52k8l80hpwmx4bjy?single_select_question_id=Very%20disappointed

Multi Select Question (Checkbox)

Selects three options 'Sun, Palms and Beach' in the multi select question. The strings have to be identical to the options in your question:

https://app.formbricks.com/s/clin3yxja52k8l80hpwmx4bjy?multi_select_question_id=Sun%2CPalms%2CBeach

Open Text Question

Adds 'I love Formbricks' as the answer to the open text question:

https://app.formbricks.com/s/clin3yxja52k8l80hpwmx4bjy?openText_question_id=I%20love%20Formbricks

CTA Question

Adds 'clicked' as the answer to the CTA question. Alternatively, you can set it to 'dismissed' to skip the question:

https://app.formbricks.com/s/clin3yxja52k8l80hpwmx4bjy?cta_question_id=clicked

Consent Question

Adds 'accepted' as the answer to the Consent question. Alternatively, you can set it to 'dismissed' to skip the question.

https://app.formbricks.com/s/clin3yxja52k8l80hpwmx4bjy?consent_question_id=accepted

Picture Selection Question

Adds index of the selected image(s) as the answer to the Picture Selection question. The index starts from 1

https://app.formbricks.com/s/clin3yxja52k8l80hpwmx4bjy?pictureSelection_question_id=1%2C2%2C3

Validation

Make sure that the answer in the URL matches the expected type for the questions.

The URL validation works as follows:

• For Rating or NPS questions, the response is parsed as a number and verified if it's accepted by the schema.
• For CTA type questions, the valid values are "clicked" (main CTA) and "dismissed" (skip CTA).
• For Consent type questions, the valid values are "accepted" (consent given) and "dismissed" (consent not given).
• For Picture Selection type questions, the response is parsed as an array of numbers and verified if it's accepted by the schema.
• All other question types are strings.