> ## Documentation Index > Fetch the complete documentation index at: https://docs.feedbackflowhq.com/llms.txt > Use this file to discover all available pages before exploring further. # Data Prefilling > URL Data Prefilling for Link Surveys in Feedbackflow Data prefilling via the URL allows you to increase completion rate by prefilling data you already have in a different system. Feedbackflow 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 Feedbackflow * Want to embed a survey in an email and increase completion by prefilling the choice selected in the email ## Quick Example ```sh Example URL theme={null} https://app.feedbackflowhq.com/s/clin3dxja02k8l80hpwmx4bjy?question_id_1=answer_1&question_id_2=answer_2 ``` ## How it works To prefill survey questions, add query parameters to the survey URL using the format `questionId=answer`. The answer must match the question’s expected type to pass [validation](/xm-and-surveys/surveys/link-surveys/data-prefilling#validation). Please make sure the answer is [URL encoded](https://www.urlencoder.org/). ## Prefilling Customisation You can customise the prefilling behaviour using the `skipPrefilled` parameter in the URL. To skip prefilled questions and show the next available question, add `skipPrefilled=true` to the URL. By default, `skipPrefilled` is set to `false`. ## Prefilling multiple values Feedbackflow lets you prefill as many values as you want. Combine multiple values in the URL using `&`, for example: `name=Bernadette&age=18`. The order of query parameters doesn’t matter, so you can move questions around or add new ones without worrying about the parameter order. ## Where do I find my question Id? You can find the `questionId` in the **Advanced Settings** at the bottom of each question card in the Survey Editor. You can update the `questionId` to any string you like. However, once you publish your survey, the `questionId` cannot be changed. The question Id is located at the bottom of each question card in the survey editor. ## Examples Here are a few examples to get you started: ### Rating Question Translates to 5 stars / points / emojis: ```sh Rating Question theme={null} https://app.feedbackflowhq.com/s/clin3yxja52k8l80hpwmx4bjy?rating_question_id=5 ``` ### NPS Question Translates to an NPS rating of 10: ```sh NPS Questions theme={null} https://app.feedbackflowhq.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: ```sh Single-select Question theme={null} https://app.feedbackflowhq.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: ```sh Multi-select Question theme={null} https://app.feedbackflowhq.com/s/clin3yxja52k8l80hpwmx4bjy?multi_select_question_id=Sun%2CPalms%2CBeach ``` ### Open Text Question Adds 'I love Feedbackflow' as the answer to the open text question: ```sh Open Text Question theme={null} https://app.feedbackflowhq.com/s/clin3yxja52k8l80hpwmx4bjy?openText_question_id=I%20love%20Feedbackflow ``` ### CTA Question Adds 'clicked' as the answer to the CTA question. Alternatively, you can set it to 'dismissed' to skip the question: ```txt CTA Question theme={null} https://app.feedbackflowhq.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. ```txt Consent Question theme={null} https://app.feedbackflowhq.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 ```txt Picture Selection Question. theme={null} https://app.feedbackflowhq.com/s/clin3yxja52k8l80hpwmx4bjy?pictureSelection_question_id=1%2C2%2C3 ``` All other question types, you currently cannot prefill via the URL. ## 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. If an answer is invalid, the prefilling will be ignored and the question is presented as if not prefilled.