Script to limit entry on a Typeform to one per email address.

You want to avoid people filling twice the same Typeform? Using this serverless function we will update logic block on a typeform. It adds a new constraint every time someone fills the form for the best time. If they try again they will be redirected to an error screen.

Pre-requesites:

• a Typeform account, create one here
• an AWS account, create one here
• aws-cli installed and configured, instructions
• Serverless framework installed locally - npm install -g serverless

1. Create a form if you don't have one.
2. Add an email field if you don't have one already.
3. Add a statement containing an explicit error message. We will display it when a user already filled the form.
4. Add sample logic between the email block and statement.
5. Get your typeform URL, and keep your form ID. https://{ACCOUNT_NAME}.typeform.com/to/{FORM_ID}
6. Hit https://api.typeform.com/forms/{FORM_ID} directly in the browser.

7. Look at the JSON payload, under fields array and extract the id and ref of both the field you want to use as a unique identifier (email block) and the statement block.
8. Finally get yourself a Typeform personal token here

1. Clone repo locally git clone https://github.com/picsoung/tf-lambda-limit-one-entry.git
2. cd tf-lambda-limit-one-entry.git
3. run npm install
4. Open serverless.yml
5. Update environment variables with your own: FORM_ID: 'YOUR_FORM_ID' # Which form you want to update FIELD_ID: 'YOUR_EMAIL_FIELD_ID' # Id of the unique field FIELD_REF: 'YOUR_EMAIL_FIELD_REF' # Ref of the unique field TF_TOKEN: 'TYPEFORM_PERSONAL_TOKEN' #Typeform API token ALREADY_FILLED_FIELD_REF: 'STATEMENT_BLOCK_FIELD_REF' # Ref for the "already filled" statement block
6. Deploy function to production sls deploy
7. Test it live 🤩

Something is mispelled, the code could be optimized, you want to add features...? Feel free to fork this repo and summit a pull request.

First timers welcome 😃

This is a showcase of what's doable to enrich your typeform fields with data. Using this function as an example you build more complex interactions.

Let us know if you are building something.