123FormBuilder API – POST Webhook

Important Note

This version of the API was deprecated. If you still need to automate your data collection processes, and retrieve collected data or make various operations related to your 123FormBuilder account through API calls, you can use our new and improved API v2. Please visit our developer documentation for more details.

Here you can learn how to use the POST Webhook API of our HTML form generator.

The POST Webhook API page is useful in integrating a form with an external application. More precisely, the form submission is the “trigger” and the webhook URL is the resulting “action”.

The logic behind performs a POST action, so it only outputs whether the operation was successful or not.

The webhook URL is specified by the webhookUrl POST parameter, which has to be previously set using urlencode() in PHP or an equivalent function in another language.

Page URL Example:

https://app.123formbuilder.com/api/forms/[FORM ID]/webhooks.xml?apiKey=[API KEY]&webhookUrl=[YOUR URL]

The above does the exact same thing that the 123FormBuilder – WebHook application does from the Applications section of your form. Also, you cannot link more than ten applications to your form via Webhook.

If you find this method to add Webhooks to your forms much useful, go ahead and create your URL. If not, then try the 123FormBuilder – WebHook integration as described in our step-by-step documentation.

For more details about API – POST Webhook, check out this article from our Developer Center.


  1. Hi!

    Using 123forms, is there a way to check the input of a field against data on another server, and then pre-populate with retrieved data?

    for example if I wanted to pre-populate fields based on a member id – and retrieve them from my server to be seen in readonly fields on 123form?

    1. Hi there!

      Thanks for your query!

      For your requirement of pre-populating fields from another server, we’d like to take a closer look. Please send your specific use case to customercare@123formbuilder.com. We’ll work with you to find the best solution!

  2. I am building a custom HTML form in PHP on wordpress. Is there a way to push the fields in my form to the database in 123 to the matching form?

    1. Hello Casey! I am afraid this is not possible. You will need to create the form on 123 and publish your form using the iframe code from Publish – Embed code- Iframe and paste it into your WP page.

  3. I am using 123FormBuilder in Wix, so guide me that how to get user input data from the form one by one.
    (I need to pass that data to external API)

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