Supported fields using Input Designer

To build a Zapier integration, you need to do two things: tell Zapier how to connect to your API, and create forms where users can input data to send to your API.

Input Designer is built for the latter. Where every other step in building a Zapier integration asks you add to enter details in a form, here you create a new form designed for the data your app needs.

Both Triggers and Actions can have an input form—but input forms are required in actions, as they always need a way for users to send data to your app to find, update, or create something new. Input Designer works the same in both.

How to Use Zapier Input Designer

Input Designer works similarly to other form builder tools such as Wufoo or Google Forms, only here you’re building a form that lives inside your Zapier integration. Add fields to your form for each bit of data your app needs from users. Zapier uses string short text fields by default or you can choose from nine other field types to gather the data your app needs. Configure the field settings, then reorder them to match the logical order users would add data in your app.

Add Fields

Zapier Input Designer

Zapier integrations can use three types of fields:

  • Input Fields are the main type of field that most integrations use, with 10 field types to let users enter plain text data and map variables from previous triggers and actions into the field.
  • Dynamic Fields make API calls to your app, then show the returned data in a dropdown menu so users can select the item needed, often used for folders, projects, assignees, and other data that would need to be chosen from your app.
  • Line Item Group organize a set of Input Fields to create line items, where each item in a comma separated list entered in the field would create a new separate item in your app, often used for line items in invoice and accounting apps.

Most Zapier integrations rely on input fields. Integrations only need dynamic fields if users would need to select data from your app in the form, and would only need line items if users commonly add multiple lines of similar details to your app.

Example Input Editor

To add a field, click the Add button and select the field type. Enter the field details, including:

  • Label: A user friendly name for the field, such as First Name.
  • Key: A unique identifier for the field, without spaces, ideally with the same key as your API, such as first_name.
  • Help Text: (optional) A 20 character or longer description that appears under the field label, with Markdown formatting.
  • Type: One of ten field types, with String as the default field type; see details on each field type below.
  • Default Text: (optional) Copy to include in the field if the user doesn’t enter anything; only include if this copy would work in every user’s account.
  • Options: (optional) Check whether this field should be required, if multiple values can be added, if the field is used to alter dynamic fields, or if it should be a dropdown.

Set each option and preview how your field looks inside a Zap on the right. When finished, click Save then repeat the process to add each field your trigger or action step needs.

Set Field Options


Zapier Required Field

Have any fields your API requires to included data in order to find or create something in your app? For example, if an email app like MailChimp requires an email address to add a new email subscription, and a calendar app like Google Calendar requires an event title, date, and time to add new events.

If your trigger or action step requires any data, check the Required box on those fields. Zapier will show a red (required) label beside the field name, and will not let users complete the Zap step without adding data to that field.

Be sure to include a description on required fields to let users know exactly what type of data they should add to this field so the integration will work as expected. Also, never mark fields as required if the integration could work without them.

Allows Multiples

Zapier Field Allows Multiples

Have a field where users could add multiple entries in the same field? For example, Gmail’s integration lets users add multiple tags to email messages. For fields like this, check the Allows Multiples box.

That will add another entry row to allow the user to input another entry for that field. Zapier’s platform then delivers each entry in a comma separated list to your API.

Alters Dynamic Fields

If you have dynamic fields in your integration, where Zapier runs code to decide whether to show a field or what to show in a field, you can use other input fields to modify those dynamic fields.

Say you have a field that is only shown depending on the value of a previous field. The latter field should have the Alters Dynamic Fields option checked, then the previous field should be a dynamic field with code to watch for the value of that field. Or, say your app lets users manage personal and work tasks, and add tasks to the correct project. You could first let them choose whether they’re adding personal or work tasks, and mark that field as Alters Dynamic Fields. Then you would add a Dynamic Field to your Input Form that uses this field and fetches the appropriate projects from your app.

If you check the Alters Dynamic Fields option on a field, Zapier will automatically recompute any dynamic fields in your Zapier integration anytime this field is changed. Do not check the Alters Dynamic Fields box unless the field is needed for your integrations’ dynamic fields.

Static Dropdown

Zapier form field dropdown

Need to offer users pre-set options to choose from in a field? Make sure your field type is set as String, then check the Dropdown box.

That opens two options: the default Static as pictured above, or Dynamic. To add a Static menu of choices, type the options in a comma separated list, with quotes around each item and square brackets around the set, such as:

["one", "two","three"]

Enter the fields as used in your API, as Zapier will pass the exact value users select to your app. In the Zap editor, though, Zapier will capitalize each item in your dropdown menu, and will add spaces instead of any underscores, so an option like first_name would show in the menu as First Name.

Static Dropdown with Key Value Pairs

Zapier dropdown with key value pairs

If your API requires different values for the field than the text you want to show to users inside the dropdown menu in Zapier, you can make a key value pair that includes the value to send to your API, the sample value to show users (should be the same as the value), and a user-friendly label.

To do that, add each menu item inside curly brackets, with the sample, value, and label comma seperated, with the item listed first and the value listed second, both wrapped in quotes. Seperate each menu item with commas, and wrap the whole set in square brackets.

For example, if our API expected a value of 1 or 2, but 1 actually means pork and 2 actually means fish, you could use the following code to add a dropdown menu that would look like the one above:

    "sample": "1",
    "value": "1",
    "label": "Pork"
    "sample": "2",
    "value": "2",
    "label": "Fish"

Dynamic Dropdown

If users need to select data from their account in your app—such as a project, folder, team member, or other user-specific detail—then you can use a dynamic dropdown. For dynamic dropdowns, Zapier first fetches data from your API and then displays it in a menu.

Zapier uses triggers to fetch the values for dynamic dropdown menus. The best way to make a dropdown is to make a dedicated trigger specifically for the dropdown data.

Build a Trigger to Fetch Dynamic Dropdown Data

Zapier hidden trigger setting

First, create a trigger as normal, with a key, name, and noun. Feel free to leave the description empty, as this trigger won’t be seen by users. In the Visibility Options field, select Hidden to hide this trigger from your app’s trigger list in Zapier.

Skip the Input Designer tab, as the dynamic dropdown cannot require any user input.

Zapier hidden trigger API setting

Then select the API Configuration tab, and add the API call where Zapier can fetch the data from your API. For standard Zapier triggers, you would use an API call that fetches new or newly updated items. For dynamic dropdowns, instead use an API call that pulls in a list of the items that the user can select from.

Zapier hidden trigger API options

Many API calls will need additional configuration to pull in data in the order that makes most sense in your menu. You may want to sort options in the order they were added or updated, or want to have the API fetch more items at once than the default. Set these parameters from the Show Options menu.

Additionally, most dynamic menus should let users load additional data if your API supports pagination. The first API call might pull in 20 items; if the user requests additional items, Zapier would call the API again and request the second page for the next 20 items.

To allow loading additional data with pagination, check the Support Paging box. In your API call, include your API’s pagination key and the {{}} value to pull in a page value. Zapier will call page 0 first, then page 1 when users request additional entries, using zero-based numbering. You can customize the pagination using Code Mode. Check the Pagination Triggers guide for more details.

Ordering Your Dropdown Menu Items: Zapier will show the data in the dropdown menu in the order your API sends it to Zapier. If your API sends the data in alphabetical order, or numerical order, it will show as such in your drop-down menu. If your API call supports sorting, be sure to include the sorting parameter in your API call that would return data in the order you want it to show in your drop-down.

Set output fields from dynamic dropdown

Finally, define the fields from your trigger that you need to use in the action input field. Test your trigger and identify the output fields needed, and add them to the Output Fields list at the end of your settings page. Include at least a field with the data that Zapier needs to send to your API in the action, along with a field that includes a human-friendly name for the data in that field.

Add an Input Field with Dynamic Fields

Select Trigger for Dynamic Fields

To use that data, add a new input field to your integration, and set the label, key, and other details as normal. Then, check the Dropdown box and select the Dynamic toggle. Choose the trigger with the data needed for this menu in the Dropdown Source option.

Select the field with the data your API needs for this action in the Field Name menu, and the field with a human-friendly name for the data in the Field Label menu. The preview will indicate the presence of the field, but you will need to use your action in a Zap to test the menu and pull in real data.

Whenever someone uses this input field in a Zap and opens the dropdown, Zapier will poll your API for the data from that trigger, parse the entries and extract the fields you specified, then show them in a user-friendly dropdown menu. The human-friendly name will be in larger, darker text, and the value to be sent to the API in smaller, lighter text.

Even though the API value isn’t as friendly for users as the name or label, it’s still important to provide it so that users know what type of data the field expects. Users can always choose to enter a custom value as an alternative to using the dropdown in order to map data from other Zap steps into this field. Being able to see what type of value to map is extremely helpful to them.

If you’re creating dynamic dropdowns via code, there are a few valid return types from your trigger based on whether the order matters and whether you need labels. These are outlined in more detail in the schema, but the short version is:

Need a Label? Does Order Matter? Type to Use
Yes No Object of value -> label
No Yes Array of Strings
Yes Yes Array of FieldChoiceWithLabel

Add Search to a Dynamic Field (Optional)

Zapier Dynamic Dropdown Search

Dynamic Dropdown menus can also include an additional Add a Search Step button beside the dropdown menu. This lets users dynamically select the correct item from a dynamic field based on input from previous Zap steps.

You first need a Search Trigger that can find the items used by this drop-down menu. Then check the Search box under your dropdown menu, choose that trigger, and enter the ID of the field from that trigger that Zapier needs to pass with this API call (which should include the same data as the Field Name you selected before for the dynamic menu).

When users click the Search button, Zapier will add a new Search step to their Zap before this action step. They can enter the details to search for the item they need, then Zapier will automatically map the correct output value from that search to this dynamic field.

Reorder Fields

Reorder Input Fields Zapier Change the order of input fields with the arrows, and preview the completed form on the right

Add a field that should be at the top or bottom of your form? You can reorder input fields from the Form Editor screen. Click the up or down arrows to move the fields to the order you want. The preview on the right shows how the finished form looks to users inside Zapier.

It’s worth thinking through your form field order to make your integration as easy to use as possible. Put the most important, required fields first, with less important, optional fields near the bottom. Put related fields (such as first and last name) near each other. If your app includes a similar input form to create new items, you could order fields in Zapier similar to those in your app to increase ease of use.

Remove Fields

Delete Input Fields Delete any fields that aren’t needed in your integration

Add too many fields, and decide you don’t need one? Or want to start over with a new field?

Open the Input Designer, click the gear icon beside the field you want to delete, then select Delete. Zapier will ask you to confirm; click again to fully remove that field from your integration.

Note that you cannot restore a previous version of your input form, so be sure to only delete unnecessary fields, and never remove input fields from live integrations. Instead, make a new version of your integration before changing input fields.

Zapier Input Field Types

Zapier includes ten different input field types to gather the specific data your app need for any Zap step. Each field shows the user which type of data to include—though do note that Zapier does not validate the data to ensure users added the correct item for that fieldtype. New input fields use the most versatile String option by default, but here are the details on each field type you can use to build integrations that work best with your app:


Zapier String Field

The default Zapier input field, a String field shows a blank line for text. Typically used to gather individual text values such as a name, email address, or other details.


Zapier Text Field

Text fields are for longer text. Users can easily write a few lines of text, often used to enter email messages, notes, and other longer info.


Zapier Integer Field

Integer fields are designed to gather integer number values, with a 1 2 3 tag beside the field in Zaps. They’re often used in Zapier along with a Dropdown field to select ID numbers for users, projects, and other internal data from apps, but can also be used to gather numbers.


Zapier Number Field

Number fields can gather numbers with any value, including decimal points, and show a 1.0 tag beside the field in Zaps. They’re most commonly used to gather numbers for integrations.


Zapier Boolean Field

Boolean fields let users select between yes and no values to set default settings in integrations, and return a corresponding 1 or 0 to your app. These are the simplest dropdown menus in Zaps.


Zapier DateTime Field

DateTime fields let users enter dates and times, using their human readable values, machine readable datetimes, or standard English words for time like tomorrow. Zapier interperpates the date input from users and outputs a standard ISO 8601 datetime to your API.

Learn more about how users can modify dates and times in Zapier.


Zapier Password Field

Password fields work the same as standard string fields, except they hide the text entered in the field. They’re most commonly used in Authentication fields, especially for Basic Auth, but can be used in an integration if your app asks users to enter sensitive data.


Zapier Dictionary Field

Dictionary fields let users enter their own value sets, with a plain text name followed by a String field to enter or map data from previous Zap steps. Users can click the + button on the right to add additional dictionary field entries as well.


Zapier Copy field

The Copy field is the only field that does not let users enter data, and it is not passed along to your API. Instead, this field shows the Help Text field’s Markdown formatted text as a rich text note inside the Zap step. It’s a handy way to share additional details about what to enter in the integration or link to external documentation if users would need more help.

Learn how to format text in Markdown.

How to Add a Line Item Group

Line Items are a useful way to add as much data to an app as users need, especially in invoices, orders, and other accounting work. Some items may only need one line item, say for orders where a customer purchases one thing. Others need three, or 15, and Zapier’s line items make it easy to automate either way.

Normal input fields in Zapier add one item each time the Zap runs. Fields inside a Line Item Group, however, are added once per comma separated value added to the field. Users would map, say, an order field containing item1,item2,item3 and a price field with 1.99,12.95,9.99, and Zapier would add three line item rows with each item and its correct price.

Learn more about line items from Zapier’s Line Item Guide and our Line Item Help Docs.

Add Zapier Line Item Group

If your app’s action step needs line items, select Line Item Group when adding a new field in the Input Designer. Add a name for the group of fields, something users would recognize as being a set of values where each one would be added individually. Also add a key for the group so Zapier can identify it internally.

Zapier Line Item Input Fields

Then add input fields for each item to include in your line item group. Click Add Line Item, then add the input field details as with other input fields. The only differences are that these fields will show inside the Line Item field block in Zapier, and you can’t set these fields as allowing multiples or altering dynamic fields.

Edit or remove Zapier line item group fields

Need to remove or reorder line item input fields? Open your Line Item Group field, and each input field has a gear icon beside it to edit or delete the field. You can’t move fields up or down, but you could delete fields then re-add them at the end of the list to get achieve the field order your integration needs.

How to Add Dynamic and Custom Fields

Add Zapier Dynamic Field

Dynamic Fields let Zapier build custom fields from an API call, and run code that shows fields based on other input field data. Dynamic and custom fields are used to show user-defined fields from apps that must be fetched from the app when users build Zaps to let them use those fields. These are especially useful with project management apps, CRM apps, databases, and any other app where users can add custom, user-defined fields.

To add a custom field, open your integration’s Input Designer, add a new, field and choose Dynamic Field.

In the code box, add custom code to make an API call and fetch the fields from your app. Use Zapier’s z.request to make the API call; see our Z Object docs for more details. Then have your code return the field key and names to Zapier in an array, to display in the user’s Zap.

When using dynamic fields, the fields will be retrieved in three different contexts:

  • Whenever the value of a field with altersDynamicFields is changed, as described above.
  • Whenever Zap Editor opens the “Set up” section for the trigger or action.
  • Whenever the Refresh Fields button is used on the trigger or action.

Be sure to set up your code accordingly - for example, don’t rely on any input fields already having a value, since they won’t have one the first time the “Set up” section loads.

Add Dynamic Field Based on Previous Input Field Data

To add a dynamic field that includes data from another input field or is only shown based on specific criteria, first add at least one input field that has Alters Dynamic Fields checked. This is the field that Zapier will use to decide if the dynamic field should be shown.

Then add the new dynamic field. From the Input Designer, add a new field and choose Dynamic Field.

There you can write JavaScript code that evaluates data from previous fields (referenced with bundle.inputData.field_key where field_key is replaced with the actual key of the field that Zapier is evaluating) and includes logic and details on another field to show depending on the value of the former.

You can then include this field in your API call using the key set in the code.

How to Include Dynamic Fields in API Calls

To use the custom fields in your API call, you must switch to Code Mode and make a custom API call that includes body: { ...bundle.inputData } to send every input field, including pre-defined and custom fields, in the body of the API call. Alternately, use the bundle.inputData in code mode along with individual listings of your pre-defined fields.

How to Test Dynamic Fields

When you add a dynamic field, it will not show in the Zap step preview on the right side of your input designer. That is expected, as Zapier will not run z.request call inside the Input Designer, so your custom fields will not show up in the preview.

Dynamic field inside a Zap

To test a dynamic field, create a new Zap and use the trigger or action that includes your dynamic step. You will then see the dynamic fields load inside your Zap as expected.

See Zapier dynamic field data from Monitoring tab

You can then see details about the dynamic field in the Monitoring tab in your integration’s Zapier Platform UI details editor. Click the Monitoring tab, then look through the API call details to find the details about the API call that fetched the dynamic fields.

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