monday.com Form Connect Boards & Mirror Column Limitations

Connect Boards and Mirror columns are powerful on monday.com boards. In forms? Connect Boards needs a logged-in submitter, and Mirror doesn’t exist.

Can you use monday.com Connect Boards and Mirror columns in forms? If you’ve tried building a form that writes to a Connect Boards column — or hoped to show mirrored data from a connected board inside a form — you’ve hit one of monday.com WorkForms’ hard walls. WorkForms has a Connect Boards question, but only for submitters who log in to monday.com and can access the connected board; Mirror columns aren’t supported at all (monday.com Help Center). BoardBridge doesn’t support either column type.

This isn’t about missing features. It’s about how these column types work at the API level. Here’s why they’re limited, what that means for form workflows, and what you can do instead.

Why monday.com Connect Boards Column Doesn’t Work in Public Forms

The limit: Connect Boards column can’t be populated via public form submissions

monday.com’s official documentation describes the limits (monday.com Help Center): the Connect Boards question requires “Require login to monday.com” and only shows to submitters who can access the connected board(s), and Mirror is not among the supported question types. An older community thread, “Support for connected board columns in WorkForms”, said connected board, people, mirror, dropdown and country columns were not supported; all but Mirror are supported question types today.

The Technical Reason

Connect Boards is a relational column type. It doesn’t store text or numbers — it stores references to items on other boards. When you link two items via Connect Boards, monday.com’s API expects a payload like this:

{ "item_ids": [123456789, 987654321] }

Those numbers are monday.com item IDs from the connected board. For a public-facing form to populate a Connect Boards column, it would need to:

1. Know the item IDs on the target board before the form is filled out
2. Let form submitters browse or search items from the connected board (exposing potentially sensitive data)
3. Handle multi-select (Connect Boards allows linking to multiple items)
4. Validate that the selected items still exist and are on the correct board

This creates a UX problem: how does a client filling out an intake form “select” an item from your internal Vendors board when they don’t have access to that board and don’t know the item IDs?

Real-World Example: Vendor Selection

Scenario: You have a Projects board and a Vendors board. The Projects board has a Connect Boards column linking to Vendors. You want a client intake form where the client selects a vendor, and that populates the Connect Boards link.

Why monday.com Mirror Columns Don’t Work in Forms

The limit: Mirror columns can’t be included in forms, so data that mirrors from connected boards is invisible to form submitters

Mirror columns don’t hold their own data. They show data from items connected via Connect Boards columns, and an edit made in a Mirror column is written back to the connected item. For example, if your Projects board has a Connect Boards link to Vendors, a Mirror column could display the vendor’s email address, phone number, or status.

The Technical Reason

Mirror columns are computed — monday.com calculates their values automatically based on the Connect Boards link. The API can read them but can’t update or clear them; they don’t accept change_column_value mutations.

Even if you could include a Mirror column in a form, it would only show another board’s value — there is nothing on the form’s own item to write. And since a Connect Boards question needs a logged-in submitter, a public form has no way to establish the relationship that Mirrors depend on.

Other Read-Only / Computed Columns

Mirror columns aren’t alone. Several monday.com column types are auto-calculated and can’t be written to:

These columns are useful on boards for tracking and calculations, but they don’t fit the form submission model — forms write data, these columns compute data.

What the Community Says About Connect Boards and Mirror Columns in Forms

Community feature requests to add connected board and mirror columns to forms go back years. Most of the column types those threads asked for (People, Dropdown, Country and Connect Boards) are now WorkForms question types (monday.com Help Center); Mirror is still missing. Response editing (Enterprise) also can’t change Signature or Connect Boards answers (monday.com Help Center).

Even Enterprise customers with monday.com’s response editing feature can’t edit Connect Boards answers after submission, and public submitters can’t see the question at all.

Competitor limitations:

• Fillout markets “choose and filter down records from multiple Monday tables” as a feature — but this creates new items on the form’s target board; it doesn’t write to Connect Boards columns.

Source: Fillout monday.com integration

• SuperForm supports many advanced column types (Dependencies, Tags, WorldClock, etc.) and advertises connected boards, mirror columns and data pulled from other boards; its product page doesn’t document whether a submission writes to a Connect Boards column.

Source: SuperForm features

For public submitters, the usual path is to create an item on a board that has Connect Boards columns, then link those items after submission.

Workarounds That Actually Work for Connect Boards and Mirror Columns

Since public forms can’t populate Connect Boards and no form populates Mirror columns, here’s how teams handle relational data:

Workaround 1: Dropdown with Manual Linking

Setup:

Best for: Low-volume intake where manual linking is acceptable

Workaround 2: Automation After Submission

Setup:

Best for: Small, stable sets of connections (under 10 options)

Workaround 3: Text Field with Lookup via API

Setup:

Best for: High-volume workflows where automation investment is justified

Workaround 4: Pre-Link, Then Update Other Fields

Setup:

1. Manually create items on your Projects board with Connect Boards links already established
2. Send form links that update existing items for other columns (status, notes, dates) but leave the Connect Boards link untouched
3. BoardBridge doesn’t write Connect Boards columns, so the link isn’t overwritten (its per-field overwrite protection covers the columns it does write)

Use case: Client intake where you pre-assign a vendor internally, then send the client a form to fill in project details. The vendor link stays intact; the client updates scope, dates, and deliverables.

Best for: Update-existing-item workflows where relationships are pre-defined

Need help setting up monday.com integration services with automated Connect Boards linking? TaskRhino offers custom workflow automation.

What Third-Party Apps Offer

SuperForm — a monday.com marketplace form app ($35-$520/month on paid tiers) — advertises connected boards, mirror columns and data pulled from other boards.

From SuperForm’s feature list:

“Supports Connect Boards, Mirror, Formula, Subitems, Dependencies, Tags, Hour, WorldClock, Week, and Item ID column types”

Its product page doesn’t document whether a form submission writes to a Connect Boards column, so test that before you rely on it (Spot-nik).

Fillout advertises “powerful multi-board workflows”; its docs describe update forms and record pickers across monday.com tables (Fillout).

Writing Connect Boards links from a public-facing form remains the hard part, because the submitter can’t see your boards.

What BoardBridge Doesn’t Do (And Won’t Pretend To)

BoardBridge does not support Connect Boards or Mirror columns in forms. We’re upfront about this because:

1. API complexity. Connect Boards requires item ID lookups, validation, and multi-select handling that breaks the simple form submission model.
2. Security concerns. Letting external users browse connected boards exposes internal data they shouldn’t see.
3. Workarounds are better UX. Dropdown columns with readable names + automation or manual linking is cleaner than asking form submitters to search for item IDs.

We’d rather be honest about limits than ship a feature that’s fragile and confusing.

What BoardBridge Does Support

While we can’t handle Connect Boards or Mirror, BoardBridge does solve several WorkForms gaps:

• Update existing items (not just create new ones) — one of the most-requested WorkForms features since 2020
• Dual-board mapping — one form writes to two boards simultaneously (different from Connect Boards — creates independent items, not relationships)
• Conditional logic with AND/OR operators on any plan — WorkForms logic is OR-only
• Rich HTML emails with CC/BCC groups and a custom sender name and reply-to
• Field types with read/write support, including text, email, phone, number, date, dropdown and location

For the column types we support, we support them fully — with pre-fill, validation, overwrite protection, and cross-board mapping.

Common Questions

Q: Can you use Connect Boards and Mirror columns in monday.com forms? A: Connect Boards, only partly; Mirror, no. WorkForms has a Connect Boards question, but it requires login to monday.com and only shows to submitters who can access the connected board(s). Mirror columns show values from connected items; the API can’t update them, and they aren’t a form question type.

Q: Will Connect Boards support ever be added to forms? A: It already exists for logged-in submitters who can access the connected board(s). For external users who can’t see your boards, Dropdown + automation is simpler and safer.

Q: Can I at least display Mirror column data in a form? A: No. Mirror is not a WorkForms question type, and on a public form there is no Connect Boards link for it to pull from. If you pre-link items manually, you could use a Text field to display mirrored data via API — but that’s a custom build, not a native form feature.

Q: What about Subitems — can forms create subitems? A: BoardBridge does not currently support subitem creation via forms. Subitems require parent item references and nested data structures that don’t fit the standard form submission model. This is another area where manual creation or automation is the better path.

Q: Can I use Connect Boards in the form’s target board, even if the form doesn’t populate it? A: Yes. Your target board can absolutely have Connect Boards and Mirror columns — they just won’t be editable via a public form. You’d link items manually or via automation after submission.

Q: Why do some apps claim to support Connect Boards if they can’t actually write to it? A: Check what “support” means. An app may display Connect Boards data (read-only), create items on boards that contain Connect Boards columns, or write the link itself. Always test before subscribing.

Q: Can I use monday.com’s automations to link items after form submission? A: Yes, with limitations. You can set up automations like “When Status = X, connect to Item Y on Board Z” — but a rule per possible connection becomes unmaintainable for 50+ vendors. monday.com also has a cross-board “create item in board & connect boards” automation (monday.com Help Center), and logged-in submitters can pick the linked item directly with the Connect Boards question.

Q: What if I use the form to update an item that already has Connect Boards links? A: The links stay intact. BoardBridge (and most form tools) won’t overwrite columns they don’t support. If your item is pre-linked to a vendor via Connect Boards, sending the form to update project details leaves the vendor link alone.

Q: Can I pre-fill a form with data from a connected board via Mirror columns? A: No. Since BoardBridge doesn’t read or write Connect Boards/Mirror columns, we can’t pull mirrored data for pre-fill. If you need to display vendor details to the form submitter, use a Text field populated via API before generating the form link.

Q: Are connected board columns and mirror columns supported in WorkForms? A: Connect Boards is, as a question for logged-in submitters who can access the connected board(s); Mirror is not. Conditional logic uses answers in the form, not live data from other boards. For public forms, use Dropdown + automation as a workaround.

Who This Matters To

This limitation affects teams who:

• Need client-facing forms that establish item relationships (projects → vendors, tasks → clients)
• Want form submitters to “select a vendor” and have that populate a Connect Boards link
• Expected Mirror columns to display related data inside forms
• Assumed Connect Boards “just works” like Dropdown or Status columns

If your workflow depends on Connect Boards relationships from form submissions, you’ll need automation, middleware, or manual linking as a follow-up step.

Need monday.com forms that update existing items, write to multiple boards, and include conditional logic? BoardBridge by TaskRhino handles what WorkForms can’t — with honest limits on relational columns. Book a free 30-minute consultation at https://calendly.com/rp-spaceo/call-with-rakesh-est-timezone

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