Computed fields

Computed fields generate their own value. Submitters never type into them: they fill in the entered fields, and Terminus Hub produces the computed values from those inputs or from system rules.

Choose a computed type

You need	Use	Notes
One value stitched together from several fields, like a campaign name	Concatenation	Joins other fields’ values with a separator.
A value derived from other fields with transforms or if/else logic	Auto-fill	Copies one field and reshapes it, or evaluates an expression.
A landing page URL with UTM or other query parameters	Tagged URL	See the UTM recipe.
A short link nobody can customize	Short URL	Computed only with the Auto-generated, read-only slug mode. See slug modes. At most one per taxonomy.
A scannable code for a link or value	QR Code	Encodes another field’s value.
Sequential, zero-padded numbers	Auto Number	Never reissues a number. The counter belongs to the field, so every taxonomy that uses it shares one sequence.
An unguessable token per record	Random	Generated once, then kept. Not checked for collisions, so do not use it as a key.
The same fixed value on every record	Constant	Useful as a version tag or a literal segment in a Concatenation.
The record’s own unique identifier	Terminus ID	Globally unique and never changes. At most one per taxonomy.

When you need a value that is guaranteed unique, use Terminus ID or Auto Number, not Random.

Rules every computed field follows

Always required. The Required toggle is locked on with “Computed fields are always required and cannot be made optional.”

Inputs must be in the taxonomy. A computed field can only read fields that are placed in the same taxonomy. When one is missing, the taxonomy editor lists it under Missing dependencies, and the taxonomy cannot be picked for new submissions until you add it.

The type is fixed once created. If you picked the wrong type, add a new field of the right type and remove the old one. Deleting a field takes it out of every taxonomy in your draft. If another field still reads from it, publish stays blocked until you fix that reference.

For the settings of each type, open its page from the table above. For every field type, entered and computed, see the Fields reference.

Fields

Picklists

Settings and limits

Choose a computed type

Rules every computed field follows

​Choose a computed type

​Rules every computed field follows

​Related

Choose a computed type

Rules every computed field follows

Related