> ## Documentation Index > Fetch the complete documentation index at: https://docs.bluprynt.com/llms.txt > Use this file to discover all available pages before exploring further. # Form builder > Add fields, set validation and conditions, and group questions into sections. The form builder is step 3 of the [Form manager](/proof/form-manager). You add the questions issuers answer, pick a field type for each, and set validation and conditions. Admins use it to turn a regulatory requirement into structured, checkable answers. ## Key concepts | Term | Meaning | | - | - | | **Field** | One question. It has a type, a label and optional validation. | | **Section** | A group of fields. Sections become tabs in the application view. | | **Reference ID** | A stable key for the field's answer | | **Validation** | Rules an answer must meet, such as **Required** or a maximum length. | | **Condition** | A rule that shows a field or section only when another answer matches | | **Raw** | The form definition as JSON. | ## How it works ```mermaid theme={"system"} flowchart TD A[Add Item] --> B[Pick a field type] B --> C[Edit label and help text] C --> D[Set validation] D --> E[Add a condition] E --> F[Save] ``` Issuers see each field as an input. The Compliance Hub checks every answer against its validation before the issuer can submit. ## Build a form Each row is a field. Fields marked **Required** must be answered. Use the icons on the right to duplicate, edit or delete a field. Drag the handle on the left to reorder. Click **Raw** (3) to see the JSON. Click **Add Item** (2) to add a field. Form Builder with four text fields, Name marked Required, and callouts on Add Item and Raw Choose a type from the menu (1). **Section** adds a group for other fields. Add Item menu listing Static text, Text, Number, Boolean, Date, Select, Multi-select, File, Blockchain address, Sustainability, Array, Table / rows and Section Click the pencil on a field to open **Edit field**. Check the **Type** (1). Fill **Label**, **Description**, **Reference ID**, **Placeholder** and **Answer guidelines**. Under **Validation** (2), tick **Required** and set the limits for the type. Click **Save**. Edit field panel for a Text field labelled Name, with callouts on Type and the Required validation checkbox Click **Next** to set the [approval workflow](/proof/approval-workflow). ## Reference ### Field types | Menu label | Engine type | What the issuer gives | | - | - | - | | **Static text** | `static` | Nothing. Display-only text, never validated. | | **Text** | `string` | Free text | | **Number** | `number` | A number | | **Boolean** | `boolean` | True or false | | **Date** | `date` | A date, stored as ISO 8601 | | **Select** | `select` | One option from your list | | **Multi-select** | `multiselect` | Any number of options from your list | | **File** | `file` | An upload. The name, MIME type, size and URL are stored. | | **Blockchain address** | `blockchain` | A CAIP address for an on-chain asset. The format isn't checked. | | **Sustainability** | `sustainability` | Sustainability data for an on-chain asset: `address`, `ccri` and `cmc` | | **Array** | `array` | An ordered list of values of one non-list type | | **Table / rows** | `array_obj` | An ordered list of rows. Each row has one value per sub-field. | | **Section** | `section` | Nothing. A container for other fields. | ### Validation by type | Type | Rules | | - | - | | Text | Required, minimum length, maximum length, pattern with a custom message | | Number | Required, minimum, maximum | | Date | Required, earliest date, latest date | | Array, Table / rows | Minimum items, maximum items | | File, Blockchain address, Sustainability | Required | ### Field settings | Setting | Use | | - | - | | **Label** | The question. Required. | | **Description** | Help text under the question | | **Reference ID** | Stable key used by conditions | | **Placeholder** | Example text inside an empty input | | **Answer guidelines** | Guidance on what a good answer contains | | **Conditional** | Show the field only when a rule matches. Pick the other field from **Select field...**, then an operator and a value. The operators offered depend on that field's type. **Static text** can't be used in a condition. | ### Condition operators | Operator | Matches when the other answer… | | - | - | | `set` / `notset` | has a value / has no value | | `eq` / `ne` | equals / doesn't equal a value | | `lt` / `gt` | is less / greater than a value | | `lte` / `gte` | is less or equal / greater or equal | | `in` / `notin` | is / isn't in a list of values | | `and` / `or` | combines several rules: all must match / any must match | ## Worked example Your licence form must ask for reserves only from fiat-backed issuers. You add a **Select** field *Backing type* with the options *Fiat* and *Crypto*. You add a **File** field *Reserve attestation*, tick **Required**, and under **Conditional** pick *Backing type*, `eq` and *Fiat*. Issuers who pick *Crypto* never see the upload. ## Errors and troubleshooting | Problem | Cause | What to do | | - | - | - | | Issuer can't submit | An answer fails validation, or a required field is empty | Check the field's **Validation** settings. | | A conditional field never shows | The condition points at the wrong field or value | Open **Edit field** and check the rule. | | An address is accepted in any format | **Blockchain address** doesn't check format | Ask for the network too, or add guidance. | ## FAQ Click **Raw** to see the form definition. Use it to check structure and reference IDs. No. It shows instructions or legal text and holds no value. Use **Table / rows** when each entry has several parts, such as a director's name, role and country. Use **Array** for a list of single values. ## Related pages * [Form manager](/proof/form-manager) * [Approval workflow](/proof/approval-workflow) * [Applications](/proof/applications) This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.