HubSpot Forms

Name: Forms API
Brand: Forms
Availability: InStock

✓ Official Vendor SpecMarketingMarketing Automationoauth26 EndpointsREST

Install Jentic One Beta

Connect the Forms to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Forms, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.

Step 1: Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with Forms API.

Create a new HubSpot form definition with a typed field schema and submit button configuration

Update an existing form's fields, redirect URL, and notification settings without recreating the form

Retrieve a single form by id including its full field schema for client-side rendering

GET STARTED

Start building with Forms API

Explore with Jentic

View OpenAPI Document

For Agents

Create, update, and manage HubSpot lead-capture form definitions that drive contact creation across landing pages, embedded widgets, and pop-up CTAs.

Use for: I need to create a new HubSpot lead-capture form, Update the field list on an existing form, Retrieve the schema of a form by its id, List all forms in my HubSpot account

Not supported: Does not submit form responses, manage contact records, or render landing pages - use for creating and managing form definitions only.

Use Cases

Patterns agents use Forms API for, with concrete tasks.

★ Programmatic Form Provisioning

Provision lead-capture forms from code so each new campaign launch ships with its tracked form definition rather than a manual click-through. POST /marketing/v3/forms/ accepts a typed field schema, submit button label, and redirect URL, returning the form id you can embed on landing pages or load via the JS embed snippet. Useful for marketing-ops teams managing dozens of campaign forms a quarter.

Call POST /marketing/v3/forms/ with name=Q3 demo request, fieldGroups containing email and firstName fields, and a submitButtonText value.

Form Schema Synchronisation

Keep a form definition in sync with downstream consumers (a custom front-end, a no-code page builder) by retrieving the full schema via GET /marketing/v3/forms/{formId}. The response includes every field group, display config, and submission action, so an agent can render the form server-side or validate inputs against the same schema HubSpot enforces.

Call GET /marketing/v3/forms/{formId} and use the returned fieldGroups array to render an HTML form in your application.

Form Lifecycle Management

Retire forms that are no longer in use to keep the admin UI clean and prevent stale forms from accidentally collecting low-quality leads. Listing forms with paging, then DELETE /marketing/v3/forms/{formId} for the obsolete ones, gives marketing-ops a scriptable cleanup path. Useful for end-of-quarter housekeeping.

Call GET /marketing/v3/forms/ to list forms, filter by name pattern, then call DELETE /marketing/v3/forms/{formId} for each obsolete entry.

AI Agent Form Bootstrap via Jentic

An AI agent setting up a new product launch creates the campaign's lead-capture form by searching Jentic for HubSpot form-creation operations, loading the schema for POST /marketing/v3/forms/, and submitting the field configuration. Jentic stores the OAuth credential so the agent never handles raw tokens, and the search-load-execute flow takes seconds.

Search Jentic for "create hubspot form", load the schema for POST /marketing/v3/forms/, and execute with the field configuration.

Key Endpoints

6 endpoints — the hubspot forms api manages the lead-capture form definitions that power landing pages, embedded widgets, and pop-up ctas in a hubspot account.

METHOD

PATH

DESCRIPTION

GET

/marketing/v3/forms/

List all forms in the account

POST

/marketing/v3/forms/

Create a new form definition

GET

/marketing/v3/forms/{formId}

Retrieve a form by id

PATCH

/marketing/v3/forms/{formId}

Update an existing form

DELETE

/marketing/v3/forms/{formId}

Delete a form

GET

/marketing/v3/forms/

List all forms in the account

POST

/marketing/v3/forms/

Create a new form definition

GET

/marketing/v3/forms/{formId}

Retrieve a form by id

PATCH

/marketing/v3/forms/{formId}

Update an existing form

DELETE

/marketing/v3/forms/{formId}

Delete a form

Why Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Your HubSpot access token is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.

Intent-based discovery

Agents search Jentic by intent such as 'create a HubSpot form' or 'update a form definition', and Jentic returns the matching Forms operation with its input schema so the agent calls the right endpoint without browsing the reference docs.

Time to first call

FAQs

Specific to using Forms API through Jentic.

What authentication does the Forms API use?

The API accepts HubSpot OAuth 2.0 access tokens or private app tokens (legacy schemes oauth2_legacy and private_apps_legacy) sent as Bearer in the Authorization header. Through Jentic, the token is stored encrypted in your Jentic One instance so the agent never sees the raw secret.

Can I create a form with custom fields via the API?

Yes. POST /marketing/v3/forms/ accepts a fieldGroups array where each group lists the typed fields (text, email, dropdown, etc.) to render. Field metadata such as required status and validation rules are set per field.

How do I render a HubSpot form on my own front-end?

Call GET /marketing/v3/forms/{formId} to retrieve the full field schema, then render the fields client-side and POST submissions to HubSpot's submission endpoint. The schema includes labels, types, and validation hints.

What are the rate limits for the Forms API?

Account-level limits are 100 requests per 10 seconds across HubSpot's authenticated APIs, with daily caps that depend on the subscription tier. Cache form definitions in your application to reduce repeat reads.

How do I create a form through Jentic?

Run pip install jentic, search for "create hubspot form", load the schema for POST /marketing/v3/forms/, and execute with name and fieldGroups. Run Jentic One, the self-hosted execution layer, to get an ak_* key.

Does deleting a form remove its historical submissions?

No. DELETE /marketing/v3/forms/{formId} removes the form definition so it can no longer accept new submissions, but historical submissions remain attached to the contact records they created or updated.

Can I limit what my agent is allowed to do with the HubSpot Forms API?

Yes. Because you run Jentic One yourself, your own rules decide which of the Forms operations the agent may call, so you can grant it GET and PATCH on /marketing/v3/forms/{formId} while leaving DELETE /marketing/v3/forms/{formId} out entirely. Since the form id sits in the URL path, a rule can pin the agent to a single form for reads and updates rather than the whole account. Your HubSpot access token is held by your own instance and injected at execution time, so the agent only ever calls the exact operations you allowed.

HubSpot Forms

Connect the Forms to your agent

Capabilities

Start building with Forms API

Use Cases

Key Endpoints

Why Jentic?

Related APIs

FAQs