> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zapier.com/llms.txt
> Use this file to discover all available pages before exploring further.

# What's changed in v18.4.0

> JSON input field type, `versions` command improvements, function-based dynamic dropdown fix

*Released: 2026-04-06*

This release introduces the new `json` input field type, improved `zapier versions` output, and a schema validation fix.

You can now accept structured JSON input from users with the new [`json` field type](/integrations/build-cli/input-fields#json-fields). Optionally provide a `schema` to validate and describe the expected shape:

```javascript theme={null}
{
  key: 'product',
  type: 'json',
  label: 'Product',
  helpText: 'Enter a JSON object',
  schema: {
    type: 'object',
    properties: {
      name: { type: 'string' },
      price: { type: 'integer' },
    },
    required: ['name'],
  },
}
```

We also fixed a bug where pushing code with [function-based dynamic dropdowns](/integrations/build-cli/dynamic-dropdowns#function-based-dynamic-dropdowns-perform) caused an unexpected validation error on the server. If you want to use function-based dynamic dropdowns, upgrade to 18.4.0 or later:

```javascript theme={null}
{
  key: 'project_id',
  label: 'Project',
  type: 'string',
  required: true,
  choices: {
    perform: async (z, bundle) => {
      const response = await z.request('https://api.example.com/projects');
      return {
        results: response.data.map((project) => ({
          id: project.id,
          label: project.name,
        })),
        paging_token: null,
      };
    },
  },
}
```

## cli

* 💅 Clarify `zapier-platform versions` timestamps with separate "Created at" and "Updated at" columns ([#1275](https://github.com/zapier/zapier-platform/pull/1275))

## core

* 🎉 Add JSON field type handling with schema-aware TypeScript inference ([#1273](https://github.com/zapier/zapier-platform/pull/1273))

## schema

* 🎉 Add JSON input field type with optional `schema` property for structured data ([#1265](https://github.com/zapier/zapier-platform/pull/1265))
* 🎉 Validate `schema` property on JSON fields against JSON Schema meta-schema ([#1267](https://github.com/zapier/zapier-platform/pull/1267))
* 🐛 Fix oneOf ambiguity in FieldChoicesSchema that caused server-side validation errors for function-based dynamic dropdowns ([#1268](https://github.com/zapier/zapier-platform/pull/1268))
* 📜 Update `skipThrowForStatus` documentation to note 401 errors are not subject to the flag ([#1270](https://github.com/zapier/zapier-platform/pull/1270))

## misc

* 🔨 Improve publish workflow with path filters and boilerplate build fixes ([#1264](https://github.com/zapier/zapier-platform/pull/1264), [#1266](https://github.com/zapier/zapier-platform/pull/1266))