# Mock Data

Users can now manually override DataHub variables using mock JSON data, directly from the DataHub. This ability allows configuring and testing step responses even before a workflow is synced, specifically within Code Runner and Formatter steps.

#### How It Works

* Locate a Code Runner or Formatter step in the DataHub.
* Click the mock data icon next to the step response.
* A popup will appear allowing you to edit and input mock JSON data.
* The provided mock data will:
  * override the existing response for that step.
  * be used as the response for downstream mapping or logic.
  * be replaced automatically when the workflow is synced and a realtime response is generated.

#### Use Case

This is particularly useful for:

* Testing workflows before real data is available
* Manually configuring mappings when building new flows
* Debugging formatters or custom logic using controlled input

#### Example

Mock JSON data:

```json
{
  "orderId": "12345",
  "status": "PENDING",
  "customer": {
    "id": "9876",
    "email": "test@example.com"
  }
}
```

This input will be treated as the step response for downstream mapping or transformation logic.

<figure><img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXfXHKmMVSJdCL6eI0hGiNbrUJp2q25DQKXAbj-udYCt8bMbgd4YPjsVMDmf_mur6U0CGzxSUwrZLigOMqlKtjj87n2Oa9gFAqN8Hpi9PWD5JtbvZptC4fGxHL-Xg3Q9CR3MLJ3oSQ?key=wC4f4SBvUvQBDAaSHX4Z5qRA" alt=""><figcaption></figcaption></figure>

<figure><img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXcT79yOnvawF1vnumCXadVHaPCbSWoCGXXsAZIyMW31VsMrTZqOQ5L9caRlYnjUuWJgGNzx3zKBxgeN4Gc4GY3fRp_iBvvKgtGxtM2wFzLmK9nvU68K5vZU6uSKKsXDjmwkcd_aBA?key=wC4f4SBvUvQBDAaSHX4Z5qRA" alt=""><figcaption></figcaption></figure>

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