---
title: "Add Property to JSON"
slug: "add-property-to-json"
updated: 2026-08-14T21:28:31Z
published: 2026-08-14T21:28:31Z
canonical: "documentation.decisions.com/add-property-to-json"
---

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

# Add Property to JSON

| ## Step Details |
| --- |
| **Introduced in Version** | 9.30.0 |
| **Last Modified in Version** | 9.30.0 |
| **Location** | Data > JSON |

The **Add Property to JSON** step adds a new property and value to an existing JSON string.

This step is useful when the Flow needs to modify a JSON payload directly before passing it to another step, storing it, or sending it to an external system.

---

## Properties

#### Parameters

| Property | Description | Data Type |
| --- | --- | --- |
| Type | Select the data type for the value being added to the JSON string. | --- |
| Property Name | Enter the name of the property to add to the JSON string. | --- |

#### Inputs

| Property | Description | Data Type |
| --- | --- | --- |
| Json Text | Specify the JSON text where the property is added. | String |
| Value | Specify the value to assign to the new JSON property. The value matches the selected **Type**. | --- |

#### Outputs

| Property | Description | Data Type |
| --- | --- | --- |
| AddPropertytoJSON_Output | Returns the JSON string with the added property. | String |

#### ![](https://cdn.document360.io/6ef8bcc1-6489-4486-9ad1-83acff7e5df0/Images/Documentation/Add%20Property%20to%20JSON(1).png)

### Common Use Cases

- Add a new field to an existing JSON string.
- Add an ID, status, or reference value to JSON data.
- Build or update a JSON payload before sending it to an API.
- Add values collected from Forms, Rules, or previous Flow steps.
- Add nested properties when the JSON structure requires a nested path.