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# Elements of the flow - JSON string

The `JSON String` element can be used to create a JSON string as part of the flow.

**Configuration**

1️⃣ The input field allows you to map the JSON string. To do this, you can define variables similar to the `Merge strings` element, which are then filled with corresponding values from the flow. The variables must be escaped with `%` before and after the variable name.

2️⃣ This is where the variables are filled. Data from previous elements can be retrieved via the input function (rectangular symbol).


![](https://storage.crisp.chat/users/helpdesk/website/91fefd8b4b0ac000/flowjsonstringen_1dcdn65.png)