# Is JSON transform action
## Use case
You are working with an API and the return comes back as a JSON string instead of being a JSON object. You would like to verify that the string is valid JSON before attempting to convert it to JSON.
## Overview
This transform will check whether or not a string provided via the 'String to Check' input is a valid JSON string.
## Parameters
Parameter
Description
Required
String to Check
The string to validate.
true
{% hint style="info" %}
This transform is useful for confirming a string is a valid JSON string prior to converting it to json using a filter such as `|json`
{% endhint %}
## Usage
Example 1: Providing a valid JSON string
Input:
```
{"test":"test"}
```
Example 2: Providing a invalid JSON string
Input:
```
I am not a JSON string!
```
## Results output
\
This transform will output a boolean value (True/False) based on whether or not the string is a valid JSON string.
Return from Example 1:
```json
True
```
Return from Example 2:
```json
False
```
