I returned a clean json file but in the postman i get backslash added in the json after every "

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1

I returned a clean JSON file in my code like this

image_2020_08_13T10_58_01_572Z
image_2020_08_13T10_58_01_572Z1308×205 14.7 KB

And got something like this.

image_2020_08_13T09_30_12_009Z1
image_2020_08_13T09_30_12_009Z1990×460 33.7 KB

can you help me how can I fix the backslash in the output of the postman?