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Is this the question related with apex listener?
Yes, as I use Apex listener to expose REST web sevices via Resource templates.
Use a CLOB instead. A BLOB could contain any kind of data, so we can't safely assume a BLOB contains text content (JSON being a textual format), or even assume how text content in the BLOB might be encoded. So you'll need to convert the BLOB to a CLOB (or VARCHAR if it's small enough) instead.