we use the PDI8.1,and want to import the json file into the database,but we can't find the json input .
The trick may be that the JSON Input step is only available in a transformation, not in a job.
Try creating a Transformation rather than a Job and you'll find it right under the Input options under the Design tab (you can also enter JSON into the field next to the Steps label and the step tree will find the two entries for input or output of JSON).
I can search Json input and out from PDI 7.1 but not PDI 8.1
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