I want to parse stp file into Json format like get their coordinates, dimension, start and end point with cut and band.
It appears that you need to purchase a copy of the ISO 10303-21 Clear Text Encoding of the Exchange Structure standard for the file format specification, then you can write a parser. The format is text, so it is human-readable making it easy to test that your parser works. Alternatively, there is a C++ library you could either wrap or port, STEPcode · GitHub.
I learned all this from ISO 10303-21 - Wikipedia
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