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JSON structures can contain nested objects and arrays, which naturally form a tree-like structure. Recursion simplifies the parsing logic by allowing each nested structure to be handled with the same parsing function.
Yes, parsing-related problems are common in technical interviews at top tech companies. They test understanding of string processing, recursion, stacks, and careful handling of edge cases.
A combination of recursion and stacks works well for this problem. Stacks help track nested objects and arrays, while maps and lists are used to construct the final object representation.
The optimal approach is to implement a recursive descent parser that processes the JSON string character by character. It identifies structures like objects, arrays, and primitive values and recursively builds the corresponding data structure.