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Is there a way to validate the structure of a json object ? #604
Description
Suppose I parsed a string from an unreliable source.
How can I validate the result json object ? (make sure it has certain structure / contents. Such as a list of 3 numbers and then a string ?)
Other than using a long boilerplate code with size() and get<>() and is_* ?
Activity
pboettch commentedon Jun 3, 2017
To validate a json instance or document, the json-schema.org has defined "a vocabulary that allows you to annotate and validate JSON documents" (citation from their site).
To my knowledge, there are two libraries written in C++ on github. One written by me, which supports draft4-version of json-schema.org only and is entirely based on this (nlohmann/json) library for json-parsing.
And there is valijson by Tristan Penman which does support other C++ json-parsers as well.
nlohmann commentedon Jun 4, 2017
@pboettch is right - JSON Schema is the tool to use here. It lets you specify your requirements with a JSON document and avoids manual checks.