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Gabor Szabo
Gabor Szabo

Posted on β€’ Originally published at szabgab.com

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Reading and parsing JSON in general and specifically in Rust πŸ¦€

Tomorrow I am going to give a presentation about "Reading and parsing JSON in Rust".

As a last minute preparation I'd like to go over the main cases I need to cover. Maybe some of my readers will have ideas what else to show.

❓ What is JSON❓

πŸŽƒ Reading an arbitrary JSON file without knowing it internal structure. Regardless if the main element is an object or an array. (a mapping or a list)

πŸ€– Reading a JSON which is a plain array of values.

πŸ‘Ή Reading a JSON which a single level object, key-value pairs of arbitrary values of some known type. e.g string-string pairs or string-number pairs.

πŸ‘Ώ Defining some of the fields in a JSON object.

πŸ‘Ύ Defining all the fields of the JSON object and making sure the JSON we read in does not have any extra fields.

πŸ‘½ Reading a JSON where a certain field can either have a single value or a vector as a value. In some unfortunate case we might have both language: English and language: [English, Spanish] in different files.

πŸ₯· Making sure all the expected fields exist in the file.

🀑 Reading JSON where the field name is not valid attribute in our language. e.g. Most programming language will not allow an a variable or an attribute to have a dash - in them. So a field called runs-on cannot be mapped directly to an attribute.

🧢 Reading a JSON-Lines file with multiple JSON structures where each JSON structure is on a separate physical row.

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