react-papaparse
The fastest in-browser CSV (or delimited text) parser for React. It is full of useful features such as CSVReader, CSVDownloader, readString, jsonToCSV, readRemoteFile, ... etc.
deepjsontocsv
A TypeScript utility for converting deeply nested JSON objects or arrays into CSV format. This library flattens nested objects and arrays, allowing you to easily generate CSV files from complex JSON structures.
parse-json-to-csv
This is a simple Javscript library that converts a JSON object to a CSV file.