… but I ended up writing one of the fastest JavaScript CSV parsers out there. See the benchmark and learn what makes the csv42 library so fast.
Json Editor Online
Parse IndepthJSON is a data interchange format, and at the core it is about stringifying and parsing JSON from text into a data object and vice versa. Read more about this in the following articles.

JSON to TypeScript, 4 different approaches
You can blindly cast the data to your TypeScript model, but there is more to this: ideally you validate your data before casting it. Learn how to go about this.
Why JSON comments are not allowed and what to do about it
The issue originates from using JSON for configuration files, whereas JSON is a data format in the first place. Learn what you can do about it.
Why does JSON.parse corrupt large numbers and how to solve this?
Since the early days of JSON Editor Online, more than 10 years ago, users regularly reported issues of the editor sometimes corrupting large numbers in their JSON documents. We haven’t been able to solve this until now. In this article we explain the problem in-depth and show how we solved it in JSON Editor Online.
How to fix JSON and validate it with ease
How can you figure out what is wrong, without spending too much time on it? And, of course, how to solve the problem and fix JSON?
JSON date format: 3 ways to work with dates in JSON
What is the “right” JSON date format? This article explains three solutions, including the ISO 8601 date string which which is normally the best approach.
Parse JSON: What is JSON parsing and how does it work?
When you parse JSON, you convert a string containing a JSON document into a structured data object that you can operate on. Learn how this works.