Data file reader and writer

Name your CSV, Excel, JSON or Parquet file. Get it read or saved correctly, with errors fixed.

Data file reader and writer is a free AI skill for the job "Make documents, sheets and slides". Give the instructions to an AI assistant that supports the required files and tools, then review its output.

Free · No account · BSD 2 Clause licence · Made by MathWorks · Level: beginner · Thinking: low

Made by MathWorks. See the original on GitHub; we copied it as it is, with its licence.

What it does

Your CSV, Excel, JSON, Parquet or XML file loads correctly in MATLAB and saves back the way you need, with no silent damage. Many import bugs do not show errors, they just change your numbers. The skill uses the right import options for each file type and sets delimiters, locales and encodings. European files with comma decimals and semicolon separators are handled. After loading, it checks for corruption such as stray NaN values, 65535 placeholders and numbers turned into text. It decodes misleading error messages, reads from URLs and compressed files, handles awkward JSON keys, and swaps old fopen code for modern readlines and writelines. It needs MATLAB. Big files and database work go elsewhere.

You give it

The file or its address
What you want to read or save
The error message (optional)
Locale or encoding details (optional)

You get

Working read or write code
Import options set for your file
Corruption checks on loaded data
Explanation of any error

Use it when

A CSV opens with garbled columns or wrong decimals.
MATLAB says file not found but the file is right there.
You need data pulled from a web address into a table.
Old file reading code needs updating to modern commands.

How to use it

Add it to your AI once: download it and add the folder to Claude, ChatGPT or Codex as a skill.
Ask for the job in your own words. Your AI opens the skill when it fits.
It works best when your AI can run MATLAB.