MT5 Data Structure

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Hello, everyone. I am new to this forum, but I want to ask if is there any documentation out there about Data Structure when extracting data from MT5 using API? I have a sample of extracted data, but I want to create my own documentation for a company that explains the descriptions of each columns. I hope to receive some help. Thank you!
 
Mat:
Hello, everyone. I am new to this forum, but I want to ask if is there any documentation out there about Data Structure when extracting data from MT5 using API? I have a sample of extracted data, but I want to create my own documentation for a company that explains the descriptions of each columns. I hope to receive some help. Thank you!

Your question is unclear.

What API ? What data structure ? 

If you have a sample, please show it.

 
Alain Verleyen #:

Your question is unclear.

What API ? What data structure ? 

If you have a sample, please show it.

API is an Application Program Interface, you use it connect with the backend software, specifically to retrieve data. Say I want to retrieve a Trade History for my account in MT5, in a format that a computer can read like JSON() or excel file format, I use API to do that. Data structure refers to how data is being structured, say in excel format there are columns like AccountID, TradeTime, OpenPrice, etc... What I want is a documentation that explains these columns.
 
Mat #:
API is an Application Program Interface, you use it connect with the backend software, specifically to retrieve data. Say I want to retrieve a Trade History for my account in MT5, in a format that a computer can read like JSON() or excel file format, I use API to do that. Data structure refers to how data is being structured, say in excel format there are columns like AccountID, TradeTime, OpenPrice, etc... What I want is a documentation that explains these columns.

I know what an API and a data Structure are. 

I was asking you concrete information about your issue.

 
Mat #:
API is an Application Program Interface, you use it connect with the backend software, specifically to retrieve data. Say I want to retrieve a Trade History for my account in MT5, in a format that a computer can read like JSON() or excel file format, I use API to do that. Data structure refers to how data is being structured, say in excel format there are columns like AccountID, TradeTime, OpenPrice, etc... What I want is a documentation that explains these columns.

Aside from Export[ing] chart data in .csv format via the MT5 UI, the MQL5 Data Structures are merely that─programmatic structures. The "structuring" of the .csv (or .xlsx) spreadsheet columns is implemented in your custom file-writing MQL5 code. There is not official MQL5 documentation for every implementation of every coder, but here is a simple example thereof:

Articles

Introduction to MQL5 (Part 40): Beginner Guide to File Handling in MQL5 (II)

Israel Pelumi Abioye, 2026.02.17 14:34

Create a CSV trading journal in MQL5 by reading account history over a defined period and writing structured records to file. The article explains deal counting, ticket retrieval, symbol and order type decoding, and capturing entry (lot, time, price, SL/TP) and exit (time, price, profit, result) data with dynamic arrays. The result is an organized, persistent log suitable for analysis and reporting.

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