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JS O N Library for LL Ms
Info
The JS O N Library for LL Ms is a Library for MetaTrader 5 that high-performance json (v3. 5.
Usage
This tool is typically used for enhancing chart analysis and decision making.
Platform
This Library works exclusively on MetaTrader 5 (both build 600+ and newer versions).
Setup
Place the downloaded file in MQL5/Libraries folder via File ? Open Data Folder in MetaTrader 5.
How to Install and Use JS O N Library for LL Ms
1. Storage: Place library files in the MQL/Libraries directory to ensure they are accessible to your projects.
2. Implementation: Include the library in your code using the #import directive, ensuring you match the exact function names and parameters.
3. Compilation: Ensure the library is present in the directory before you compile your main EA or script, as the compiler links them during this phase.
4. Management: Keep libraries organized in sub-folders if you manage many custom functions to maintain a clean project structure.
Frequently Asked Questions
Q: What is a library file used for? A: Libraries store reusable code modules, allowing you to centralize common logic used by multiple EAs or indicators.
Q: Is a library executable? A: No, libraries are non-executable files containing functions; they must be imported into an EA, indicator, or script to function.
Q: Can I update a library while the platform is running? A: You should compile your EA or script after updating a library to ensure the latest code changes are integrated.
What this tool does
High-Performance JSON (v3.
Typical Use Case
This Library excels in automated trading and technical analysis on MetaTrader 5.
Compatible Platform & Setup
This Library works on MetaTrader 5. Place the file in the MQL5/Libraries folder and restart the terminal.
Description & Settings
Related: Session Time Filter Library - another powerful library for MetaTrader 5 traders.
High-Performance JSON (v3.5.0)
A JSON library designed for LLMs, Autonomous Trading and Ultra-Low Latency. The Problem
Also recommended: AS Q Neural Net Pure MQ L5 Neural Network Library - similar library with strong performance on MetaTrader 5.
When integrating AI models (GPT-4o, Claude 3.5, DeepSeek) into MetaTrader 5, the community's standard libraries failed on two critical points:Memory Allocation
and
Serialisation Latency
. The excessive use of recursion and temporary strings turned the processing of AI responses (Function Calling) into bottlenecks that froze the terminal. The "pain" of losing ticks while the Garbage Collector cleared strings was what motivated this architecture.
fast_json architecture
Rewritten from scratch with an obsessive focus on performance:
Zero-Allocation Architecture
: Parsing via Tape (contiguous buffer long[] ) and Direct Serialisation in buffer uchar[] . We eliminate intermediaries: the payload goes from the socket straight to the data structure without creating thousands of objects.
Hybrid Numeric Parsing
: In v3.4.0, we introduced integer accumulation via long (native ALU) and static Exp10 lookup tables for maximum precision in floating-points.
Iterative State Machine
: Goodbye recursion. A linear parser prevents Stack Overflow even in deeply nested JSONs.
SWAR Scanning
: SIMD reading (8 bytes per cycle) to skip whitespace and long strings. Performance
Tests carried out on standard hardware (x64) with a complex payload of 50,000 nodes:
> Results verifiable via TestJsonBenchmark.mq5 script included in the package.
Key Features
HFT resilience
: Deterministic memory allocation. Garbage Collector does not intervene during parse.
O(1) Introspection
: Check HasKey() keys or Size() arrays instantly, without linear scanning.
Type Safety
: Strict type access ( GetInt , GetDouble , GetString ). No magic variants that cause silent bugs.
Accurate Error Reporting
: In case of failure, returns exact Row and Column. Usage Example: Reading OpenAI Response Example: Building Request (Optimised Builder)
Developed by Jonathan Pereira as the core infrastructure of the
AI-Toolkit
framework.
You may also like: Institutional Kelly-VA P S Risk Engine (Library) - excellent alternative for library users on MetaTrader 5.
⚠ Limitations & Risk Warning
- This tool is provided for educational and testing purposes only.
- Past performance does not guarantee future results.
- Trading involves substantial risk of loss. Use on a demo account first.
- Results may vary depending on market conditions, broker, and settings.
- We recommend thorough backtesting and forward testing before using with real funds.