Master JSON with Practical Guides
No-nonsense tutorials that get straight to the point. Learn JSON parsing, validation, formatting, and more — with examples that actually make sense.
Featured
Building AI Agents with JSON: Function Calling & Tool Use Guide
Learn how to build AI agents that can take actions using JSON function calling. Complete guide with OpenAI, Claude, and real-world examples.
JSON Mode in LLMs: Getting Structured Output from ChatGPT, Claude & Gemini
Master JSON mode in ChatGPT, Claude, and Gemini. Learn how to get guaranteed structured output from AI models.
AI + JSON Validation: Why Zod is Essential for LLM Apps
Learn why validating AI/LLM responses with Zod is critical for production apps. Prevent hallucinations and ensure type safety.
How to Read JSON in Every Major Language
Copy-paste JSON parsing code for Python, JavaScript, Java, C#, Go, PHP, Ruby, and Rust. The only cheat sheet you need.
Handling Large JSON Files: Streams vs Buffers
Learn how to process massive JSON files without crashing Node.js. Compare streaming parsers like stream-json and ndjson.
All Articles
17 articlesBuilding AI Agents with JSON: Function Calling & Tool Use Guide
Learn how to build AI agents that can take actions using JSON function calling. Complete guide with OpenAI, Claude, and real-world examples.
JSON Mode in LLMs: Getting Structured Output from ChatGPT, Claude & Gemini
Master JSON mode in ChatGPT, Claude, and Gemini. Learn how to get guaranteed structured output from AI models.
How AI Uses JSON: The Complete 2025 Guide
Discover how AI and LLMs use JSON for structured output, function calling, and data exchange. Essential guide for AI developers.
AI + JSON Validation: Why Zod is Essential for LLM Apps
Learn why validating AI/LLM responses with Zod is critical for production apps. Prevent hallucinations and ensure type safety.
The BigInt Problem: Why JSON Breaks Large Numbers
Learn why JSON silently corrupts numbers > 2^53 and how to fix it. Essential for financial apps and APIs.
How to Read JSON in Every Major Language
Copy-paste JSON parsing code for Python, JavaScript, Java, C#, Go, PHP, Ruby, and Rust. The only cheat sheet you need.
Handling Large JSON Files: Streams vs Buffers
Learn how to process massive JSON files without crashing Node.js. Compare streaming parsers like stream-json and ndjson.
JSON vs XML: Which Should You Use in 2025?
The ultimate showdown between JSON and XML. We break down when to use each, with real examples and honest opinions.
How to Parse JSON in JavaScript
Master JSON.parse() and JSON.stringify() with practical examples. Handle errors like a pro and avoid common pitfalls.
JSON Schema: The Ultimate Validation Guide
Learn to validate JSON data with JSON Schema. From basic types to complex nested structures — with examples that actually make sense.
JSON Formatting Best Practices
Write JSON that humans can actually read. Formatting tips, conventions, and tools that will make your data beautiful.
Converting JSON to YAML (and Back)
The complete guide to JSON-YAML conversion. Why you'd want to, how to do it, and what to watch out for.
Working with JSON APIs
From fetching data to handling responses — everything you need to know about consuming and building JSON APIs.
JSONPath: Query Data Like a Pro
Extract exactly the data you need from complex JSON. Learn JSONPath expressions with practical examples.
Common JSON Errors and How to Fix Them
Tired of cryptic JSON errors? Here's your troubleshooting guide with solutions for every common mistake.
JSON Arrays and Objects: A Visual Guide
Finally understand the difference between JSON arrays and objects. Visual examples that make it click.
What is JSON? The Complete Beginner's Guide
Everything you need to know about JSON — from basic syntax to real-world applications. No fluff, just the good stuff.
Ready to put your knowledge into practice?
Try our free JSON tools — format, validate, convert, and more. All processing happens in your browser.
Open JSON Tools