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Guides

Hands-on articles about working with JSON — start with "What Is JSON?" and follow the links.

authentication

authentication

JWT pitfalls and best practices

Five common JWT footguns — alg=none, weak HMAC keys, missing exp, trusting kid blindly, mixing JWS and JWE — and how to avoid each one in 2026.

performance

performance

Working With Large JSON Files

Strategies for JSON files that don't fit comfortably in memory — streaming parsers, NDJSON, chunking, compression, and tooling that doesn't choke.

intro

intro

What Is JSON? A Practical Introduction

JSON is the most common data-interchange format on the web. This guide explains its value types, syntax, and the gotchas that trip people up.

language

language

Safely Parsing JSON in JavaScript

JSON.parse looks simple but has sharp edges — prototype pollution, BigInt, untrusted input. A practical checklist for parsing JSON in production JS.

language

JSON to TypeScript in Practice

Generate TypeScript types from JSON samples — handling optional fields, nullable, unions, nested types — plus runtime validation strategies.

best-practices

best-practices

Minify vs Prettify JSON: When and Why

Whitespace doesn't change JSON's meaning, but it changes everything else — transfer size, debuggability, diff quality. When to use each.

best-practices

JSON Best Practices for REST APIs

Naming, dates, IDs, error envelopes, pagination, versioning — the JSON design decisions that age well, plus the ones that don't.

query

query

JSONPath Explained: Query Your JSON

JSONPath syntax — root, child, recursive descent, slices, filters — with real queries against a sample document. Plus jq and JMESPath comparison.

format-comparison

format-comparison

JSON vs YAML vs XML: Which Data Format to Use

Side-by-side comparison of JSON, YAML, and XML with the same payload, data-type support, and concrete recommendations for when to pick each.

conversion

conversion

JSON to CSV: Flattening Nested Data

How to convert nested JSON into flat CSV rows — dotted keys, array handling, escaping, encoding. Real examples plus the lossy edges to watch for.

schema-validation

schema-validation

JSON Schema for Beginners

A practical walkthrough of JSON Schema — types, required, constraints, refs, oneOf — with copy-pasteable examples and tool recommendations.

errors

errors

Comparing Two JSON Files: A Diff Guide

Why text-diffing JSON is unreliable and how to compute a structural diff — key-order independence, array identity, JSON Patch output.

errors

Common JSON Syntax Errors and How to Fix Them

The eight JSON syntax errors you actually hit in production — trailing commas, single quotes, BOMs, NDJSON — with concrete fixes for each.