Terms starting with "J"
JavaScript Proxy Object
ES2015
Proxy wraps an object to intercept fundamental operations like property access, assignment, and function calls via trap handlers.
3w ago
javascript advanced
JIT Compiler Introduction (PHP 8.0)
PHP 8.0+
PHP 8.0's JIT (Just-In-Time) compiler compiles hot bytecode to native machine code at runtime — significant gains for CPU-bound tasks, minimal gains for typical web requests.
2mo ago
php advanced
json_validate() — Native JSON Validation (PHP 8.3)
PHP 8.3+
PHP 8.3 added json_validate() — a dedicated function that checks whether a string is valid JSON without decoding it, making validation faster and cheaper than json_decode() + error checking.
2mo ago
php beginner
JavaScript Bundling — Vite, Webpack, esbuild
ES2015
Bundlers combine JS modules into optimised files served by PHP — Vite for dev speed, Webpack for complex pipelines, esbuild for raw performance.
3mo ago
javascript intermediate
JSON.parse & JSON.stringify
ES5
JSON.stringify converts JS objects to JSON strings; JSON.parse converts them back — direct counterpart to PHP's json_encode/json_decode.
3mo ago
javascript beginner
JavaScript Module Patterns
ES2015
The evolution of JS modules — IIFE (pre-modules), CommonJS (Node.js require/exports), AMD (browser async), UMD (universal), and ESM (native import/export, the standard).
3mo ago
javascript intermediate
JavaScript Closures
ES5 A function that retains access to its enclosing scope's variables even after the outer function has returned — the foundation of data privacy in JS.
3mo ago
javascript intermediate
JavaScript Error Types & Custom Errors
ES5
JavaScript has built-in error types (TypeError, RangeError, SyntaxError) and supports custom error classes — enabling typed error handling and meaningful error hierarchies.
3mo ago
javascript intermediate
JavaScript Event Loop
ES5
1
The mechanism that lets JavaScript execute non-blocking I/O despite being single-threaded — call stack, microtask queue, and macrotask queue.
3mo ago
javascript intermediate
JavaScript Generators
ES2015
1
Functions that can pause execution and yield values on demand — enabling lazy sequences, infinite iterables, and cooperative async control flow.
3mo ago
javascript advanced
JIT Compilation
PHP 8.0+
5
Just-in-Time compilation converts hot bytecode paths to native machine code at runtime — trading startup time for faster execution of frequently run code.
3mo ago
compiler advanced
JIT Compiler (PHP 8.0)
PHP 8.0+
PHP's Just-In-Time compiler translates hot bytecode to native machine code at runtime, speeding CPU-bound workloads significantly.
3mo ago
php advanced
JSON Columns in MySQL & PostgreSQL
PHP 5.0+ Native JSON column types allow storing and querying semi-structured data within a relational database — without sacrificing ACID guarantees or the ability to index specific JSON paths.
3mo ago
database intermediate
json_decode()
PHP 7.3+
Parses a JSON string into a PHP value — a safe alternative to unserialize() for structured data exchange.
3mo ago
php beginner
JWT Algorithm Confusion (alg:none & RS→HS)
PHP 5.0+
Forging JWTs by exploiting libraries that accept alg:none or by switching an RS256 public key into HMAC-SHA256 signing.
CWE-327 OWASP A2:2021
3mo ago
security intermediate
9.1
JWT Deep Dive
PHP 7.0+
JSON Web Tokens carry signed (or encrypted) claims — three Base64url-encoded sections: header.payload.signature. Security depends entirely on algorithm choice and verification correctness.
3mo ago
cryptography advanced
JWT Vulnerabilities
PHP 7.0+ Misimplemented JSON Web Token handling allows attackers to forge tokens, bypass authentication, or escalate privileges.
CWE-287 OWASP A2:2021
3mo ago
security intermediate
8.8