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Developer Cheat Sheets

Free, searchable quick references for 44 programming languages, frameworks, databases and developer tools. Each one groups the syntax and commands you look up most, with copy-ready examples and the versions it covers.

By Bogdan Sandu Updated

Showing all 44 cheat sheets

Notepad++ Cheat Sheet preview
Editors and Text Tools
Notepad++ Cheat SheetShortcuts, menu commands, column mode, macros, plugins, file comparison and regex search, filtered by skill level.
Angular Cheat Sheet preview
Web and Front-End
Angular Cheat Sheet526 snippets for signals, control flow, signal forms, routing, dependency injection, RxJS and the CLI.
ADB Commands Cheat Sheet preview
Mobile Development
ADB Commands Cheat SheetInstall ADB, connect devices over USB or Wi-Fi, install APKs, pull logs, control input and fix common errors.
VS Code Workflow Cheat Sheet preview
Editors and Text Tools
VS Code Workflow Cheat SheetKeyboard shortcuts by task for editing, navigation, search, terminal, Python, Git and debugging, with an OS toggle.

Programming Languages

15

Syntax, data types, collections, error handling and the standard library for 15 languages, from Python and JavaScript to Rust, Go and Lua.

Python Cheat SheetData types, strings, comprehensions, classes, file I/O, async/await and regular expressions in one searchable page.ComprehensionsClasses and OOPAsync / awaitUpdated JavaScript Cheat SheetVariables, functions, arrays, objects, promises, DOM manipulation and the ES6+ features you use daily.PromisesDOMES6+Updated TypeScript Cheat SheetTypes, interfaces, generics, utility types, narrowing, decorators and tsconfig options.GenericsUtility typesNarrowingUpdated Java Cheat SheetPrimitives, OOP, the Collections Framework, streams, lambdas, exceptions and file I/O with java.nio.CollectionsStreamsLambdasUpdated Kotlin Cheat SheetSyntax, functions, classes, collections, coroutines, scope functions and generics for Android and the JVM.CoroutinesScope functionsCollectionsUpdated Swift Cheat SheetOptionals, closures, protocols, generics, error handling, async/await, actors and SwiftUI for iOS work.OptionalsProtocolsasync / actorsUpdated C Programming Cheat SheetPointers, memory management, strings, structs, the preprocessor, printf formats, gcc flags and C23 changes.PointersDynamic memorygcc flagsC23Updated C++ Cheat SheetSyntax, pointers and memory, the STL, templates, concurrency and modern C++, with examples filtered by standard.STL containersTemplatesModern C++Updated C# Cheat SheetSyntax, pattern matching, records, LINQ, async, ASP.NET Core, EF Core and testing, with 358 snippets.LINQRecordsASP.NET CoreC# 14, .NET 10Updated Go Cheat SheetSlices, maps, structs, interfaces, generics, errors, goroutines, channels, net/http and testing.GoroutinesInterfacesGenericsGo 1.27Updated Rust Cheat SheetOwnership, borrowing, lifetimes, traits, iterators, error handling, smart pointers, async and cargo.OwnershipTraitsLifetimesUpdated Ruby Cheat SheetData types, strings, arrays, hashes, blocks, classes, modules and mixins, with version tags per snippet.BlocksHashesMixinsUpdated PHP Cheat Sheet592 snippets from syntax and arrays to OOP, PDO, requests, security and testing, filterable by version.ArraysOOPPDOUpdated R Cheat Sheet748 snippets across base R, dplyr, tidyr, ggplot2 and data.table, from data import to modelling.dplyrggplot2data.tableUpdated Lua Cheat SheetTables, strings, patterns, metatables, OOP, coroutines, modules, LuaJIT and Neovim configuration.TablesMetatablesCoroutinesLua 5.5Updated

Web and Front-End

5

Markup, styling, Tailwind and two major front-end frameworks. Useful when you build interfaces and keep forgetting a selector, a utility class or a hook signature.

HTML Cheat SheetDocument structure, text and list tags, forms and input types, semantic elements, media and meta tags.FormsSemantic tagsMeta tagsUpdated CSS Cheat SheetSelectors, the box model, units, flexbox, grid, transitions, animations and custom properties in 17 categories.FlexboxGridVariablesUpdated Tailwind CSS Cheat SheetUtility classes for layout, flexbox, grid, spacing, typography, colors and state variants.LayoutSpacingVariantsv3 and v4Updated React Cheat SheetJSX, props, state, built-in hooks, Context API, forms, routing and performance patterns.HooksContext APIRouterUpdated Angular Cheat Sheet526 snippets for signals, control flow, signal forms, routing, dependency injection, RxJS and the CLI.SignalsRoutingRxJSAngular 22Updated

Back-End Frameworks

3

Routing, ORM queries, validation, auth and CLI commands for three widely used back-end frameworks in Python, PHP and Java.

Django Cheat SheetModels, QuerySets, views, templates, forms, admin, auth, Django REST Framework, testing and deployment.ORM and QuerySetsAdminDRF5.2 LTS, 6.0, 6.1Updated Laravel Cheat SheetRouting, Eloquent, Blade, Livewire, validation, queues, Sanctum and Artisan, in 305 snippets.EloquentBladeArtisanLaravel 13Updated Spring Boot Cheat SheetProperties, profiles, REST controllers, validation, problem details, JPA, security, Actuator and testing.ConfigurationData JPAActuatorSpring Boot 4Updated

Databases and SQL

5

Standard SQL plus the client commands, data types and admin tasks of each major database engine, relational and document.

SQL Cheat SheetQueries, filters, joins, aggregates, window functions, CTEs, DDL, transactions and indexes, with dialect filters.JoinsWindow functionsCTEsUpdated MySQL Cheat SheetClient commands, data types, joins, indexes, EXPLAIN, users, backups and replication, plus a SQL formatter.IndexesEXPLAINReplication8.4 and 9.7Updated PostgreSQL Cheat Sheetpsql commands, queries, JSONB, indexes, EXPLAIN, VACUUM, roles, pg_dump and replication.psqlJSONBVACUUM14 to 18Updated SQLite Cheat Sheetsqlite3 shell commands, PRAGMAs, upserts, dates, JSON, FTS5, indexes and WAL mode, plus a SQL playground.PRAGMAsFTS5WAL3.37 to 3.53Updated MongoDB Cheat Sheetmongosh commands, query and update operators, aggregation pipelines, indexes, transactions and sharding.AggregationOperatorsIndexes7.0 to 9.0Updated

APIs and Data Formats

6

How data moves between services: REST and GraphQL conventions, every HTTP status code, and the JSON, YAML and XML formats your configs and payloads are written in.

REST API Cheat SheetMethods, URL design, status codes, errors, pagination, auth and JWT, CORS, versioning and OpenAPI 3.2.URL designPaginationOpenAPIUpdated GraphQL Cheat SheetQueries, variables, fragments, mutations, schema types, errors, pagination, DataLoader and security.QueriesSchema / SDLPaginationUpdated HTTP Status Codes Cheat SheetEvery code from 1xx to 5xx explained, which code to return, redirects, 429 and 5xx fixes, plus a response checker.4xx errorsRedirects5xx fixesUpdated JSON Cheat SheetSyntax, data types, parsing in JavaScript, Python, PHP, Java, C#, Go and more, jq, JSON Schema and a validator.jqJSON SchemaValidatorUpdated YAML Cheat SheetScalars, mappings, sequences, anchors and aliases, multi-line strings, common errors and YAML vs JSON.AnchorsMulti-line stringsCommon errorsUpdated XML Cheat SheetSyntax, escaping, namespaces, XPath, XSLT, XSD schemas and XXE security, plus an XPath tester and formatter.XPathXSLTXSDUpdated

DevOps and Command Line

4

Terminal, version control and containers: the commands you run every day in a shell, a repository or a cluster.

Bash Cheat SheetVariables, operators, control flow, functions, I/O, file and process commands, string operations and shortcuts.ScriptingProcess controlShortcutsUpdated Git Cheat SheetSetup, staging, committing, branching, merging and rebasing, remotes, stash, tags and undoing mistakes.BranchingRebasingUndoing changesUpdated Docker Cheat SheetContainer, image, volume and network commands, Dockerfile syntax, Compose, Swarm and security practices.ContainersDockerfileComposeUpdated Kubernetes Cheat Sheetkubectl commands for pods, deployments, services, ConfigMaps, secrets and volumes, plus YAML manifests and debugging.kubectlDeploymentsDebuggingUpdated

Mobile Development

2

Android debugging from the command line and a full checklist for getting an app approved on both stores. For the languages, see the Kotlin and Swift sheets.

ADB Commands Cheat SheetInstall ADB, connect devices over USB or Wi-Fi, install APKs, pull logs, control input and fix common errors.Device connectionlogcatAPK installUpdated App Store and Google Play Submission ChecklistAccounts, technical requirements, assets and metadata, privacy disclosures, age ratings, review times and rejection reasons.Store assetsPrivacy labelsRejectionsUpdated

Editors and Text Tools

4

Shortcuts and workflows for VS Code and Notepad++, plus regular expressions and Markdown, which you end up using in every editor.

VS Code Workflow Cheat SheetKeyboard shortcuts by task for editing, navigation, search, terminal, Python, Git and debugging, with an OS toggle.ShortcutsTerminalDebuggingUpdated Notepad++ Cheat SheetShortcuts, menu commands, column mode, macros, plugins, file comparison and regex search, filtered by skill level.ShortcutsColumn modeMacrosUpdated RegEx Cheat SheetAnchors, character classes, quantifiers, groups, lookarounds and flags, with common patterns and a live match tester.LookaroundsGroupsLive testerUpdated Markdown Cheat SheetBasic and extended syntax, tables, code blocks, links and images, escaping and flavor differences, with live preview.TablesCode blocksFlavorsUpdated

Learning paths

Not sure which sheet to open first? These sequences follow the order most developers pick up each stack, so every step builds on the one before it.

Front-end developer

From static markup to a typed, component-based app.

  1. HTML
  2. CSS
  3. JavaScript
  4. TypeScript
  5. React

Python back-end

A Python web API from the language basics to a containerized database app.

  1. Python
  2. Django
  3. PostgreSQL
  4. REST API
  5. Docker

PHP and Laravel

A common stack for PHP web apps, from the language to the database and version control.

  1. PHP
  2. Laravel
  3. MySQL
  4. Git

Mobile apps

Write the app, debug it on a device, then ship it to both stores.

  1. Kotlin
  2. Swift
  3. ADB Commands
  4. App Store and Google Play Submission

DevOps basics

The shell, version control and containers, in the order most teams adopt them.

  1. Bash
  2. Git
  3. YAML
  4. Docker
  5. Kubernetes

Free developer tools

Format, validate and convert data in the browser. Nothing to install, and your input is processed on the page.

JSON and Python

YAML

CSV and XML

Encoding and IDs

Step-by-step guides

When a one-line reference isn’t enough, these walkthroughs from the TMS blog cover the tasks our readers look up most often.

VS Code

Python environments

Notepad++

Git, GitHub and Docker

How to use these cheat sheets

Each sheet covers one language, framework or tool and is split into sections, so you can jump straight to strings, joins, routing or whatever you came for. Most sheets also have their own search box and filters, which narrow the page down to the version, SQL dialect or skill level you work with.

The sheets are references, not tutorials. They assume you know what you’re trying to do and just need the exact syntax, flag or command. For a fuller explanation, the step-by-step guides above go through common tasks one at a time.

  • Find a sheet fast. Press / anywhere on this page, type a name such as postgres, k8s or golang, then open the result.
  • Check the version. Cards list the versions a sheet covers where it matters, for example Angular 22 or MySQL 8.4 and 9.7.
  • Copy, don’t retype. Use the copy buttons inside each sheet to paste examples straight into your editor.
  • Bookmark this page. It’s the one index that links to every sheet and tool.

Frequently asked questions

Are these developer cheat sheets free?

Yes. All 44 cheat sheets and the 14 developer tools linked on this page are free, and you don’t need an account or an email address to read or use them.

What is a developer cheat sheet?

A developer cheat sheet is a condensed reference for one language, framework or tool. It groups the syntax, commands and patterns you need often but don’t always remember, so you can find them in seconds instead of searching the full documentation.

How up to date are the cheat sheets?

Every card on this page shows the date its cheat sheet was last updated, and many sheets state the versions they cover, such as Angular 22, Laravel 13, Spring Boot 4, Go 1.27 and PostgreSQL 14 to 18. Sort the list by “Recently updated” to see the newest ones first.

Can I copy the code examples?

Yes. Most sheets have a copy button next to each snippet, and many include search and filters inside the page, for example by version, SQL dialect or skill level.

Which cheat sheet should I start with?

If you are learning a stack, follow one of the learning paths on this page in order. If you already know what you need, press the / key, type a language, tool or command, and open the matching sheet.

Who writes and maintains these cheat sheets?

They are written and maintained by Bogdan Sandu and published by TMS Outsource, a custom software development company with engineering offices in Belgrade and Bucharest.

About the publisher

These cheat sheets are written and maintained by Bogdan Sandu and published by TMS Outsource, a custom software development company founded in 2014, with engineering offices in Belgrade and Bucharest. If you need a team to build or extend a web or mobile product, see our software development services or get in touch.

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Every week: one curated article, one tool worth knowing, one tip you can use tomorrow. No noise, no padding.