The developer lexique.

A local file commonly used to load environment variables during development.

Shorthand for an outsized multiplier — a developer, tool, or workflow that produces far more than the baseline.

3D Secure is a billing or payment concept that helps products charge customers and reconcile access safely.

A/B Test is a product or analytics concept that helps measure whether users find value and where the product leaks.

A contract that lets one program ask another program for data or actions.

API Contract is a documentation, architecture, or package-management concept that helps teams explain decisions, publish changes, and keep projects understandable.

A secret token used to authenticate calls to an API.

ARIA Label is a web interface concept that helps browsers structure, style, and adapt pages for users.

AWS is an infrastructure or cloud concept that helps software run reliably outside your laptop.

Acceptance Criteria is a testing or quality concept that helps prove code works before users or production depend on it.

Access Gate is a billing or payment concept that helps products charge customers and reconcile access safely.

Access Token is a security or privacy concept that helps protect users, permissions, secrets, and systems from abuse.

Designing and coding so people with different abilities can use the product.

Accessibility Test is a testing or quality concept that helps prove code works before users or production depend on it.

Accordion is an UI or product-design concept that helps screens communicate state, hierarchy, and user action clearly.

Account Takeover is a security or privacy concept that helps protect users, permissions, secrets, and systems from abuse.

Action Step is an AI-agent or model workflow concept that helps agents plan, call tools, manage context, and produce reliable outputs.

Activation is a product or analytics concept that helps measure whether users find value and where the product leaks.

Activation Event is a product or analytics concept that helps measure whether users find value and where the product leaks.

Actual Result is a testing or quality concept that helps prove code works before users or production depend on it.

Admin Route is a security or privacy concept that helps protect users, permissions, secrets, and systems from abuse.

An AI that takes actions autonomously to complete a goal over multiple steps.

The cleanup left after an AI agent changed a lot at once.

Agent Memory is an AI-agent or model workflow concept that helps agents plan, call tools, manage context, and produce reliable outputs.

Aggregation Query is a data or database concept that helps apps model, store, query, migrate, and protect information.

Alert is a delivery or reliability concept that helps teams ship changes, watch production, and recover quickly.

Text that describes an image for screen readers and fallback contexts.

Ambient Type is a TypeScript or language-tooling concept that helps code describe shapes, catch mistakes, and stay maintainable as it grows.

Anchor Tag is a web interface concept that helps browsers structure, style, and adapt pages for users.

App Router is a React or Next.js concept that helps build UI, route pages, and separate browser work from server work.

A checkpoint that requires a human, policy, or automated rule to approve an agent action before it runs.

Approval Review is a Git or collaboration concept that helps developers review, combine, and preserve code changes safely.

Architecture Decision Record is a documentation, architecture, or package-management concept that helps teams explain decisions, publish changes, and keep projects understandable.

Array is a core programming concept that helps code store values, make decisions, and run predictable steps.

Assertion is a testing or quality concept that helps prove code works before users or production depend on it.

Assistant Message is an AI-agent or model workflow concept that helps agents plan, call tools, manage context, and produce reliable outputs.

Async/Await is a core programming concept that helps code store values, make decisions, and run predictable steps.

Attack Surface is a security or privacy concept that helps protect users, permissions, secrets, and systems from abuse.

Attribution is a product or analytics concept that helps measure whether users find value and where the product leaks.

Auth Guard is a security or privacy concept that helps protect users, permissions, secrets, and systems from abuse.

Proving who a user is.

Deciding what an authenticated user or system is allowed to do.

Authorization Header is an API or networking concept that helps apps send requests, receive responses, and move data between systems.

Avatar is an UI or product-design concept that helps screens communicate state, hierarchy, and user action clearly.

Azure is an infrastructure or cloud concept that helps software run reliably outside your laptop.

The server-side part of an app that handles APIs, databases, secrets, auth, and business logic.

Background Job is an infrastructure or cloud concept that helps software run reliably outside your laptop.

Backup is a data or database concept that helps apps model, store, query, migrate, and protect information.

Backward Compatibility is a documentation, architecture, or package-management concept that helps teams explain decisions, publish changes, and keep projects understandable.

Base64 is a file, format, or localization concept that helps tools read files, exchange structured content, and support multiple languages.

High praise for a take or decision that's correct and refreshingly unafraid of being unpopular.

Bearer Token is an API or networking concept that helps apps send requests, receive responses, and move data between systems.

Spending disproportionate energy on a trivial, easy-to-argue detail while the hard, important decisions get ignored.

A customer page for managing payment methods, invoices, and subscription changes.

Blob Storage is an infrastructure or cloud concept that helps software run reliably outside your laptop.

Blue-Green Deployment is a delivery or reliability concept that helps teams ship changes, watch production, and recover quickly.

Boolean is a core programming concept that helps code store values, make decisions, and run predictable steps.

Border is a web interface concept that helps browsers structure, style, and adapt pages for users.

Bounce Rate is a product or analytics concept that helps measure whether users find value and where the product leaks.

Box Model is a web interface concept that helps browsers structure, style, and adapt pages for users.

A separate line of Git work used to build or test changes without disturbing the main version.

Branch Protection is a Git or collaboration concept that helps developers review, combine, and preserve code changes safely.

Breadcrumb is an UI or product-design concept that helps screens communicate state, hierarchy, and user action clearly.

Breaking Change is a documentation, architecture, or package-management concept that helps teams explain decisions, publish changes, and keep projects understandable.

Breakpoint is a web interface concept that helps browsers structure, style, and adapt pages for users.

The app that loads and runs websites, such as Chrome, Safari, or Firefox.

A mistake in software that causes incorrect or unexpected behavior.

The step that turns source code into optimized output ready to run or deploy.

Build Pipeline is a delivery or reliability concept that helps teams ship changes, watch production, and recover quickly.

Build Script is a documentation, architecture, or package-management concept that helps teams explain decisions, publish changes, and keep projects understandable.

Sharing your product's progress, metrics, and mistakes openly as you build it, usually on social media.

The plain decision of what a button should do before anyone styles it.

Button Element is a web interface concept that helps browsers structure, style, and adapt pages for users.

A global network that serves files or cached pages from locations near users.

Automation that checks, builds, tests, and sometimes deploys code after changes.

A command-line interface: software controlled by typed commands instead of buttons.

Browser rules that control which websites can read responses from another origin.

Create, Read, Update, Delete: the four basic operations most apps perform on data.

Cross-site request forgery: tricking a logged-in browser into submitting an unwanted request.

The styling language that controls layout, color, spacing, typography, and responsive behavior on the web.

CSS Grid is a web interface concept that helps browsers structure, style, and adapt pages for users.

CSS Variable is a web interface concept that helps browsers structure, style, and adapt pages for users.

CSV is a file, format, or localization concept that helps tools read files, exchange structured content, and support multiple languages.