Developer Glossary

Plain-English definitions of developer terms. No jargon, no fluff—just the stuff you actually need to know.

A

API (Application Programming Interface)

The contract that lets your code talk to someone else's code.

JSON FormatterURL EncoderJWT Decoder

B

Base64

A way to stuff binary data into a text string without breaking things.

Base64 Encoder/DecoderImage to Base64JWT Decoder

C

CORS (Cross-Origin Resource Sharing)

The browser's bouncer that decides which domains can talk to each other.

URL EncoderJSON FormatterBase64 Encoder

Cron (Cron Expression)

Five cryptic fields that tell servers when to do things—runs at 2am every Sunday? Easy.

Cron BuilderTimestamp ConverterDate Calculator

CSV (Comma-Separated Values)

Spreadsheets as text files, with commas doing all the heavy lifting.

CSV to JSONJSON to CSVCSV Escape/Unescape

H

Hash (Cryptographic Hash)

A one-way fingerprint for data—same input always gives same output, but you can't reverse it.

Hash GeneratorPassword GeneratorUUID Generator

HTTP Status Codes

Numbers that tell you if your request worked, failed, or went somewhere else.

JSON FormatterURL EncodercURL Converter

J

JSON (JavaScript Object Notation)

The universal language for sending data between systems.

JSON FormatterJSON ValidatorJSON to YAML

JWT (JSON Web Token)

A signed token that proves who you are without a database lookup.

JWT DecoderBase64 EncoderJSON Formatter

M

Markdown

Plain text formatting that converts to HTML without the angle bracket headaches.

HTML to MarkdownMarkdown to HTMLMarkdown Table Generator

N

Nginx (Engine-X)

The web server that handles your traffic, proxies your apps, and terminates your SSL—all in one config file.

Nginx Formatter.htaccess GeneratorYAML Validator

O

OAuth (Open Authorization)

The "Login with Google" button that lets apps access your stuff without your password.

JWT DecoderBase64 EncoderURL Encoder

R

Regex (Regular Expression)

A mini-language for finding patterns in text—powerful but cryptic.

Regex TesterText ExtractorRegex Escape

REST API (Representational State Transfer)

The most common way to build web APIs - use HTTP verbs on URLs to manage resources.

JSON FormatterURL EncodercURL Converter

S

SQL (Structured Query Language)

The language your database actually understands—CRUD operations with extra steps.

SQL FormatterJSON FormatterCSV to JSON

T

TOML (Tom's Obvious Minimal Language)

Config files that are actually obvious—INI files evolved for the modern age.

TOML to JSONJSON to TOMLYAML Validator

U

Unix Timestamp

Time as a single number—seconds since 1970. Simple, universal, timezone-free.

Timestamp ConverterDate CalculatorCron Builder

URL Encoding (Percent Encoding)

Turning spaces into %20 so URLs don't break.

URL Encoder/DecoderUTM BuilderURL Slug Generator

UTF-8 Encoding

The encoding that lets you use emojis, Chinese characters, and plain ASCII in the same file.

UTF-8 Encoder/DecoderUnicode Escape DecoderBase64 Encoder

UUID (Universally Unique Identifier)

A random ID that won't collide with anyone else's, ever.

UUID GeneratorHash Generator

X

XML (eXtensible Markup Language)

HTML's stricter cousin, used for config files and enterprise software.

XML FormatterXML ValidatorXML to JSON

Y

YAML (YAML Ain't Markup Language)

Config files that look like plain English—until the whitespace bites you.

YAML ValidatorJSON FormatterJSON to YAML