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Testing an API endpoint usually means firing up Postman, writing a curl command, or switching to a terminal. DevDeck's API Request Builder lets you do it all in one tab — pick a me…
Read Guide →Migrating a project from plain CSS to Tailwind CSS or converting a CSS snippet for use in a React co…
Read Guide →Raw JSON from APIs is often a single unreadable line. JSON Viewer formats it instantly, validates th…
Read Guide →Popular Guides
JSON Viewer & Formatter
JWT Toolkit
Base64 Text Encoder & Decoder
Regex Tester
UUID Generator
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JWT Toolkit is a complete JWT workbench. Decode any token to inspect its claims, and generate cryptographically signed J…
Read Guide →Base64 text encoding converts any string into a safe ASCII representation. It's widely used in HTTP Basic Auth headers, …
Read Guide →Base64 image conversion lets you embed images directly into HTML, CSS, or JavaScript as text strings. No separate file r…
Read Guide →Cryptographic hashes are one-way fingerprints of data. Use them to verify file integrity, store passwords safely, genera…
Read Guide →Weak passwords are the leading cause of account breaches. Password Generator creates cryptographically random passwords …
Read Guide →UUIDs are the standard way to generate unique identifiers without a central authority. DevDeck's UUID Generator has two …
Read Guide →Regular expressions are powerful but notoriously hard to write and debug. DevDeck's Regex Tester has two modes: a live T…
Read Guide →Unix timestamps are the number of seconds (or milliseconds) since January 1, 1970 UTC. They appear in logs, databases, a…
Read Guide →Computers think in binary. Programmers read hex. Humans use decimal. Number Base Converter instantly translates between …
Read Guide →CSV is the universal format for spreadsheet exports and database dumps, but modern APIs and apps expect JSON. Convert CS…
Read Guide →YAML is the language of configuration files — Kubernetes, Docker Compose, GitHub Actions, Ansible all use it. But APIs s…
Read Guide →Spotting differences between two versions of text — code, JSON, config files, or documents — is tedious without the righ…
Read Guide →Different coding conventions demand different text cases: API fields use camelCase, Python uses snake_case, CSS uses keb…
Read Guide →Whether you're writing a tweet (280 chars), a cover letter (400 words), or a blog post (800 words), knowing your word an…
Read Guide →Lorem ipsum is the industry-standard placeholder text used in design mockups, wireframes, and prototypes. Generate exact…
Read Guide →QR codes bridge the physical and digital world. Generate a QR code for any URL, contact, WiFi credentials, or text — ins…
Read Guide →Long URLs are awkward in messages, tweets, and printed materials. URL Shortener converts any URL into a short, shareable…
Read Guide →A URL contains protocol, domain, path, query parameters, and fragments — each with its own rules. URL Validator breaks a…
Read Guide →Resizing images for different contexts — web thumbnails, social media posts, email banners — usually requires Photoshop …
Read Guide →Color codes come in multiple formats depending on the context — CSS uses HEX or RGB, design tools use HSL, and APIs may …
Read Guide →Aspect ratio describes the proportional relationship between width and height. Whether you're designing for video, web l…
Read Guide →Smart Formatter is a universal data formatter that detects what you've pasted and formats it correctly — without you hav…
Read Guide →Copying HTML into a React component always requires manual cleanup — class becomes className, for becomes htmlFor, oncli…
Read Guide →Encoder / Decoder is a multi-format encoding tool that covers every encoding scheme developers regularly encounter — Bas…
Read Guide →Command Playground is DevDeck's smart routing layer. Paste any data — a JSON blob, a JWT token, a URL, a UUID, a Base64 …
Read Guide →Cron expressions power scheduled jobs on Linux servers, cloud functions, CI pipelines, and almost every backend system. …
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