Codeswap: Dev Tools & JSON

Codeswap is a developer toolbox that puts 755 offline dev tools in one fast app. Format JSON, test regex, encode Base64, generate hashes, convert colors, and 750+ more developer tools, all on your device with no sign-in and no internet connection.

Every tool runs locally, so your text, tokens, and config never leave your phone. That makes Codeswap safe for sensitive data and reliable on a plane, on a train, or behind a firewall, where web-based dev tools simply stop working.

WHAT'S INSIDE (755 tools, and counting)

- JSON tools: JSON formatter and validator, JSON viewer, minify, JSON to CSV, JSON to YAML, JSONPath query, and JSON diff.
- Code tools: formatters, converters, and generators for common languages, plus SQL, .gitignore, .editorconfig, and Dockerfile helpers.
- DevOps tools: YAML, .env file validator, cron expression builder, Dockerfile, Kubernetes, and nginx config snippets.
- Encoding: Base64 encode and decode, Base64URL, URL encode and decode, HTML entities, hex, and binary.
- Crypto and hashing: MD5, SHA-1, SHA-256, and SHA-512 hash generator, HMAC, CRC checksums, and a UUID generator.
- Regex: regex tester, regex builder, match extractor, replace tester, and a regex cheat sheet by language.
- Color tools: color converter (HEX, RGB, HSL), color palette generator, WCAG contrast checker, and CSS gradient builder.
- CSS tools: CSS formatter, minifier, and selector tester.
- Text tools: case converter, sort lines, remove duplicates, word and character count, slugify, and Lorem Ipsum generator.
- LLM and AI helpers: token counters, prompt utilities, and JSON tools for building and debugging AI apps.
- Date and time: Unix timestamp converter, cron parser, and date formatting.
- Markdown: live preview, convert to HTML, and clean up.
- Network: IP and CIDR tools, query string parser, and URL parser.
- JWT: JWT decoder, JWT builder, and JWT verifier for inspecting tokens offline.

WHY DEVELOPERS CHOOSE CODESWAP

- Offline first: every developer tool works with no connection. No accounts, no uploads, no tracking of what you type.
- Private by design: your input stays on device and is never sent to a server, which matters for API keys, tokens, and production config.
- Fast: open the app, search 755 tools, and get a result in seconds.
- All in one: stop bouncing between browser tabs and bookmarked websites. The dev tools you reach for every day live in one app.
- Built for developers: a clean, dark developer interface with instant search and favorites, so your go-to tools are one tap away.

WHO IT'S FOR

Codeswap is built for software developers, backend and frontend engineers, data engineers, QA testers, DevOps and SRE, computer science students, and anyone who works with JSON, code, and structured text every day.

COMMON USES

- Format and validate JSON offline, then minify or convert it to CSV or YAML.
- Test a regular expression and extract or replace matches with a live regex tester.
- Base64 encode or decode a string, or URL-encode a value for a link.
- Generate an MD5, SHA-256, or SHA-512 hash, or a random UUID.
- Decode a JWT to inspect its header and payload before shipping.
- Convert a HEX color to RGB or HSL and build a matching color palette.
- Convert text case, sort lines, remove duplicates, or slugify a title.
- Build and parse a cron expression, or convert a Unix timestamp to a date.
- Count tokens for an LLM prompt, or format and minify a block of CSS.

Codeswap is supported by ads. A one-time in-app purchase removes ads if you prefer a cleaner workspace. There is no sign-up and no subscription, and no account is ever required to use any tool.

Download Codeswap and carry 755 developer tools in your pocket, online or off.

Recent changes:
Codeswap brings 755 developer tools together in one offline app. Format and validate JSON, encode and decode Base64, generate hashes and UUIDs, build and test regex, convert HEX, RGB, and HSL colors, and work with YAML, JWT, cron, and timestamps. Everything runs on your device, so nothing leaves your phone. No sign-in and no connection required.