OneCompiler：複数の言語に対応したコンパイラ
If you are new to a certain coding language, or continuously switching between various, this site has more than 45 compilers for you to test small or big codes.From the traditional Java, C, C++, C#, Python to the more exotic Elixir, Erlang or old Cobol souvenirs.It does also the web languages so as 9 databases queries interaction. It that later case, having defined a database sample to reuse will be a must for complex queries development.
AIコードジェネレーター
Describe by words what you want to achieve by code, select your language, and this tool will generate a code proposal for you, so as an application example (depends on the language chosen). Many real coding languages to chose from, although if you invent a language name, it will return a basic-like code. This kind of AI coding tools have been popularized by big AI names, but very few still give free access and do not ask for registration. So kudos! Edit: plethora of similar tools now, in a very fast evolving market.
JSONバリデーター
Validates your JSON code, highlights potential errors or typos and formats it for a nice comprehensive view: JSONLint is a specialized validator and reformatter for JavaScript Object Notation (JSON) that ensures data structures comply with standard parsing rules. The tool identifies syntax errors—such as misplaced commas, unquoted keys, or mismatched delimiters—and provides line-specific error reporting to facilitate rapid debugging. Additionally, it functions as a code beautifier, transforming minified or obfuscated strings into a human-readable format with standardized indentation. Users can validate data through direct input, fetch JSON from remote URLs, or use the service to minify code for optimized storage and transmission.Simple and effective.Engineering and quality assurance professionals apply this tool […]
16進数とASCIIチェックサム計算機
The most complete online checksum calculator for HEX numbers or ASCII strings we have encountered. It will return in 1 go: CheckSum8 Xor CheckSum8 Modulo 256 (Sum of Bytes % 256) CheckSum8 2s Complement (0x100 – Sum Of Bytes) CRC-16 (MODBUS) CRC-16-CCITT, CRC-CCITT (X.25, V.41, HDLC, XMODEM, Bluetooth, SD …) CRC-16-IBM, CRC-16-ANSI (Bisync, Modbus, USB, ANSI X3.28 …) CRC-16-T10-DIF (SCSI DIF) CRC-16-DNP (DNP, IEC 870, ModBus) CRC-16-DECT (Cordless Telephones) CRC-32 (ISO 3309, ANSI X3.66, FIPS PUB 71, FED-STD-1003, ITU-T V.42, Ethernet, SATA, MPEG-2, Gzip, PKZIP, POSIX cksum, PNG, ZMODEM) CRC-32C Castagnoli (iSCSI, SCTP, G.hn payload, SSE4.2) CRC-32K (Koopman) CRC-32Q (aviation, AIXM) With most of the time, both the Big Endian […]
16進数変換ツール
It splits any even super long HEXADECIMAL in chunks and in one go will return the its Binary, FLOAT, UINT32, INT32, UINT16 and INT16 encoding corresponding to the RAW chunk part. Very clear and fast to use.
CSSとJavaScriptのスニペットリポジトリ
10.000+ free code snippets in CSS, HTML, Javascripts, Bootstrap, Tailwind, jQuery, React or Vue. A not-so-nice but efficient search engine between all this resources leads directly to a demo for fast decision and most of the time a link to a live demo + its code on CodePen.
cURLコンバーター
Convert any cURL command into various coding languages, such as PHP, Python, Javascript, C, C#, Perl, Java … Curlconverter.com is an open-source utility that automates the translation of cURL commands and HTTP Archive (HAR) files into executable source code for various programming languages, including Python, JavaScript, Go, Rust, and MATLAB.The platform parses complex request parameters—such as headers, cookies, authentication credentials, and JSON payloads—to generate syntactically accurate code snippets using standard libraries like Requests, Axios, or native fetch. By facilitating the transition between command-line network interactions and programmatic implementation, the service reduces manual coding overhead and minimizes errors during the integration of web-based services into software architectures.For a quick intro into […]
D3データビジュアライゼーションギャラリー
One of the must-have tool to represent any dataset in a graphical or interactive manner. This superb classified gallery of examples of many graphs, charts and diagrams demonstrates what can be made with the free D3 javascript framework. Tip: click on the small top “D3” title to see even more examples, more than 500, but unclassified. Usage experience: we use the D3 library on this website extensively. This is without any doubt one of the best library to convert data into nice and clear visualisation. One aspect to have in mind tough: it has been expanded and expended over the 10 last years for more possibilities, features browser compatibility, javascript […]
オンラインJavaScriptミニファイ
Minify your javascript code online. Gain resources and speed.Many parameters to chose from, with a live example to see how they influence the results.Comments can be taken outunnecessary code is taken outvariable names are shorten …The DigitalOcean Minify tool is a technical utility designed to optimize web assets by stripping non-functional characters from JavaScript, CSS, and HTML files. It removes whitespace, line breaks, and code comments to minimize file size while preserving the execution logic of the source code. The service facilitates:Direct text entry for immediate code processingFile uploads for local asset optimizationURL fetching to minify live web resourcesReal-time analytics to quantify data reductionEngineering and scientific professionals utilize this tool […]
DeepLオンライン翻訳
Said by many to be the most accurate online automatic translation. Online, but also a windows app available. Update: used to be the only good cheap alternative online … you to judge nowadays.