Frequently Asked Questions

CodeMash is a free suite of 25+ online developer tools including a JSON formatter, XML to JSON converter, Base64 encoder/decoder, JWT decoder, SQL formatter, CSV converter, hash generator, diff checker, and more. All tools run in your browser for maximum speed and privacy.

No. All tools work without sign-up, registration, or login. Just open any tool and start using it right away — completely free.

Yes! All 25+ tools are completely free with no usage limits, no premium tiers, and no hidden fees. We sustain the site through non-intrusive advertising.

CodeMash processes everything in your browser (client-side JavaScript). Unlike most alternatives, your data is never sent to any server. This means faster results, complete privacy, and no file size restrictions imposed by server upload limits.

Absolutely. All tools (except Pug compilation) run entirely in your browser — your data never leaves your device. For Pug tools that require server-side processing, data is processed in memory and immediately discarded. We never store, log, or share your data.

We use minimal analytics (Google Analytics) to understand which tools are popular. We do not use tracking cookies for advertising purposes. You can opt out at any time.

Yes. JWT decoding, Base64 encoding, hashing, and all other processing happens entirely in your browser. Nothing is sent to our servers. That said, we always recommend caution with production secrets.

We support XML ↔ JSON, YAML ↔ JSON, JSON ↔ CSV, HTML ↔ Pug (Jade), HTML ↔ Markdown, JSON → ION, JSON → JSON Schema, JSON → TypeScript interfaces, JSON → Go structs, and Text → JSON. We are constantly adding new converters.

Open the JSON to CSV converter, paste your JSON array of objects, and click Convert. The tool automatically detects column headers from object keys and generates properly formatted CSV output that works in Excel and Google Sheets.

Use our JSON to TypeScript converter. Paste a sample JSON response (e.g., from an API) and the tool generates TypeScript interfaces with proper types, including nested objects and arrays.

Yes. Our YAML to JSON converter supports all YAML 1.2 features including anchors, aliases, and multi-document files. It handles complex Kubernetes, Docker Compose, and CI/CD configuration files.

We support formatting for JSON, XML, HTML, CSS, JavaScript, and SQL. Each formatter offers customizable indentation (2 or 4 spaces) and both beautify and minify modes.

Yes. Our JSON formatter simultaneously validates your JSON syntax. If your JSON is invalid, it provides clear error messages to help you fix issues. It works as both a JSON beautifier and JSON validator.

Our SQL formatter supports standard SQL, MySQL, PostgreSQL, SQL Server, Oracle, MariaDB, and SQLite. It automatically uppercases keywords (SELECT, FROM, WHERE) for readability.

Open the Base64 tool, paste your Base64-encoded string, and click Decode. The tool instantly converts it to readable text. Encoding works the same way in reverse. Full UTF-8 and Unicode support.

Our hash generator computes SHA-256, SHA-1, and SHA-512 hashes simultaneously from any text input. It uses the Web Crypto API built into your browser for maximum security.

Yes. Our number base converter handles decimal, hexadecimal (hex), binary, and octal. Use prefixes: 0x for hex, 0b for binary, 0o for octal. Supports arbitrarily large numbers.

There is no hard limit since processing happens in your browser. Performance depends on your device, but most tools handle inputs of 1MB+ without issues.

Yes! Press Ctrl+Enter (Cmd+Enter on Mac) to convert/format. The code editors support standard editing shortcuts like Ctrl+A, Ctrl+Z, Ctrl+C/V, and more.

Client-side tools work after the initial page load, even with a spotty connection. Full offline support via PWA is on our roadmap.

We are working on public API access. Contact us if you are interested in integrating CodeMash tools into your workflow.

We are working on embeddable widgets. Contact us if you are interested in early access.