Ship cleaner code faster: format, validate, encode, decode and generate with the utilities of everyday development work.
32 tools available
Format, validate and minify JSON in your browser with pinpoint error line + column, jump-to-error, key sorting and live editing: nothing is uploaded.
Validate JSON against RFC 8259 with the exact error line, column and a caret under the bad character. Get plain-English explanations, one-click auto-fix for trailing commas and single quotes, plus depth, key-count and type stats, nothing uploaded.
Explore JSON as an interactive, collapsible tree. Expand or collapse any branch, see type and array-length badges, search keys and values with live highlighting, and copy any node's value or its JSONPath in one click, all 100% in your browser.
Compare two JSON documents by structure, not text. Reordered keys and whitespace are ignored. You see added, removed and changed values by path with counts, all in your browser.
Convert JSON to TypeScript interfaces or types instantly, with merged unions across array items, optional-from-null, readonly, export and naming controls, 100% in your browser.
Beautify or minify XML in your browser with real well-formedness checking, preserved CDATA, comments, declaration and processing instructions, plus a precise error line: nothing is uploaded.
Format, clean and re-indent YAML in your browser, or convert YAML ↔ JSON, with key sorting, flow/block style and the exact error line + column. Nothing is uploaded.
Format, beautify and minify SQL in your browser with a dialect picker (PostgreSQL, MySQL, T-SQL, BigQuery, Snowflake…), keyword-case control and custom indentation: nothing is uploaded.
Beautify or minify HTML in your browser: reindent messy markup, wrap long lines, fix nesting readability, and collapse to production-ready output. Works on full pages and fragments. Nothing is uploaded.
Beautify and format CSS, SCSS and LESS in your browser with Prettier, auto-detected syntax, configurable indent and print width, nested-rule support and precise error lines. Nothing is uploaded.
Beautify and format JavaScript, TypeScript, JSX and TSX in your browser with Prettier, control semicolons, quotes, tab width, print width and trailing commas. Nothing is uploaded.
Minify HTML in your browser, collapse whitespace, strip comments and shrink page weight while safely preserving pre, textarea, script and style content. Nothing is uploaded.
Minify and compress CSS in your browser with csso. Merge duplicate rules, collapse shorthand and shorten colors, then see the exact bytes and percentage saved. Nothing is uploaded.
Minify and compress JavaScript in your browser with terser: mangle names, drop dead code and comments, keep class/function names when needed, and see the exact bytes saved. Nothing is uploaded.
Encode text or any file to Base64 instantly: Unicode-safe, with a URL-safe toggle and one-click data URLs. Runs entirely in your browser, nothing uploaded.
Decode Base64 back to text or a file instantly: Unicode-safe, auto-detects URL-safe input, sniffs binary data and offers a download. Runs fully in your browser, nothing uploaded.
Percent-encode text and URLs instantly: pick component mode for query values or full-URL mode to preserve structure, with a per-line batch switch. 100% in your browser, nothing uploaded.
Decode percent-encoded (URL-encoded) text back to plain, readable characters, and when you paste a full link, see it broken down into protocol, host, port, path, decoded query parameters and hash. 100% in-browser. Nothing is uploaded.
Decode and inspect any JSON Web Token instantly. Read the header, payload and signature, see when it was issued and expires, and optionally verify an HS256 signature. 100% in-browser. Your token never leaves your device.
Compute MD5, SHA-1, SHA-256, SHA-384 and SHA-512 checksums of any text or file at once, generate HMAC signatures with your own key, and verify a download against its expected hash, all in your browser, nothing uploaded.
Generate secure UUIDs instantly, random v4, time-ordered v7, or the nil UUID. Bulk-generate up to 1,000, copy or export as TXT/CSV, all in your browser.
Generate secure, URL-safe Nano IDs in your browser with a live size slider, alphabet presets, a custom alphabet, bulk output up to 1,000 and a real-time collision-odds estimate. Nothing is uploaded.
Generate strong, crypto-secure passwords and memorable passphrases in your browser: control length, character sets, look-alikes and guaranteed classes, with a live entropy meter. Nothing is uploaded.
Build and debug regular expressions with live match highlighting. Toggle the g/i/m/s/u/y flags, watch every match light up in your test string, inspect numbered and named capture groups, preview a find-and-replace, and drop in ready-made patterns from a built-in library. 100% in-browser. Nothing is uploaded.
Build and decode cron expressions visually. Pick presets or per-field rules, read a plain-English description, and preview the next 5 run times. Paste an expression to reverse it back. Runs entirely in your browser.
Convert Unix timestamps to human dates and back, with a live-ticking epoch clock, auto seconds/milliseconds detection, and ISO 8601, UTC, local and relative time, all in your browser.
Write GitHub-Flavoured Markdown and see a live, sanitised HTML preview side-by-side, with a formatting toolbar, tables, task lists, and copy-as-HTML. Nothing is uploaded.
Compare two texts side by side and highlight every added, removed and changed line, word or character, with unified or split view, ignore-whitespace and ignore-case, all in your browser.
Generate scannable 1D barcodes (CODE128, EAN-13, UPC-A, CODE39, ITF-14, MSI, pharmacode and Codabar) live in your browser, with per-format validation and PNG or SVG export. Nothing is uploaded.
Paste code, a.env file or logs and instantly flag exposed API keys, tokens, passwords and private keys, with a redacted copy to share. Private, in your browser.
Count tokens and estimate the cost of a prompt across GPT-4o, Claude and Gemini, exact for OpenAI, live, and entirely in your browser. No sign-up.
Paste example strings and get a regular expression that matches them. No regex knowledge needed. Validated against your examples, private, in your browser.
Whether you're debugging an API response, wiring up a webhook or reverse-engineering a payload, these tools give you an instant, distraction-free workspace. Paste in, transform, copy out, then get back to the code that actually matters.
Tutorials and tips for getting more from our developer studio.
developer-toolsOne pasted.env file or rushed commit is all it takes to leak a live API key. The steps secrets end up in code, how to scan for them in seconds, and the habits that stop it happening again.
developer-toolsOur regex generator turns example strings into a working pattern with zero AI, and that's a feature, not a shortcut. A look under the hood, and an honest case for boring algorithms.
developer-toolsTurn any API JSON response into accurate TypeScript interfaces. How inference works, handling nulls and arrays, and a fast in-browser JSON-to-TypeScript converter.
developer-toolsA practical regular-expression reference, the core syntax, ready-to-use patterns for email, URLs, phone numbers and dates, plus how to test regex safely.
developer-toolsWhat Base64 actually does, why it exists, how the encoding works, and the right times to use it, including data URIs, email attachments and embedding files.
developer-toolsUnderstand URL percent-encoding, which characters need escaping, why spaces become %20, and the crucial difference between encoding a component and a full URL.
Free, private and instant: everything runs in your browser.
