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snowkit Dev

Developer tools that keep your data local

JSON, SQL, encoding, regex, secrets and everyday developer utilities. All running in your browser, with nothing uploaded.

All tools

All-in-one appSnowkit DevJSON, SQL, regex and HTTP tools side by side, working on the same data.Open the app

Most used

JSON formatterFormat JSON with spaces or tabs, minify it, sort keys and browse it as a tree.Base64 encode and decodeEncode text to Base64 or decode it back, with full UTF-8, URL-safe Base64 and file to data URL conversion.Regex testerTest a JavaScript regular expression with every match highlighted, numbered and named groups, and a live replace preview.Diff checkerCompare two texts or files line by line, with changed words highlighted.JWT decoderDecode a JSON Web Token to read its header and claims, with exp, nbf and iat as dates, and check HS256 signatures.UUID generatorMake random version 4 or time-ordered version 7 UUIDs with secure random numbers, in bulk, and inspect any UUID.

All-in-one

Snowkit DevJSON, SQL, regex and HTTP tools side by side, working on the same data.Developer toolsJSON, Base64, hashes, JWT, regex and other daily helpers.

JSON and data

JSON formatterFormat JSON with spaces or tabs, minify it, sort keys and browse it as a tree.JSON validatorCheck whether JSON is valid and see the line, column and a plain explanation of any error, like a trailing comma.JSON to CSVTurn a JSON list of objects into CSV for Excel or Google Sheets.CSV to JSONConvert CSV or spreadsheet cells to JSON.JSON to YAMLConvert JSON to clean YAML with risky values quoted for you, or turn YAML with anchors and block text into JSON.JSON toolkitValidate JSON against a schema, test JSONPath queries and generate realistic mock data.JSONPath testerTest JSONPath expressions with filters, slices and recursive search against your own JSON and see matches live.Mock data generatorGenerate realistic fake records from a JSON Schema or a sample object: names, emails, dates, numbers in range and UUIDs, repeatable with a seed.CSV cleanerRemove duplicates and empty rows, trim spaces, split and merge columns and fix dates in a CSV.

Encode and decode

Base64 encode and decodeEncode text to Base64 or decode it back, with full UTF-8, URL-safe Base64 and file to data URL conversion.URL encode and decodePercent-encode a query value or a whole web address, or decode one back to text.JWT decoderDecode a JSON Web Token to read its header and claims, with exp, nbf and iat as dates, and check HS256 signatures.Text to binaryConvert text to binary, hex, octal or decimal codes and back, with full UTF-8 support.Binary to textPaste binary code such as 01101000 01101001 and read it as text.Image to Base64Turn images into Base64 data URLs for HTML and CSS, or decode Base64 back into an image.Base64 to imagePaste a Base64 string or data URL to see the image and download it as PNG, JPG, WebP, GIF or SVG.

Format and minify

Code formatterBeautify or minify HTML, CSS and JavaScript, with the size before and after.HTML formatterPaste messy or minified HTML and get it neatly indented, with inline scripts and styles formatted too.CSS minifierMinify CSS by removing comments, whitespace and unneeded semicolons, and see the size before and after.JavaScript minifierMinify JavaScript by removing comments and whitespace while keeping strings, regular expressions and template literals intact.

Generate

UUID generatorMake random version 4 or time-ordered version 7 UUIDs with secure random numbers, in bulk, and inspect any UUID.Password generatorMake strong passwords or easy-to-type passphrases with your browser's secure random numbers, and see the strength in bits.SHA-256 hash generatorGet the SHA-256 hash of any text or file, plus SHA-1, SHA-512 and MD5, and compare it with a published checksum..gitignore generatorCombine templates for your languages, frameworks, editors and OS into one tidy .gitignore.MD5 hash generatorGet the MD5 checksum of any text or file, with SHA-1, SHA-256 and SHA-512 alongside, and compare it with a published value.README generatorWrite a README or a changelog from a short form, ready as Markdown.Changelog generatorWrite a CHANGELOG.md in Keep a Changelog format from a short form or your commit messages, with compare links for each version.Env example generatorTurn a .env file into a .env.example with the values removed and the comments kept.Screenshot beautifierAdd a background, padding, rounded corners, a shadow, a browser frame and notes to a screenshot.Browser mockup generatorPut any screenshot in a clean browser window with your own address, add a background, padding and shadow, and save a PNG.

Test and convert

Regex testerTest a JavaScript regular expression with every match highlighted, numbered and named groups, and a live replace preview.Unix timestamp converterConvert a Unix timestamp to a date in any time zone, or a date to a timestamp.cURL converterTurn a cURL command into JavaScript fetch, Python requests, Go or PHP code.Format converterConvert between JSON, YAML, TOML, XML and .env in any direction, with line-numbered errors.Colour converterConvert HEX, RGB, HSL, HSV and OKLCH, build tints and shades, and check WCAG contrast.Contrast checkerCheck the contrast ratio between text and background colours against WCAG AA and AAA, see a live preview, and get the closest passing colour.

Inspect and protect

Secret scannerFind leaked API keys, tokens, private keys and passwords in code and logs, then redact them.Unicode inspectorReveal invisible characters, odd spaces and lookalike letters, with code points and bytes.Log viewerOpen big log files, filter by level, text or time, and jump between errors.

Compare

Diff checkerCompare two texts or files line by line, with changed words highlighted.

Databases and SQL

SQL playgroundQuery CSV, JSON and SQLite files with SQL, then export the results.SQLite viewerOpen SQLite database files in your browser, browse tables, run SQL and export results.Query CSV with SQLTurn CSV and JSON files into tables and query them with SQL in your browser.SQL formatterBeautify or minify SQL: joins, CTEs, subqueries, CASE, INSERT, UPDATE and CREATE TABLE.

Types and schemas

JSON to typesGenerate TypeScript, Zod, Go, Python and JSON Schema types from JSON.JSON schema generatorPaste JSON and get a JSON Schema instantly, with nested types and optional fields handled.

Schedules

Cron expressionsExplain and build cron schedules in plain English, with next run times.

Networks and permissions

Subnet calculatorIPv4 CIDR network, broadcast, host range, masks, binary view and splits, plus IPv6 prefixes.Chmod calculatorConvert Unix permissions between checkboxes, octal like 755 and rwxr-xr-x, with the chmod command.

Kits for Snowkit Dev

Agent Rules PackHouse rules, security and testing rules for coding agents, in the file formats each tool reads, plus a checklist for reviewing what they ship.Secure SkillsSecret scanning, dependency audits, CSP rollout and first-hour incident steps, with configs ready to copy into your repo.Developer ConfigCopy-in config for Node.js, TypeScript and Python repos: formatting, linting, git hooks, GitHub Actions CI, Dependabot and a dev container.Production Incident KitRunbook, severity levels, status page templates and a blameless postmortem so your team handles outages the same way every time.All kitsReady-made packs of files for builders.

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