Developer and data tools

Format JSON, encode and decode Base64 and URLs, generate hashes and UUIDs, decode JWTs and clean CSV. Everything runs locally in your browser.

  • Free
  • No sign-up
  • Runs in your browser

Popular searches

Ready-made pages for the most common conversions, calculations and formats.

Color converter

Hash generator

Base64 encode and decode

Strong password generator

UUID generator

URL encode and decode

All tools in this category

JSON formatter and validatorFormat, validate and repair JSON, with the exact line of any error. AI API cost calculatorEstimate the cost of an AI API from token prices and your usage, and compare two models. Base64 encode and decodeConvert text, files and images to and from Base64, in your browser. Color converterConvert colors between HEX, RGB, HSL, HSV, HWB, CMYK and OKLCH. CSV cleanerTrim spaces, remove empty and duplicate rows and change the separator of a CSV. CSV viewerOpen a CSV file as a table, search it and sort it, without Excel. JSON to CSV and CSV to JSONConvert JSON to CSV for a spreadsheet, or CSV to JSON for code. Regular expression testerTest a regular expression on your text, with live matches, groups and replace. Strong password generatorGenerate strong random passwords in your browser. Nothing is sent or stored. Cron expression generatorBuild a cron schedule and see what it means and when it will run next. CSS generatorsBuild box shadows, gradients, rounded corners and glass effects, and copy the CSS. CSV column selectorKeep only the columns you need, reorder and rename them. Hash generatorCalculate MD5 and SHA hashes of text or files, and verify a checksum. JSON diffCompare two JSON documents and see every difference with its path. JSON minifierCompress JSON by removing whitespace, and check that it is valid. JSON to YAML and YAML to JSONConvert configuration between JSON and YAML in one click. JWT decoderRead what is inside a JSON Web Token, and check whether it has expired. SQL formatterBeautify and indent SQL queries for a range of database dialects. Test data generatorGenerate fake names, emails, addresses and more as JSON, CSV or SQL. Token counterEstimate the tokens in a text, and see how much of a context window it uses. Unix timestamp converterConvert epoch timestamps to dates and dates to timestamps, in seconds or milliseconds. URL encode and decodePercent-encode text for a URL, or decode %20 and similar back into text. Convert a date to ISO 8601Turn dates in many formats into ISO 8601, and read ISO durations. ENV file validatorFind mistakes in a .env file and make a safe .env.example. HTTP status codesEvery HTTP status code with a clear meaning, searchable. JSON to tableSee JSON as a table and copy it as Markdown, CSV, HTML or spreadsheet cells. MIME type lookupFind the MIME type of a file extension, and the other way round. Random string generatorGenerate random strings, tokens and codes with the characters and length you choose. Stack trace cleanerCut an error log down to what matters and remove private data before sharing it. URL parserBreak an address into its parts and read its query parameters. UUID generatorGenerate UUIDs (v4 and v7) in bulk, in the format you need. XML formatter and validatorIndent, minify and check XML for well-formedness.

What you can do here

Developers reach for the same small utilities dozens of times a week: pretty-print a JSON response, decode a JWT, build a hash, check a regex or turn a CSV into JSON. These tools do those jobs instantly, without an install, an account or an ad-laden page, and without sending your data anywhere.

That last point matters more than it seems: pasting tokens, API responses and internal data into an online tool is a real leak risk when the site processes it on a server. Here, the processing happens in your browser, so you can use the tools with real data, though it is still wise to prefer test credentials.

  • Format and validate: JSON, XML, SQL and .env files, with clear error messages.
  • Encode and decode: Base64, URLs, HTML entities and JWTs.
  • Generate: hashes (MD5, SHA-256), UUIDs, passwords, random strings, cron expressions and test data.
  • Convert: JSON and CSV, JSON and YAML, timestamps, colours and MIME types.

Frequently asked questions

Are these tools safe for tokens and API data?
The data is processed in your browser and never sent to a server. Even so, prefer test credentials, and rotate a secret if you pasted it somewhere you do not fully trust.
Do I need to install anything?
No. Everything runs in the browser, and after the first visit most tools keep working offline.
Are the generators cryptographically secure?
Passwords, UUIDs and random strings use the browser's secure random generator, not Math.random.
Can I use the output in production?
Yes. The tools use standard formats and algorithms, but always test the result in your own environment.
Is there an API?
No. UtilsDock is a set of browser tools; nothing is processed on a server, so there is no API.