Developer Tools for Windows: JSON, Base64, Regex

What you can do in the Dev Toolbox

JSON formatterIndent, minify, sort keys and validate JSON, with the reason it fails. Base64 decodeTurn Base64 back into readable text, or encode text, URL-safe if needed. URL encode and decodePercent-encode text for links and query strings, or decode %20s back. HTML entitiesEscape & < > " ' for safe HTML, or turn   and © back into text. SHA-256 hash generatorSHA-256, SHA-1, SHA-384 and SHA-512 of any text, updated as you type. UUID generatorRandom version 4 UUIDs (GUIDs), 1 to 1,000 at a time, with or without hyphens. JWT decoderRead a JSON Web Token's header and claims, with iat, nbf and exp as dates. Regex testerTry a JavaScript regular expression and see every match and capture group. Unix timestamp converterEpoch seconds or milliseconds to a readable date, and a date back to Unix time. Number base converterBinary, octal, decimal and hex side by side: type in any one, read the others. HEX to RGBColor codes in HEX, RGB and HSL, with the contrast ratio on white and black. QR code generatorStatic QR codes for links or text, in your colors, saved as PNG or SVG. Password generatorRandom passwords from 4 to 256 characters, up to 100 at once, with entropy shown. JSON to CSVTurn a JSON array into CSV rows, with comma, semicolon or tab separators. CSV to JSONTurn CSV rows into a JSON array of objects, keyed by the header row. Barcode generatorEAN-13, UPC-A, ISBN, Code 128, Code 39 and more, with check digits, as PNG or SVG. Color palette generatorPalettes from a color's harmonies, random with locks, or the main colors of a picture.

The tools

JSON formatter and validator, and JSON to CSV and back.
Base64, URL and HTML entity encoding and decoding.
JWT decoder, regex tester, Unix timestamp converter.
SHA hashes, UUIDs, passwords.
Binary, octal, decimal and hex, color codes, QR codes.
Barcodes (EAN, UPC, ISBN, Code 128 and more) and color palettes from a color or a picture.

Why offline matters here

Developer tool sites are where secrets leak: a production JWT pasted into a decoder, a customer export into a JSON formatter, an API key into a Base64 page. Each Dev Toolbox tool runs in the app on your own computer, with no server behind it, and works without a connection.

Questions, answered

Does anything I paste get sent anywhere?

No. The tools run on your computer and make no network requests.

Are YAML, SQL formatting, minifying and cron coming?

Yes, they are on their way.

Does the JWT decoder check signatures?

No, it decodes the header and claims and shows the dates; it does not verify the signature.

Can I use it on a locked-down work PC?

Octoolo installs for your own Windows account without administrator rights. Check your company's rules first.

Apps

Language

Dev Toolbox: the little tools, offline

What you can do in the Dev Toolbox

The tools

Why offline matters here

Questions, answered

The Dev Toolbox, and 16 more apps.