Developer tools

The everyday encode, decode and validate jobs, with nothing pasted going anywhere.

2 tools ready to use

JSON Formatter & ValidatorPretty-print, minify, validate and explore a JSON payload as a collapsible tree. Errors are pinned to a line and a column.Open toolFree · in-browser QR Code GeneratorLinks, Wi-Fi, contacts and more, drawn in your own tab and saved as PNG or SVG. Static codes, so nothing expires.Open toolFree · in-browser

This is the shelf where an upload form is genuinely dangerous. Formatting a JSON payload means pasting whatever was in it: a bearer token, a customer record, an API key. On a hosted formatter that is now on a server you have never heard of, in a log you cannot read.

Here it is a static page doing the parsing in your tab. Open the Network panel while you use one and you will see no request at all.

4 more in build

Named and designed, but not written yet. They are listed so you can see where this shelf is going. No dates, because a promised date on a free project is a broken one waiting to happen.

Base64 Encoder & DecoderText, files and data URIs, both directions, with UTF-8 handled properly.In build

Hash GeneratorSHA-1, SHA-256, SHA-384 and SHA-512 of text or a file, straight from the Web Crypto API.In build

UUID GeneratorCryptographically random v4 identifiers, one or ten thousand, generated locally.In build

Regex TesterMatch, highlight and explain a pattern against your own sample, with capture groups broken out.In build

Guides for these tools

How to fix a JSON syntax errorWhat the error message means in JavaScript, Python, PHP and Java, the eight mistakes behind nearly all of them, and how to find the character at fault.Do QR codes expire?A static code never expires and a dynamic one is a subscription. How to tell which you were given, why free codes stop working, and what to do when one already has.

This is one shelf of the full floi directory. The rest is media, text, developer, documents, education and design.