How to Convert JSON to a TypeScript Interface (3 Ways)
You hit an API, get back a blob of JSON, and now TypeScript is red-underlining every property because it has no idea…
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Developer Tools
Free Online Developer Tools
Format JSON, compress CSS, generate placeholder text, hash strings, and convert timestamps. No signup, no install, no upload to a server.
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Free online developer tools that run in your browser
Pixellize collects the utilities developers reach for every day: format and validate JSON, XML, SQL, and HTML, minify CSS and JS, generate hashes, UUIDs, and mock data, encode and decode Base64 or URLs, test regex, convert between JSON, CSV, YAML, and TypeScript, and build CSS gradients, grids, and shadows. Every tool is free, needs no account, and runs instantly.
The tools run right in your browser, so your code, tokens, and data stay on your device and are never sent to a server. That keeps snippets and secrets private, and it means each tool responds the moment you paste your input.
What you can do
- Format and validate: JSON, XML, SQL, HTML, and Markdown, with tree views and error checks.
- Convert: JSON to CSV, YAML, or TypeScript, CSV to JSON, and number bases or timestamps.
- Generate: hashes, UUIDs, mock data, barcodes, cron expressions, and CSS grid, gradient, and shadow code.
- Encode and inspect: Base64, URL encoding, JWT decoding, regex testing, and diff checking.
Pick a tool below, paste your input, and get the result. It works the same on desktop, tablet, and phone.
FAQ
Developer Tools FAQ
Quick answers about using the free developer tools on Pixellize.
Are the developer tools free to use?
Yes. Every developer tool on Pixellize is free, with no account and no limit on how many times you use it. Open a tool and start right away.
Is my code or data sent to a server?
No. The developer tools run in your browser, so your code, tokens, and data stay on your device and are never uploaded. That keeps snippets and secrets private.
Do I need to install anything or sign up?
No. Everything works in a normal web browser on desktop, tablet, or phone. There is nothing to download and no sign up, just paste your input and go.
Can I use these tools for commercial projects?
Yes. You can use the tools and anything you generate with them for personal or commercial work at no cost, with no license fee and no attribution required.
Is it safe to decode a JWT or hash here?
Yes. Decoding and hashing happen locally in your browser, so the token or text you paste never leaves your device. Nothing is logged or stored.
Do the developer tools work on mobile?
Yes. They run in any modern mobile browser on Android and iPhone, so you can format JSON or test a regex from your phone with no app to install.
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