5 Free Browser Tools That Save Every Developer Hours

As developers, we spend an absurd amount of time on tiny, repetitive tasks. Formatting a string, testing a regular expression, or writing a fetch request from a cURL command.

Many tools exist online, but they often require sign-ups, show intrusive ads, or force you to upload your proprietary code to their servers. We built these 5 tools to be 100% free, completely private (running entirely in your browser), and lightning fast.

1. Regex Tester & Visualizer

Writing Regular Expressions is often described as a superpower, but debugging them is a nightmare. Our Regex Tester shows you live highlighting as you type. More importantly, it breaks down capture groups and execution time.

If your regex takes more than a few milliseconds, you might be introducing catastrophic backtracking into your app. Track it here before it crashes your production server.

2. cURL to Fetch / Axios Converter

You copy an API request from the documentation. It is a massive cURL command with headers and JSON payloads wrapped in quotes. Now you have to manually translate it into JavaScript.

Our cURL converter parses the command and instantly generates clean `fetch()` or `axios()` code. It automatically handles stringify-ing the JSON body and formatting the headers correctly.

3. UUID v7 & ULID Generator

If you are still using UUID v4 for your database primary keys, you are hurting your database performance. UUID v4 is completely random, which causes B-Tree index fragmentation.

UUID v7 and ULIDs are time-sortable. They start with a timestamp, meaning new records are always appended to the end of the index. Use our tool to generate batches of them securely using the Web Crypto API.

4. Unix Epoch Timestamp Converter

You are looking at a database record or a JWT token, and the date field says `1729998000`. What day is that? You could write a quick script, or you could use our Epoch Converter.

It automatically detects whether the timestamp is in seconds or milliseconds, converts it to local time, UTC, and ISO 8601, and even tells you how long ago it was.

5. AI Code Extractor

You ask ChatGPT to write a React component and a CSS file. It outputs them in one massive markdown response with two separate code blocks. You have to carefully copy each block into the right file.

Our Code Extractor scans the entire AI response, finds every fenced code block, and creates a downloadable file for each one. It even names the file with the correct extension (.tsx, .css, .py) automatically.