Developer
JWT Tokens: What's Inside and How to Decode Them
JWT tokens look like gibberish but they're just base64-encoded JSON. Here's how to read them and a free decoder tool.
Blog
Tips, guides, and tutorials for our free online tools.
Developer
UUID v4: Why It's the Default for Unique IDs
Need a unique ID that won't clash? UUID v4 is the standard. Here's how it works and a free tool to generate them in bulk.
Text
How to Remove Duplicate Lines from Any Text
Got a list with repeats? Here are three ways to strip duplicates — and a free tool that does it in one click.
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URL Slugs: How to Make Them SEO-Friendly
Bad slugs hurt SEO. Here's what makes a good URL slug, common mistakes to avoid, and a free tool to generate them.
Everyday
How to Count Days Between Two Dates (Without Losing Count)
Counting days between dates by hand is error-prone. Here's a better way — plus a free tool that handles leap years for you.