The Developer Toolkit I Actually Use Every Day in 2026

If you do it twice, automate it

That's the engineering mantra. But sometimes automation is overkill. Sometimes you just need to format a messy JSON response, or quickly hash a password, or figure out why your cron job didn't run at 3 AM.

For years, I relied on random Google searches for these tasks. I'd click the first result, paste my data into some website I'd never heard of, and hope for the high-performing. Sometimes the site looked like it hadn't been updated since 2008. Sometimes it asked me to disable my ad blocker before I could use it. Once, I pasted a production API key into a tool and realized afterward that it was sending every input to a server I knew nothing about.

That scared me enough to do something about it.

Here are the five tools I use most often. They all run in the browser, they all process data locally, and they all save me time every day.

1. JSON Formatter

We've all been there. A 5MB API response comes back as a single line of text. You can't read it. You can't debug it. You can't find the field you're looking for.

The JSON Formatter is my first stop when I get a messy response.

It validates the JSON as it formats. If I missed a trailing comma in my config file, the tool tells me exactly where the error is. It also minifies JSON when I need the compact version for deployment.

The important part: it runs entirely in the browser. I can paste production user data here without worrying that it's being sent to a server somewhere. I've used it with data containing email addresses, phone numbers, and internal IDs. Nothing leaves my machine.

I use this tool at least once a day. Sometimes five times.

2. Cron Expression Generator

Quick: what does 0 5 * * 1 mean?

If you had to think about it, you need this tool.

Cron syntax is powerful but not intuitive. The five fields represent minute, hour, day of month, month, and day of week. Each field accepts numbers, ranges, lists, and wildcards. Getting it wrong means a backup runs every minute instead of every month, or a cleanup job never runs at all.

I used to dread setting up scheduled tasks. I'd open a cron reference page, stare at it for two minutes, type something, test it, get it wrong, and try again.

The Cron Generator lets me click through a visual interface. Every Monday at 5 AM. Every 15 minutes. The first day of every month. It generates the expression and explains what each field means in plain English. I copy, I paste, I move on.

I've also used it to decode existing cron expressions. Paste 0 5 * * 1 into the tool and it tells you "At 5:00 AM on Monday." No more guessing.

3. JSON to TypeScript Converter

This is the biggest time-saver on the list.

I work with external APIs that don't provide SDKs or type definitions. Manually typing out interface UserResponse { ... } for a nested object with fifty fields is painful and error-prone.

With the Type Converter, I paste the raw JSON on the left and get a perfect TypeScript interface on the right. It handles nested objects, arrays, nullable fields, and union types automatically.

It also generates Zod schemas for runtime validation. This matters because TypeScript types only exist at compile time. If your API sends malformed data, TypeScript won't catch it. Zod validates at runtime and throws a descriptive error instead of letting bad data propagate through your application.

I used to spend fifteen minutes typing interfaces for complex API responses. Now it takes ten seconds.

4. Hash Generator

When I'm testing authentication flows or verifying file integrity, I need hashes fast.

The Hash Generator produces MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly. I use it to verify that a downloaded binary matches the checksum provided by the vendor. I use it to quickly hash a string for testing. I use it to generate unique identifiers from input data.

The tool runs locally, so I can hash sensitive strings without sending them anywhere. That matters when you're testing with real passwords, API keys, or tokens.

5. Image Converter

Frontend developers know we should be serving WebP or AVIF images. But opening Photoshop to convert a single banner image is friction.

The Image Converter lets me drag and drop an image and get it in the format I need. PNG to WebP. JPEG to AVIF. SVG to PNG. It uses WebAssembly for processing, so it's fast and everything stays on my device.

I use it for optimizing hero images before deployment, converting logos to the right format for different contexts, and resizing screenshots for documentation.

The math of small time savings

Each of these tools saves me maybe three to five minutes per use. I use them a few times a day. That's fifteen to twenty minutes saved daily. Over a year, that's about ninety hours.

Ninety hours of my life back from tasks that a browser can handle in seconds.

Productivity isn't about working harder. It's about reducing friction. These tools remove the micro-annoyances from my day so I can spend my time on actual problems instead of formatting JSON and decoding cron expressions.

Build your own toolkit

The full collection is at Axonix Tools. Every tool runs in the browser. Every tool processes data locally. Every tool is free.

Bookmark the ones you use. You'll reach for them more often than you expect.