Merge JSON Files
It’s fast, free, and doesn’t require any sign-up. Just upload your files, and it merges them into one clean JSON output. I made this because I kept running into small but annoying JSON merging tasks while working on side projects — especially when dealing with API responses, config files, or datasets. Most existing tools were either CLI-only, full of ads, or had weird size limits. So I built my own.
Merge JSON Files launched on February 7, 2025 with 8 votes and more than 50% of that year's launches. The site was still online in September 2026, 1 year on.
What it does
Merge multiple JSON files instantly with our free online tool. No ads, no signup, secure, clean UI. Download merged JSON files in seconds with perfect structure.
Merge JSON files online instantly with our free JSON merger tool. Combine multiple JSON files into one, merge arrays and objects seamlessly. No signup required - uses browser-based processing for local browser processing.
Combine multiple JSON files into one valid result. Reorder files, control array and key conflicts, preview the output, and download it without uploading your data. Drop two or more .json files, or open them from your device. Files are validated and processed locally. // config_base.json { "app" : "MyApp" , "database" : { "host" : "localhost" , "port" : 5432 } , "features" : [ "auth" , "logging" ] } // config_prod.json { "database" : { "host" : "db.prod.com" , "ssl" : true } , "features" : [ "caching" ] , "replicas" : 3 } Output: Merged Result json Copy { "app" : "MyApp" , "database" : { "host" : "db.prod.com" , "port" : 5432 , "ssl" : true } , "features" : [ "auth" , "logging" , "caching" ]…from merge-json-files.com
Does a similar job
all alternatives →
JSON File Splitter Online2025 · merge-json-files.com · ▲9Split large JSON files online quickly and easily 100% free
JSONBason2025 · jsonbason.com · ▲15I've been at it again, just sharing my simple JSON data inspection tool, love webdev and single page apps, this one took 4 days and was a lot of fun. The code is not obfuscated so you can inspect it and see how it works (very simple, server side is even more simple) Pretty much just do a POST of your JSON data from within your code and it will convert it into a basic table for instant search and sort. Made with love for the fun of it, no ads, no paid anything, it's totally free. Please only send in sanitized/test data only, this is meant to help make webdev a bit easier and more fun.…
More dev tools this month
the category →
open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.
Dev tools · 28d ago · github.com
Contribute to reladraw/reladraw development by creating an account on GitHub.
Dev tools · 26d ago · github.com
OpenBot▲362Grok Bot alternative: free, local, open-source, multiplayer
Dev tools · 23d ago · openbot.run
Talanoa▲346Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…
Dev tools · 21d ago · talanoa.email
CoreSpeed▲332One MCP for everything your agents need: apps, memory, tools
Dev tools · 29d ago · corespeed.io
Source: Product Hunt launch ↗
Launched alongside, February 2025
the whole month →
Screen Studio 3.0▲1,832Beautiful screen recordings with instant shareable links
Growth · 2025 · screen.studio
- IG
I was at FB/Meta from late 2013 to early 2023, mostly working in the compiler/runtime spaces. I got hit in the spring 2023 layoff wave. I immediately started making games in my newfound free time (a lifelong interest, and I even worked in AA(A?) back ca. ~2000), and in October 2023 I stumbled upon the idea of a roguelike pachinko/plinko game inspired by Luck Be A Landlord. Things snowballed quickly, I started talking to publishers, then worked like crazy through all of 2024, almost the hardest I've ever worked in my career, and launched the game in December 2024. It's sold…
Work · 2025
i wanted to change the habit of reaching for my phone in the morning and doomscrolling away an hour so i built an app to help me. now i have to literally touch grass before accessing my most distracting apps the app is built in swiftui, uses the screen time apis provided by apple and google vision to recognise grass or not i'd love to get your thoughts on the concept.
Life & fun · 2025 · touchgrass.now