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US Court of Appeals: TOS may be updated by email, use can imply consent [pdf]

https://cdn.ca9.uscourts.gov/datastore/memoranda/2026/03/03/25-403.pdf
168•dryadin•3h ago•84 comments

Fontcrafter: Turn Your Handwriting into a Real Font

https://arcade.pirillo.com/fontcrafter.html
15•rendx•56m ago•3 comments

Agent Safehouse – macOS-native sandboxing for local agents

https://agent-safehouse.dev/
578•atombender•13h ago•143 comments

Microscopes can see video on a laserdisc

https://www.youtube.com/watch?v=qZuR-772cks
440•zdw•1d ago•55 comments

PCB devboard the size of a USB-C plug

https://github.com/Dieu-de-l-elec/AngstromIO-devboard
178•zachlatta•1d ago•34 comments

Ask HN: What Are You Working On? (March 2026)

154•david927•10h ago•520 comments

We should revisit literate programming in the agent era

https://silly.business/blog/we-should-revisit-literate-programming-in-the-agent-era/
239•horseradish•14h ago•141 comments

Every single board computer I tested in 2025

https://bret.dk/every-single-board-computer-i-tested-in-2025/
168•speckx•3d ago•52 comments

Show HN: Mcp2cli – One CLI for every API, 96-99% fewer tokens than native MCP

https://github.com/knowsuchagency/mcp2cli
77•knowsuchagency•5h ago•44 comments

FrameBook

https://fb.edoo.gg
433•todsacerdoti•19h ago•72 comments

The death of social media is the renaissance of RSS (2025)

https://www.smartlab.at/rss-revival-life-after-social-media/
148•jruohonen•5h ago•85 comments

My Homelab Setup

https://bryananthonio.com/blog/my-homelab-setup/
235•photon_collider•17h ago•152 comments

Linux Internals: How /proc/self/mem writes to unwritable memory (2021)

https://offlinemark.com/an-obscure-quirk-of-proc/
84•medbar•11h ago•18 comments

I love email (2023)

https://blog.xoria.org/email/
14•surprisetalk•3d ago•4 comments

How the Sriracha guys screwed over their supplier

https://old.reddit.com/r/KitchenConfidential/comments/1ro61g2/how_the_sriracha_guys_screwed_over_...
184•thunderbong•6h ago•49 comments

Artificial-life: A simple (300 lines of code) reproduction of Computational Life

https://github.com/Rabrg/artificial-life
111•tosh•13h ago•12 comments

Unlocking Python's Cores:Energy Implications of Removing the GIL

https://arxiv.org/abs/2603.04782
3•runningmike•3d ago•1 comments

I made a programming language with M&Ms

https://mufeedvh.com/posts/i-made-a-programming-language-with-mnms/
82•tosh•16h ago•35 comments

Why can't you tune your guitar? (2019)

https://www.ethanhein.com/wp/2019/why-cant-you-tune-your-guitar/
211•digitallogic•4d ago•149 comments

My “grand vision” for Rust

https://blog.yoshuawuyts.com/a-grand-vision-for-rust/
192•todsacerdoti•4d ago•189 comments

Living human brain cells play DOOM on a CL1 [video]

https://www.youtube.com/watch?v=yRV8fSw6HaE
191•kevinak•19h ago•192 comments

Pushing and Pulling: Three reactivity algorithms

https://jonathan-frere.com/posts/reactivity-algorithms/
102•frogulis•1d ago•16 comments

Triumph of the toons: how animation came to rule the box office

https://economist.com/culture/2026/03/05/triumph-of-the-toons-how-animation-came-to-rule-the-box-...
19•andsoitis•3d ago•20 comments

Z80 Sans – a disassembler in a font (2024)

https://github.com/nevesnunes/z80-sans
114•pabs3•4d ago•12 comments

WSL Manager

https://github.com/bostrot/wsl2-distro-manager
104•gballan•16h ago•55 comments

Humanoid robot: The evolution of Kawasaki’s challenge

https://kawasakirobotics.com/in/blog/202511_kaleido/
15•hhs•3d ago•2 comments

Ask HN: How to be alone?

472•sillysaurusx•22h ago•341 comments

The legendary Mojave Phone Booth is back (2013)

https://dailydot.com/mojave-phone-booth-back-number
32•1970-01-01•2d ago•6 comments

Show HN: Skir – like Protocol Buffer but better

https://skir.build/
89•gepheum•17h ago•46 comments

Show HN: I built a real-time OSINT dashboard pulling 15 live global feeds

https://github.com/BigBodyCobain/Shadowbroker
240•vancecookcobxin•15h ago•100 comments
Open in hackernews

Show HN: Convert Large CSV/XLSX to JSON or XML in Browser

https://csvforge.com
41•Botlabs•10mo ago
Hello HN, I'm excited to share a project I've been working on: A simple, fast way to process huge CSV and XLSX files directly in your browser and export them as clean JSON or XML

Here's a few things that makes this converter different: - runs in the browser - all parsing and conversion is client side can handle data any size data - automatically detects delimiters, encodings, and data types as it parses - Live preview with column renaming, search/replace, and data cleanup - Export to JSON or XML — clean, structured output that can be used for API or Databases

backstory: I built this tool for myself. I work with massive CSV and TXT files, some over 10GB, and opening them in Excel would freeze my laptop, some of the online converters only limits to a certain size, so I started learning Python and pandas but ended up wasting so much time trying different delimiters or fixing badly structured data just to make it usable, and I thought this would be a really fun project to build

I'd love some feedback. Thank you

URL: https://csvforge.com

Comments

sverhagen•10mo ago
"Runs in the browser" and "client side" isn't as much of a selling point to me as it's made out to be. It's a claim that I can't really validate until it's too late. If it's a commercial service I'm going to have to pay for, then maybe you should go all the way in gaining my trust with whatever safeguards it takes, so that I no longer care if I upload my data to your server or not.
rustc•10mo ago
> then maybe you should go all the way in gaining my trust with whatever safeguards it takes

What kind of safeguards are possible with a web app?

sverhagen•10mo ago
I think this comes down to legally-enforceable contracts with some teeth. A lot of business seem okay to trust Google's cloud products, or Microsoft's? I think as private person with limited means for litigation, you're likely sol.
hahn-kev•10mo ago
Yeah I really wish there was a way for this to be enforced by the browser that the end user could trust. It would have to be a standard, but outside of opening dev tools and toggling offline mode there's no way to be sure.

The funny thing is that it feels safer to download a desktop app and give it the same data even though it's usually much harder to validate if it's shipping your data somewhere else.

strogonoff•10mo ago
There’s a cheap trick to make sure a website that claims to do everything client-side actually does everything client-side:

1. Open the site in an incognito window.

2. Turn off your Internet.

3. Do what you’ve got to do.

4. Close browser window.

As a bonus, and this makes it better than just flipping the offline switch in developer tools, if you turn off Internet in a way that keeps the browser thinking it’s online, you can also peek at whether any network requests are made (for pathological cases where the app does everything locally but phones home anyway).

Botlabs•10mo ago
Sure, but you can validate it dev tools exist for a reason. Honestly, I just can’t afford the storage costs if users are uploading 50GB+ CSVs. It’d be a huge strain on any server, not to mention painfully slow for users. Running everything client side was the easiest and most practical way to build this MVP at least for me thanks for the feedback
o11c•10mo ago
"Large" generally means "bigger than RAM"; 10GB is medium-sized these days since it fits in most people's RAM. Does the browser actually have the (web worker?) APIs needed to stream and "upload" and "download"?
shubhamjain•10mo ago
I don't get it. Are JSON and XML files more friendly to import vs CSV files? I always assumed CSVs were the standard. Any reasons to prefer structured formats?

Shameless plug: I am working on a similar problem of Excel not being a great tool for large datasets. My desktop app[1] lets you import raw data files and query them using SQL. (The website needs to be updated, the app looks much better than the current screenshots).

[1]: https://textquery.app

Botlabs•10mo ago
yes they are a lot easier to work with when inserting into the database
snappr021•10mo ago
This type of thing is fairly trivial to create with ChatGPT running entirely locally in HTML.

A couple of kb of open standard vanilla js that does some simple things faster than legacy spreadsheets etc ever could.

Even to the point of creating invoices, reports etc based on standard filters stored in local storage…

oschvr•10mo ago
Looks like you made it in lovable. It has that characteristic UI.

If so, how much time did it take you?

Botlabs•10mo ago
thanks for your comment, it took me almost 3 weeks to build this
constantcrying•10mo ago
I think it should go without saying, but never use this with anything more relevant than a hobby project.

Doing this with any kind of data you don't fully own (e.g. data from your company) is a terrible idea, from so many standpoints. That it is "allegedly" running locally is not making it much better.

I think my question to OP is, who is this for. Any developer can write up a convert for his own datasets, in basically any case I can think of where you are handling large amounts of data you are building a pipeline to do cleanup, renaming, conversion, etc. Who wants to have a part of that pipeline be uploading the data into the browser?