LocalOnly

Developer tools that never touch a server

6 followers

Developer tools that never touch a server

6 followers

A fast, privacy-first developer toolkit. Format, validate, convert and inspect JSON - plus dozens of developer utilities. Everything runs 100% in your browser. No uploads, no tracking, no backend.

This is the 2nd launch from LocalOnly. View more

LocalOnly: toolkit for JSON & developers

Launched this week

The privacy-first toolkit for JSON & developers - localonly

37 free developer tools that run entirely in your browser: JSON formatter, diff, JSONPath, YAML, CSV and XML converters, JWT, Base64, UUID and a PlantUML editor. Nothing you paste is uploaded, it works offline, and share links keep your data inside the link

LocalOnly: toolkit for JSON & developers gallery image

Free

Launch tags:Productivity•Privacy•Developer Tools

Launch Team / Built With

Maker

📌

Hi Product Hunt 👋 I'm Kiran. I built LocalOnly because I kept pasting API responses, JWTs and config files into online tools without knowing where that data went. LocalOnly puts 37 developer tools in one place, and every one of them runs in your browser. You can format and compare JSON, test JSONPath queries, convert between JSON, YAML, CSV and XML, decode JWTs, generate UUIDs, hash files and draw PlantUML diagrams, all without uploading what you paste. What makes it different: The PlantUML editor renders diagrams in your browser, with no server and no Java, and exports PNG and SVG Share links carry the data inside the link itself, optionally protected with a password It works offline once loaded, and you can install it as an app Every tool has a guide with tested JavaScript and Python examples It's free and needs no account. I'd love your feedback, especially on which tool you'd like next. 👉 https://localonly.dev/

Report

4d ago

Previous LocalOnly Launches

LocalOnlyDeveloper tools that never touch a server

Launched on July 21st, 2026

Forum Threads

p/localonly

•

4d ago

Do you paste API responses, JWTs or config files into online tools?

Quick question for the developers here

When you need to format a JSON response, decode a JWT or check a config file, where do you paste it? A lot of us use the first online tool that comes up in a search, without knowing whether that data is sent to a server or logged

That's the reason I built LocalOnly: 37 free developer tools that run entirely in your browser. JSON formatter and diff, JSONPath, YAML, CSV and XML converters, a JWT decoder, Base64, UUID, a PlantUML editor and more. Nothing you paste is uploaded, and it works offline once loaded.

I'm curious how others handle this:

p/localonly

•

2mo ago

New Update: PlantUML diagrams that never leave your browser

A free PlantUML editor that runs entirely in your browser. The official engine is compiled to JavaScript, so your diagram source is never uploaded. Live preview, PNG/SVG export, templates, share links and offline support. No account, no Java, no Graphviz.

Explore at https://localonly.dev/plantuml/

View all