All-in-one Developer Toolkit

Your local-first developer tools, all in one box.

Format JSON, compare API responses, validate schemas, decode JWTs, and run everyday utilities locally in your browser.

Try Online Get DevToolsBox
100% local No sign-up No payload tracking Privacy-first
DevToolsBox JSON Formatter showing beautified JSON in a split input and output editor
100% local & privatePayloads stay in your browser.
Fast & lightweightNo server round trips.
Developer-friendlyKeyboard-first, clean UI.
No account requiredStart using core tools immediately.
Powerful tools

Everything you need. Right where you need it.

DevToolsBox brings common developer utilities together with a premium, local-first workflow.

  • JSON FormatterBeautify, minify, sort, escape, validate, and inspect JSON.
  • JSON DiffCompare API responses and see semantic differences.
  • Schema ValidatorValidate JSON against schemas and generate starter schemas.
  • Quick UtilitiesBase64, URL, timestamp, JWT, UUID, and hash tools.
DevToolsBox Diff comparing two JSON payloads side by side with highlighted changes
Tools directory

Launch with the tools developers use every day.

Each tool can become its own SEO page later, with the working utility embedded directly on the page.

JSON Formatter

Beautify, minify, validate, sort, escape, and inspect JSON.

JSON Diff

Compare two payloads with JSON-aware results and summaries.

Schema Validator

Validate common JSON Schema rules locally in the browser.

JWT Decoder

Decode header and payload with visible signature warnings.

Base64 + URL

Encode and decode everyday strings without leaving the page.

Timestamp Converter

Convert Unix timestamps and human-readable dates quickly.

UUID Generator

Generate UUIDs for testing and development workflows.

Hash Generator

Create common hashes for quick verification and debugging.

Web Tools Lite

Try DevToolsBox online.

Use essential developer tools directly in your browser. No signup, no upload, local-only.

Open Web Tools How privacy works
Local-only: your data stays in your browser.
  • JSON Formatter
  • JSON Diff
  • Schema Validator
  • JWT Decoder
  • Base64
  • URL Encoder
See it in action

Real screenshots from the DevToolsBox extension.

Every tool runs locally in a fast, keyboard-first interface — here is exactly what you get.

DevToolsBox JSON Formatter with beautified JSON in a split input and output editor

JSON Formatter

Beautify, minify, sort, escape, validate, and inspect JSON locally.

DevToolsBox Diff comparing two JSON payloads with highlighted differences

Diff

Compare payloads with readable, JSON-aware change summaries.

DevToolsBox Tools tab showing the JWT decoder output

Tools

JWT, Base64, URL, UUID, hashing, cron, color, and more.

DevToolsBox regex tester showing matches and capture groups

Regex Tester

Test patterns live with match highlighting and capture groups.

DevToolsBox icon
Privacy

Your data is yours. Always.

DevToolsBox is built with privacy by design. We do not collect, store, or transmit your developer data. Everything runs locally in your browser.

Read the privacy policy
No Uploads

Data never leaves your device.

No Tracking

No payload analytics or hidden collection.

No Accounts

Use core tools without sign-up.

Local History

Optional history stays in browser storage.

Developer feedback

Built for developers who prefer local tools.

We are collecting real Chrome Web Store ratings and user reviews after launch. Until then, the product promise stays simple: fast tools, local processing, no account required.

FAQ

Built for trust, speed, and daily use.

Does DevToolsBox upload my payloads?

No. DevToolsBox processes payloads locally in your browser and does not upload, store, sell, or track your JSON, JWTs, schemas, API responses, logs, or text inputs.

Is it only a Chrome extension?

Chrome is the first release. The roadmap includes web tools, Edge, Firefox, Safari, VS Code, CLI, and team features.

Can I use the web tools without installing?

Yes. The website is designed to become a working tool platform with dedicated pages for each utility.

One toolbox for everyday developer work.

Install DevToolsBox free and help shape the next month of local-first developer workflows.

Add to Chrome - It's free View Privacy