SiteList review score
Privacy-first, keyboard-driven utility suite with elite performance.
13 dimensions
Reviewed on Aug 30, 2026
dev101.io — One box for every dev utility — runs in your browser
dev101.io
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Claim itWhat it does
Privacy-first, keyboard-driven hub for 60+ developer utilities including JSON formatting, JWT decoding, and cryptographic hashing. All transforms run 100% client-side in the browser, ensuring data never leaves the user's machine.
Two ratings
Verified user rating
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Screenshots
Captured during our latest review on Aug 30, 2026
Pricing details
All tools are free, client-side, and require no account.
View sourceKey features
JSON Formatter & Validator
JSON Tools
Format, validate, and minify JSON documents privately in the browser.
JWT Decoder
Code Tools
Decode JSON Web Tokens to inspect headers, payloads, and signatures client-side.
Cron Expression Parser
Time Tools
Explain cron schedules in plain English and preview upcoming run times.
DNS Lookup
Network Tools
Resolve hostnames to various record types via Cloudflare DNS over HTTPS.
Password Generator
Crypto Tools
Generate secure, random passwords using the browser's Web Crypto API.
Text Diff
Text Tools
Compare two text blobs side-by-side with line and word-level highlighting.
Keyboard-driven navigation (⌘K)
Platform
Jump to any tool instantly using a global command palette.
Shareable state via URL hash
Platform
Tool inputs are encoded in the URL hash for sharing without server-side storage.
Who it’s for
Inspecting sensitive production payloads
Formatting and querying JSON data without risk of server-side logging or data exfiltration.
Debugging JWT claims
Decoding tokens to verify claims and headers during development.
Verifying cron schedules
Ensuring complex cron expressions match intended execution intervals.
Generating secure passwords
Creating high-entropy passwords locally using cryptographically secure random number generators.
Buyer questions
Questions buyers actually ask
Is my JSON uploaded anywhere?
No. Every JSON tool here runs fully client-side in your browser via JavaScript. There is no server round-trip, no analytics payload containing your data, and no logging.
What is the largest JSON document I can paste?
Practically, browsers handle a few megabytes comfortably. Above ~10MB you may hit tab-freeze during JSON.parse.
Does Slugify handle non-Latin scripts?
It transliterates common European accents (é→e, ü→u, etc.) and strips everything else.
Can I encode binary files?
Yes — the Data URL tool accepts file uploads and emits a Base64 data URI with auto-detected MIME type. Everything runs client-side.
Product FAQ information · View source
The expert review
dev101.io earns a strong 86.9/100 for its elite performance and privacy-first, keyboard-driven utility suite.
86.9/100: high-performance utility hub with minor accessibility gaps
Verified user reviews
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Reviews are from the SiteList community. Some reviewers received incentives — disclosed in the review, always. The verdict is never for sale.
Scores across 13 dimensions
Brand & experience
Performance
Content & editorial
Trust & decision surfaces
Search & discoverability
Docs & measurement
- Domain
- dev101.io
- Category
- Web utilities & converters
- Pricing
- Free · $0/mo
- Platforms
- web
- Last checked
- Aug 30, 2026
- Dimensions reviewed
- 34
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