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dev101.io — One box for every dev utility — runs in your browser

dev101.io

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What 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.

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Two ratings

SiteList review score

Privacy-first, keyboard-driven utility suite with elite performance.

Reviewed on Aug 30, 2026

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Screenshots

Captured during our latest review on Aug 30, 2026

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Tools · dev101.io
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Pricing details

All tools are free, client-side, and require no account.

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Key features

  • JSON Formatter & Validator

    JSON Tools

    Format, validate, and minify JSON documents privately in the browser.

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  • JWT Decoder

    Code Tools

    Decode JSON Web Tokens to inspect headers, payloads, and signatures client-side.

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  • Cron Expression Parser

    Time Tools

    Explain cron schedules in plain English and preview upcoming run times.

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  • DNS Lookup

    Network Tools

    Resolve hostnames to various record types via Cloudflare DNS over HTTPS.

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  • Password Generator

    Crypto Tools

    Generate secure, random passwords using the browser's Web Crypto API.

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  • Text Diff

    Text Tools

    Compare two text blobs side-by-side with line and word-level highlighting.

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  • Keyboard-driven navigation (⌘K)

    Platform

    Jump to any tool instantly using a global command palette.

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  • Shareable state via URL hash

    Platform

    Tool inputs are encoded in the URL hash for sharing without server-side storage.

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Who it’s for

  • Inspecting sensitive production payloads

    Formatting and querying JSON data without risk of server-side logging or data exfiltration.

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  • Debugging JWT claims

    Decoding tokens to verify claims and headers during development.

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  • Verifying cron schedules

    Ensuring complex cron expressions match intended execution intervals.

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  • Generating secure passwords

    Creating high-entropy passwords locally using cryptographically secure random number generators.

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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.

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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.

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Does Slugify handle non-Latin scripts?

It transliterates common European accents (é→e, ü→u, etc.) and strips everything else.

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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.

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Product FAQ information · View source

The expert review

dev101.io earns a strong 87/100 for its elite performance and privacy-first, keyboard-driven utility suite.

87/100: high-performance utility hub with minor accessibility gaps

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Scores across 13 dimensions

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Docs & measurement

Domain
dev101.io
Category
Web utilities & converters
Pricing
Free · $0/mo
Platforms
web
Last checked
Aug 30, 2026
Public dimensions
13

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