• Developer Tools

    Build, debug,
    ship faster.

    12 free developer utilities — JWT, JSON, SQL, regex, Base64 and more. All processing runs in your browser.

    Browse all toolsTry JWT Decoder12 tools
    • Developer Tools

    Decode anything.

    JWT, JSON, SQL, regex, and more — paste data, get instant results. Zero server round-trips.

    Featured

    JWT Decoder

    Decode JWT tokens in your browser. Inspect claims, live expiry countdown, weak-algorithm warnings, and copy fields — no upload, no signup.

    Open tool

    JSON to TypeScript Converter

    Convert JSON to TypeScript interfaces or Zod schemas. Toggle strict vs loose nulls, copy Zod output, and generate types from API responses — free, in-browser.

    Learn More

    JSON Diff

    Compare two JSON objects with added, removed, and changed summaries. Toggle show-only-changed view for cleaner diffs — semantic JSON diff runs locally, free to use.

    Learn More

    SQL Formatter

    Format SQL for PostgreSQL and MySQL with complexity badges and anti-pattern flags. Copy pretty or minified output — processed locally, no signup.

    Learn More

    YAML to JSON Converter

    Convert YAML, JSON, or TOML with anchor detection and key-depth stats. Paste config, see nesting depth, copy output — free converter, no signup.

    Learn More

    Base64 Encoder

    Encode and decode Base64 text or files with URL-safe mode and size ratios. Drop files, copy output instantly — all processing stays local in your browser.

    Learn More

    RegEx Tester

    Test regex with live match counts, flag explanations, and multi-line cases. Debug JavaScript patterns in real time — free, runs in your browser.

    Learn More

    Hash Generator

    Generate or verify MD5, SHA-1, SHA-256, SHA-512, and bcrypt hashes online. See digest lengths, compare hashes in verify mode — all computed locally in your browser.

    Learn More

    cURL Converter

    Convert curl to Python, JavaScript, TypeScript, or Go with parsed summaries and auth masking warnings. Paste any curl — copy-ready code in seconds.

    Learn More

    Markdown Previewer

    Preview markdown live with GFM or CommonMark modes. Copy rendered HTML, see word count and reading time — side-by-side editor runs in your browser, free and private.

    Learn More

    Password Generator

    Generate strong passwords with zxcvbn strength scores and crack-time estimates. Customize length and character sets, copy or clear — nothing stored on servers.

    Learn More

    Cron Builder

    Build cron schedules with live next-run countdown. Export to AWS EventBridge, Kubernetes CronJob, or GitHub Actions — plus daily and monthly run estimates.

    Learn More
    Home