Developer Tools

Time zones, JSON, and regex utilities built for speed, privacy and clarity.

Jump into the tools you need as a developer: align meetings across time zones, format or validate JSON responses, and test regex patterns with safe guards and quick highlights.

Istanbul vs New York vs Tokyo Paste API response, copy formatted Find emails or URLs safely Prepare SQL IN lists from IDs Copy hex or Base64 instantly Generate a list for tests & seeds Seconds vs ms without guessing Text/hex/file/Base64/Data URI Debug exp/nbf/iat, kid & JWKS Find ICO/PNG/SVG + Apple touch Paste CSV from a sheet, get JSON Generate ready-to-paste structured data Identify Googlebot, GPTBot, browsers, devices Preview a URL on every platform at once Spot schema drift between API versions Paste a response, copy a typed interface README to HTML, blog import back to MD Pretty-print messy production HTML Tweak a landing page and export it Format CSS with selector indentation Format ES2024, JSX, async/await PostgreSQL · MySQL · T-SQL · BigQuery Convert Kubernetes manifests for debugging Debug SOAP responses or RSS feeds

JSON & Data

JSON Viewer

Format, tree view, copy

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JSON Diff

Compare two JSON documents side by side

Open →

JSON → TypeScript

Generate TypeScript interfaces from JSON

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CSV ↔ JSON

Convert CSV to JSON and JSON to CSV in your browser

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YAML ↔ JSON

Convert YAML to JSON and JSON to YAML

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XML ↔ JSON

Convert XML to JSON and JSON to XML

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Pretty-print & Minify

HTML Formatter

Beautify or minify HTML markup

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CSS Formatter

Beautify or minify CSS, SCSS, LESS

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JS Formatter

Beautify or minify JavaScript / TypeScript

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SQL Formatter

Format SQL across 17+ dialects

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Markdown ↔ HTML

Convert Markdown to HTML and HTML to Markdown

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Visual HTML Editor

Edit text, rearrange & resize HTML blocks, export

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Text & Regex

Regex Tester

Flags, highlight, replace

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Text Cleaner

Clean, dedupe, sort, and format line lists

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Time & Dates

Timestamp Converter

Unix ↔ ISO, UTC/local

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Time Zone Converter

Compare multiple cities

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Generators & Crypto

Hash Generator

MD5/SHA-1/SHA-256/HMAC

Decode, verify, sign JWTs

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CRC Calculator

Text/hex/file Base64/Data URI

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Web & SEO

OG / Social Preview

Facebook, X, LinkedIn, Slack, Discord previews

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Favicon Downloader

Extract website icons

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User Agent Parser

Browser, OS, device, bot detection

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Schema.org JSON-LD Builder

Article, Product, FAQ, LocalBusiness, Breadcrumb

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Other tool families

Not the right family? These are the neighbouring sets people usually need next.

3D Printing11 Text9 File Inspection6 Image12 Photo archive1 Convert11 Docs19 Audio10 Network14 Tutorials3

Time Zone Converter

Compare cities and working hours

Istanbul vs New York vs Tokyo

Open →

JSON Viewer

Format, minify, tree view

Paste API response, copy formatted

Open →

Regex Tester

Flags, replace, highlight

Find emails or URLs safely

Open →

Text Cleaner

Clean, dedupe, sort, transform

Prepare SQL IN lists from IDs

Open →

Hash Generator

MD5/SHA-1/SHA-256/HMAC

Copy hex or Base64 instantly

Open →

UUID/ULID Generator

UUID v4 + ULID

Generate a list for tests & seeds

Open →

Timestamp Converter

Unix ↔ ISO, UTC/local

Seconds vs ms without guessing

Open →

CRC Calculator

CRC-32/16/8 presets + custom model

Text/hex/file/Base64/Data URI

Open →

JWT Tool

Decode, verify, sign

Debug exp/nbf/iat, kid & JWKS

Open →

Favicon Downloader

Extract and download site icons

Find ICO/PNG/SVG + Apple touch

Open →

CSV ↔ JSON

Convert CSV to JSON and back

Paste CSV from a sheet, get JSON

Open →

Schema.org JSON-LD Builder

Article, Product, FAQ, LocalBusiness, Breadcrumb

Generate ready-to-paste structured data

Open →

User Agent Parser

Browser, OS, device, bot detection

Identify Googlebot, GPTBot, browsers, devices

Open →

OG / Social Preview

Facebook · X · LinkedIn · Slack · Discord

Preview a URL on every platform at once

Open →

JSON Diff

Compare two JSON documents side by side

Spot schema drift between API versions

Open →

JSON → TypeScript

Generate interfaces from a JSON sample

Paste a response, copy a typed interface

Open →

Markdown ↔ HTML

Convert both directions with GFM support

README to HTML, blog import back to MD

Open →

HTML Formatter

Beautify or minify markup

Pretty-print messy production HTML

Open →

Visual HTML Editor

Edit, rearrange & resize HTML blocks

Tweak a landing page and export it

Open →

CSS Formatter

Beautify or minify stylesheets

Format CSS with selector indentation

Open →

JS Formatter

Beautify or minify JavaScript / TypeScript

Format ES2024, JSX, async/await

Open →

SQL Formatter

17 dialects, keyword case, indent

PostgreSQL · MySQL · T-SQL · BigQuery

Open →

YAML ↔ JSON

Convert both directions with JSON-safe parsing

Convert Kubernetes manifests for debugging

Open →

XML ↔ JSON

Attributes, namespaces, both directions

Debug SOAP responses or RSS feeds

Open →

Developer Tools FAQ

How many time zones can I compare?

Add up to five target cities plus a source zone; working-hour overlays help schedule calls.

Is JSON parsing private?

Yes. JSON is parsed locally in your browser and never sent to servers.

How are regex hangs prevented?

Regex runs in a Web Worker with length limits and a 150 ms timeout to reduce ReDoS risk.

Can I sort JSON keys?

Enable key sorting before formatting to produce deterministic output for code reviews.

Can I copy and download outputs?

Every tool includes copy buttons, and JSON viewer can download .json files.

About

Time zones, JSON, and regex utilities built for speed, privacy and clarity.

Jump into the tools you need as a developer: align meetings across time zones, format or validate JSON responses, and test regex patterns with safe guards and quick highlights.

FAQ

›How many time zones can I compare?

Add up to five target cities plus a source zone; working-hour overlays help schedule calls.

›Is JSON parsing private?

Yes. JSON is parsed locally in your browser and never sent to servers.

›How are regex hangs prevented?

Regex runs in a Web Worker with length limits and a 150 ms timeout to reduce ReDoS risk.

›Can I sort JSON keys?

Enable key sorting before formatting to produce deterministic output for code reviews.

›Can I copy and download outputs?

Every tool includes copy buttons, and JSON viewer can download .json files.

Every one of these runs in your browser, so a payload with customer data in it never leaves your machine. The viewers are built for files that are too big or too nested to read raw, the converters keep types instead of flattening everything to strings, and the JWT tool decodes without ever sending the token anywhere.