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 TokyoPaste API response, copy formattedFind emails or URLs safelyPrepare SQL IN lists from IDsCopy hex or Base64 instantlyGenerate a list for tests & seedsSeconds vs ms without guessingText/hex/file/Base64/Data URIDebug exp/nbf/iat, kid & JWKSFind ICO/PNG/SVG + Apple touchPaste CSV from a sheet, get JSONGenerate ready-to-paste structured dataIdentify Googlebot, GPTBot, browsers, devicesPreview a URL on every platform at onceSpot schema drift between API versionsPaste a response, copy a typed interfaceREADME to HTML, blog import back to MDPretty-print messy production HTMLFormat CSS with selector indentationFormat ES2024, JSX, async/awaitPostgreSQL · MySQL · T-SQL · BigQueryConvert Kubernetes manifests for debuggingDebug SOAP responses or RSS feeds
JSON Viewer
Format, tree view, copy
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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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JSON Diff
Compare two JSON documents side by side
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JSON → TypeScript
Generate TypeScript interfaces from JSON
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Markdown ↔ HTML
Convert Markdown to HTML and HTML to Markdown
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Regex Tester
Flags, highlight, replace
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Text Cleaner
Clean, dedupe, sort, and format line lists
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Timestamp Converter
Unix ↔ ISO, UTC/local
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Time Zone Converter
Compare multiple cities
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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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Hash Generator
MD5/SHA-1/SHA-256/HMAC
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UUID/ULID Generator
UUID v4 + ULID
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CRC Calculator
Text/hex/file Base64/Data URI
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JWT Tool
Decode, verify, sign JWTs
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Schema.org JSON-LD Builder
Article, Product, FAQ, LocalBusiness, Breadcrumb
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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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OG / Social Preview
Facebook, X, LinkedIn, Slack, Discord previews
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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 →
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.
About
Time zones, JSON, and regex utilities built for speed, privacy and clarity.
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.