Developer Tools · 82 tools

JSON, XML, CSS and HTML formatters, JSON to YAML and TypeScript, robots.txt, sitemap, JWT, UUID, regex, SQL, Mermaid, chmod, subnet, hashing, cron and more — everything a dev needs in one place.

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JSON Formatter – Format, validate & minify JSON

Base64 Encoder – Encode & decode Base64 strings

URL Encoder – Encode & decode URL strings

HTML Encoder – Encode & decode HTML entities

Hash Generator – SHA-1 / SHA-256 / SHA-512 hashes

Regex Tester – Live regex with match highlights

CSV to JSON – Convert CSV data to clean JSON

Number Base Converter – Binary / Octal / Decimal / Hex

Timestamp Converter – Unix ↔ Human-readable dates

Markdown Previewer – Live Markdown editor & preview

JSON to Table – Visualise JSON as an HTML table

Code Minifier – Minify CSS & HTML code

UUID Generator – Generate random v4 UUIDs in bulk

JWT Decoder – Decode JWT header, payload & expiry

JSON to CSV – Convert JSON arrays to CSV for Excel

Markdown to HTML – Convert Markdown into clean HTML code

String Escape / Unescape – Escape & unescape JSON, JS and regex text

HTTP Status Code Lookup – Meaning of every HTTP status code

Cron Expression Explainer – Explain cron schedules & next run times

HTML to Text Converter – Strip HTML tags and get plain text

SQL Formatter – Beautify or minify SQL queries

URL Parser – Split a URL into parts and query params

JSON Validator – Check JSON and find the exact error line

JSON Path Finder – Query JSON with paths like $.users[0].name

URL Decoder – Decode %20 style URL text to readable form

JSON Minifier – Compress JSON into one small line

XML Formatter – Beautify or minify XML with clean indentation

HTML Beautifier – Indent and clean messy HTML code

CSS Formatter – Beautify or minify CSS stylesheets

JSON to XML – Convert JSON data into XML markup

Markdown Table Generator – Turn CSV or Excel cells into a Markdown table

Meta Tag Generator – Make SEO, Open Graph & Twitter meta tags

Chmod Calculator – Unix file permissions — numeric and symbolic

IP Subnet Calculator – Network, broadcast and host range from CIDR

Mermaid Diagram Editor – Write Mermaid code, see the diagram, export SVG/PNG

JSON Key Sorter – Sort JSON keys A–Z, even nested

JSON to YAML Converter – Convert JSON into clean YAML

JSON to TypeScript Converter – Generate TypeScript interfaces from JSON

JSON Compare Tool – Compare two JSON files and list changes

Base32 Encoder & Decoder – Encode and decode Base32 text

Robots.txt Generator – Create a robots.txt file for your site

Sitemap XML Generator – Build sitemap.xml from a list of URLs

htaccess Redirect Generator – Create 301/302 redirect rules for Apache

CSV to SQL INSERT Converter – Turn CSV rows into SQL INSERT statements

HTML Entity Encoder & Decoder – Encode and decode HTML entities

User Agent Parser – Detect browser, OS and device from a UA string

JSON to Query String – Convert JSON ↔ URL query parameters

Screen & Browser Info Checker – Screen size, pixel ratio and device details

YAML Formatter – Format and indent YAML neatly

YAML Validator – Find YAML syntax errors with line numbers

YAML to JSON Converter – Turn YAML configs into JSON

XML to JSON Converter – Turn XML into JSON in your browser

JavaScript Formatter & Beautifier – Beautify and indent JavaScript code

JavaScript Minifier – Compress JS with Terser — smaller, faster files

HTTP Headers Parser – Explain HTTP headers and check security headers

DNS Lookup – Check DNS records of any domain

CORS Tester – Check if an API allows cross-origin requests

.gitignore Generator – Create a .gitignore for your stack

Regex Builder – Pick a pattern, test it, copy the regex

API Request Builder – Send API requests and copy cURL or fetch code

Text to HTML List Converter – Lines → <ul> / <ol> list code

CSV to HTML Table Converter – Paste CSV, get <table> HTML

HTML to Markdown Converter – Convert HTML code to Markdown

HTML Table Generator – Make table HTML with rows and columns

CSS Minifier – Shrink CSS and see bytes saved

HTML Minifier – Compress HTML and see bytes saved

Fake Data Generator (Test Users JSON/CSV) – Mock user data as JSON or CSV

Git Commands Cheat Sheet – Search the most-used Git commands

Linux Commands Cheat Sheet – Search common Linux terminal commands

IP Address Validator (IPv4 & IPv6) – Validate IPv4/IPv6 and spot private ranges

Excel to JSON Converter – Turn XLSX, XLS or CSV sheets into clean JSON

CSV to Excel Converter – Convert CSV files or pasted text to XLSX

JSON to Excel Converter – Convert a JSON array to an XLSX spreadsheet

Excel to CSV Converter – Save any Excel sheet (or all sheets) as CSV

JSON Schema Generator (from JSON) – Create a JSON Schema from sample JSON

cURL to Fetch / Axios / Python Converter – Turn curl commands into fetch, Axios or Python code

SVG Optimizer (Minify & Clean SVG) – Make SVG code smaller without changing how it looks

HTML to JSX Converter (React) – Convert HTML into valid React JSX

Base58 Encoder & Decoder – Encode and decode Base58 (Bitcoin alphabet)

UUID Validator (Check Version & Format) – Check UUIDs and see their version and variant

CRC32 & Adler-32 Checksum Generator – Get the CRC32 and Adler-32 checksum of any text

Unicode Escape Converter (\uXXXX) – Turn text into \u escapes and back

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