JSON, YAML, XML & CSV35
JSON Formatter
JSON Input, Indent → Status, Output, Bytes
JSON Validator
JSON Input, Indent → Status, Output, Bytes
JSON to XML Converter
JSON Input → Status, XML Output
JSON to CSV Converter
JSON Array Input → Status, CSV Output
JSON Minifier
JSON Input, Indent → Status, Output, Bytes
JSON Beautifier
JSON Input, Indent → Status, Output, Bytes
JSON Path Finder
JSON Input, Dot path (e.g. 0.categories.1) → Status, Value at path, Details
JSON Diff Checker
JSON A (original), JSON B (changed) → Status
XML Formatter
XML Input → Status, Formatted XML
XML Validator
XML Input → Check, Formatted XML
XML to JSON Converter
XML Input, Indent → Status, JSON Output
YAML Formatter
YAML Input (or paste JSON to convert) → Status, YAML Output
YAML to JSON Converter
YAML Input (simple key: value), Indent → Status, JSON Output
CSV Viewer
CSV Input, Indent → Status, JSON Output
CSV to JSON Converter
CSV Input, Indent → Status, JSON Output
CSV to XML Converter
CSV Input → Status, XML Output
Kubernetes YAML Generator
Project / name → Status, K8s Deployment
Package.json Generator
Project / name → Status, package.json
Mock Data Generator
How many records?, Indent → Status, Fake JSON
Fake JSON Generator
How many records?, Indent → Status, Fake JSON
API Response Generator
How many records?, Indent → Status, Fake JSON
JSON to TypeScript
JSON, Root interface name → Status, TypeScript
JSON to Java
JSON, Root class name → Status, Java
JSON to C#
JSON, Root class name → Status, C#
JSON to Go
JSON, Root struct name → Status, Go
JSON to Rust
JSON, Root struct name → Status, Rust
JSON to Python
JSON, Root dataclass name → Status, Python
JSON to Kotlin
JSON, Root data class name → Status, Kotlin
JSON to Dart
JSON, Root class name → Status, Dart
JSON to Swift
JSON, Root struct name → Status, Swift
JSON Schema Generator
JSON sample, Schema title → Status, JSON Schema
JSON Schema Validator
JSON data, JSON Schema → Status, Validation report, Violations
JSON to YAML Converter
JSON → Status, YAML
JSON Flattener
JSON, Direction → Status, Result
CSV to SQL Converter
CSV (first row = column names), Table name → Status, SQL, Rows
Encoding, Hashing & IDs22
Base64 Encoder
Text to encode → Status, Base64
Base64 Decoder
Base64 to decode → Status, Decoded text
URL Encoder
Text / URL → Status, Encoded
URL Decoder
Encoded text → Status, Decoded
JWT Decoder
JWT token → Status, Decoded JWT
JWT Generator
Payload JSON, Header alg → Status, JWT
UUID Generator
How many? → Status, UUIDs
UUID v4 Generator
How many? → Status, UUIDs
MD5 Generator
Text to hash → Status, MD5 hash
SHA1 Generator
Text to hash → Status, SHA1 hash
SHA256 Generator
Text to hash → Status, SHA256 hash
SHA512 Generator
Text to hash → Status, SHA512 hash
HTML Entity Encoder
Text → Status, HTML entities
HTML Entity Decoder
Encoded HTML → Status, Decoded text
Binary Converter
Number, From base → Status, Decimal, Binary
Hex Converter
Number, From base → Status, Decimal, Binary
Character Encoding Converter
Text, Encode as → Status, Chars, Encoded output
CSS Box Shadow Generator
Offset X, Offset Y → Status, CSS
Image to Base64 Converter
Reads an image locally and outputs Base64 / Data URI / CSS / Markdown / JSON tabs
Base64 to Image Converter
Data URI or raw Base64 → Status, Image, Data URI
Unicode Code Point Converter
Text (or code points to decode), Direction → Status, Table, Characters
ULID Generator
How many, Or decode a ULID (optional) → Status, ULIDs, Timestamp
Formatters, Minifiers & Validators19
SQL Formatter
SQL Input → Status, Formatted SQL
SQL Minifier
SQL Input → Status, Minified SQL
HTML Formatter
HTML Input → Status, Output
CSS Formatter
CSS Input → Status, Output
JS Formatter
JavaScript Input → Status, Output
HTML Minifier
HTML Input → Status, Output
CSS Minifier
CSS Input → Status, Output
JS Minifier
JavaScript Input → Status, Output
HTML Validator
HTML → Status, Report
CSS Validator
CSS → Status, Report
OpenAPI Validator
OpenAPI JSON → Status, Report
GraphQL Formatter
GraphQL Input → Status, Output
GraphQL Validator
GraphQL → Status, Report
Diff Checker
Original (left), Changed (right) → Status
Text Compare Tool
Text A (original), Text B (changed) → Status
Code Beautifier
JSON Input, Indent → Status, Output, Bytes
Code Minifier
Code Input → Status, Output
Indentation Converter
Code, Spaces per tab → Status, Converted code
ESLint Config Generator
Project / name → Status, ESLint config
CSS, HTML & Frontend13
Markdown Previewer
Markdown → Status, HTML
Markdown to HTML Converter
Markdown → Status, HTML
HTML to Markdown Converter
HTML → Status, Markdown
CSS Grid Generator
Columns, Rows → Status, Grid CSS
Flexbox Generator
flex-direction, justify-content → Status, Flexbox CSS
CSS Animation Generator
Animation name, Effect → Live preview, Status, CSS animation
Border Radius Generator
Top-left, Top-right → Status, CSS
Font Face Generator
Font family, File path / URL → Status, CSS
Favicon Generator
Letter / emoji, Background → Status, Favicon preview, PNG data URI
SVG Optimizer
SVG markup → Status, Optimized SVG
CSS Selector Tester
HTML, CSS selector → Status, Matched elements, Matches
HTML to JSX Converter
HTML, Wrap in a React component → Status, JSX
Markdown Table Generator
CSV, TSV or JSON array, Alignment → Status, Table
Regex, Text & Code Generators25
SQL to MongoDB Converter
Simple SQL SELECT → Status, MongoDB find()
Regex Tester
Regex pattern, Flags (g i m s u y) → Status, Result, Count
Regex Generator
Pattern type, Flags → Status, Regex pattern, JavaScript snippet
Cron Expression Generator
Preset → Status, Cron
Cron Expression Parser
Cron expression → Status, Fields JSON
Camel Case Converter
Text → Status, Result
Snake Case Converter
Text → Status, Result
Kebab Case Converter
Text → Status, Result
Git Command Generator
What do you need?, Branch / tag / remote name → Status, Git commands
Docker Command Generator
Project / name → Status, Dockerfile
tsconfig Generator
Project / name → Status, tsconfig.json
Vite Config Generator
Project / name → Status, vite.config.js
SQL Query Builder
Table name, Columns (comma-separated, or *) → Status, Generated SQL
MongoDB Query Builder
Collection, Operation → Status, MongoDB shell
Elasticsearch Query Builder
Index, Field → Status, Elasticsearch query
Regex Cheat Sheet
Show → Status, Reference
Code Snippet Generator
Snippet, Name / path → Status, Code snippet
Comment Generator
Style, Comment text → Status, Commented text
Docstring Generator
Doc style, Function name → Status, Documentation
Variable Name Generator
Describe the variable → Status, Name variants
cURL to Code Converter
curl command, Convert to → Status, Code
cURL Command Generator
URL, Method → Status, curl command, Single line
Chmod Calculator
Convert from, Octal mode → Octal, Symbolic, Command
Semver Checker
What to do, Version → Status, Verdict, Details
Gitignore Generator
Language / framework, Second stack (optional) → Status, .gitignore
Network & Web20
Unix Timestamp Converter
Mode, Unix timestamp → Status, Unix (seconds), Unix (ms)
Timestamp to Date Converter
Mode, Unix timestamp → Status, Unix (seconds), Unix (ms)
Date to Timestamp Converter
Mode, Date / ISO string → Status, Unix (seconds), Unix (ms)
IP Address Converter
IP address → Status, Dotted decimal, Decimal
IPv4 to IPv6 Converter
IPv4 address, IPv6 format → Status, Result, IPv4-mapped
Subnet Calculator
IP address, CIDR prefix → Status, Subnet details
CIDR Calculator
IP address, CIDR prefix → Status, Subnet details
MAC Address Generator
How many? → Status, MAC addresses
User Agent Parser
User-Agent string → Status, Parsed JSON
HTTP Status Code Lookup
Status code → Status, Details
MIME Type Lookup
File extension or filename → Extension, MIME type
HTTP Header Generator
Header set → Status, HTTP headers
Certificate Decoder
PEM certificate → Status, Certificate info
SSL Checker
HTTPS URL → Status, Notes
DNS Lookup Tool
Domain, Record type → Status, DNS answers, Tip
WHOIS Lookup Tool
Domain → Status, WHOIS / RDAP, Tip
Port Scanner
Host, Ports (comma-separated) → Status, Port probe results, Tip
Ping Tool
Host / URL, Probes → Status, HTTP ping result, Tip
Traceroute Tool
Host → Status, Path probe, Tip
URL Parser
URL → Status, Components, Query parameters (decoded)
More developer tools22
BCrypt Generator
Password, Cost (rounds) → Status, BCrypt hash, Salt
Random Password Generator
Length → Status, Password
Pascal Case Converter
Text → Status, Result
Octal Converter
Number, From base → Status, Decimal, Binary
Number Base Converter
Number, From base → Status, Decimal, Binary
Bitwise Calculator
Value A, Value B → Status, Bitwise results
Content Type Generator
File extension or filename → Extension, MIME type
Tab to Space Converter
Code, Spaces per tab → Status, Converted code
Line Ending Converter
Text, Target ending → Status, Converted text
Nginx Config Generator
Project / name → Status, Nginx server block
Apache Config Generator
Project / name → Status, Apache vhost
HTAccess Generator
Project / name → Status, .htaccess
.env Generator
Project / name → Status, .env
Prettier Config Generator
Project / name → Status, Prettier config
Webpack Config Generator
Project / name → Status, webpack.config.js
Data URI Generator
Content, MIME type → Status, Data URI
CORS Header Generator
Header set → Status, HTTP headers
Content Security Policy Generator
Policy style → Status, Content-Security-Policy
PGP Key Generator
Name, Email → Status, Public key, Private key
Bandwidth Calculator
File size, Size unit → Status, Seconds, Human time
Data Transfer Calculator
File size, Size unit → Status, Seconds, Human time
XPath Tester
XML or HTML, XPath expression → Status, Matches, Matches
What the developer tools cover
This is the largest category on the site, and most of it exists because the same small jobs come up in every project: format and validate JSON, XML and YAML; convert between CSV and JSON; encode and decode Base64 and URLs; decode a JWT; hash text with SHA-256 or bcrypt; test a regular expression; convert a Unix timestamp; switch number bases; and generate UUIDs, cron expressions and boilerplate such as .gitignore files.
Everything runs in the page. That is the reason to use these instead of the first search result: you can paste a production payload, a customer record or an API key into any of them and it never reaches a server. Hashing uses the browser's Web Crypto implementation, so SHA-1, SHA-256, SHA-384 and SHA-512 are the real algorithms. MD5 is not available in Web Crypto and the page says so instead of silently substituting.
Conventions
- Formatters follow the common style for each language. A specific toolchain (Prettier, Black, gofmt) may differ in small ways.
- The JSON tools are strict RFC 8259. Trailing commas, comments and single quotes are reported as errors, which is what your parser will do too.
- Very large inputs are bounded by your browser's memory rather than an upload quota.
The editor-style tools accept drag-and-drop and keyboard paste, and every code output has a copy button.
The newer additions lean towards code generation and checking: turn a sample into TypeScript interfaces (or the same shapes as Java, C#, Go, Rust, Python, Kotlin, Dart or Swift types) or a JSON Schema and then validate data against it, convert JSON to YAML or flatten it for a spreadsheet, translate a curl command into fetch, Python or Go or build one from scratch, test an XPath or CSS selector against real markup, convert HTML to JSX, make a Markdown table or SQL inserts from CSV, work out chmod permissions, check semver ranges, parse a URL, generate a .gitignore, inspect Unicode code points and mint ULIDs.