JSON Lines Converter
Convert JSON arrays to JSON Lines (JSONL/NDJSON) and back with line-specific errors
FREE DEVELOPER TOOLS / 73 tools
Here Be Tools
Format JSON, compare lists, convert files, and inspect tokens. Processing runs in your browser.
↳ Processing in your browserNo account required
Common tasks
Compare Two Lists
Find matches, differences, and unique items across two lists
Query String Builder
Build and edit URL query parameters with encoding and duplicate-key support
JSON Compare
Diff two JSON documents side by side
JSON Formatter
Format, validate, minify and sort JSON with tree view
JSON Schema
Validate JSON against a JSON Schema
JSON → TypeScript
Generate TypeScript interfaces from a JSON sample
JSON → Zod
Generate a Zod validation schema from JSON
JSONPath Tester
Test JSONPath expressions against JSON
Bytes / Units
Convert between SI and binary storage units
CSV ↔ JSON
Convert between CSV and JSON with type detection
JSON → CSV
Flatten JSON arrays into CSV with configurable delimiters and headers
JSON → XML
Convert JSON objects to formatted XML and parse XML back to JSON
JSON → YAML
Convert JSON to YAML format and parse YAML back to JSON with live preview
Markdown → HTML
Convert Markdown to clean HTML output
TOML ↔ JSON
Convert TOML configuration files to JSON and back with validation
Base64
Encode and decode Base64 strings and files
Escape / Unescape
Escape and unescape HTML, JS, JSON, and URL strings
URL Encode
Percent-encode and decode URLs and query strings
Email Validator
Validate email address syntax and inspect components
IP Inspector
Inspect IPv4/IPv6 addresses, class, CIDR range
JWT Expiry
Check JWT expiry, iat, and nbf time claims
Semver
Validate and compare semantic version strings
URL Inspector
Parse and inspect URL components and query params
YAML Validator
Validate YAML syntax and inspect parsed structure
Case Converter
Convert text to camelCase, snake_case, kebab-case and more
Line Tools
Sort, deduplicate, number, shuffle, and filter lines
Slug Generator
Convert text to URL slugs, variable names, and identifiers
String Inspector
Analyze text: bytes, entropy, frequency, encoding detection
Text Diff
Compare two text blocks line by line
Word Counter
Count words, chars, sentences and check reading ease
HTML Formatter
Format and minify HTML, JS, and CSS
Markdown Preview
Live markdown editor with rendered HTML preview
Markdown Table
Visual markdown table builder with CSV import
SOAP Formatter
Format and validate SOAP envelopes
XML Formatter
Format and validate XML, test XPath expressions
Chmod Calculator
Build Unix file permission masks visually
Cron Parser
Parse cron expressions to plain English
GraphQL Formatter
Format, minify and analyze GraphQL queries
Hash Generator
Generate SHA-1/256/384/512 hashes
JS Playground
Run and lint JavaScript in the browser with live console output
Number Base
Convert between decimal, hex, binary, octal
PEM Decoder
Decode X.509 certificates from PEM format
Regex Tester
Test and debug regular expressions
Robots.txt
Generate and analyze robots.txt files
SQL Formatter
Format and beautify SQL queries
Timestamp
Convert Unix timestamps to human-readable dates with timezone support
Unicode Inspector
Analyze Unicode characters and code points
UUID Generator
Generate v4 UUIDs in bulk and copy them instantly
Cookie Parser
Parse and analyze Set-Cookie and Cookie headers
cURL Converter
Convert cURL to fetch, axios, or Python
.env Parser
Parse .env files with type detection and export options
Email Auth Tools
Generate and analyze SPF and DMARC DNS records for email authentication
Email Headers
Parse and analyze raw email headers, authentication results and routing
HTTP Headers
Analyze HTTP response headers with security scoring
HTTP Status Codes
Complete reference for all HTTP status codes
JWT Decoder
Decode and inspect JWT tokens
JWT Builder
Build and sign JWT tokens in the browser
User Agent Parser
Detect browser, OS and device from User Agent strings
Color Converter
Convert between HEX, RGB, HSL, HSV, CSS
CSV Tools
Validate, reformat, and compare CSV files — delimiter, qualifier, sort, diff
CSV Viewer
Render CSV as a sortable, filterable table
Image → Base64
Convert images to Base64/Data URIs — file never leaves your browser
JS / CSS Minifier
Minify and compress JavaScript and CSS to reduce bundle size
Lorem Ipsum
Generate lorem ipsum placeholder text
Password Generator
Generate strong passphrases (XKCD/NIST) or traditional passwords
HTML Reference
Quick reference for HTML elements, attributes and semantic structure
CSS Reference
Quick reference for CSS selectors, flexbox, grid, and properties
JavaScript Reference
Quick reference for JavaScript syntax, arrays, async and ES2022+
PHP Reference
Quick reference for PHP syntax, functions, OOP and superglobals
Python Reference
Quick reference for Python syntax, data types, comprehensions and stdlib
PowerShell Reference
Quick reference for PowerShell cmdlets, pipeline and scripting patterns
Bootstrap Reference
Quick reference for Bootstrap 5 grid, utilities, components and classes