JSON Formatter & Beautifier
Format JSON online into readable indentation, validate syntax and make API responses easier to debug.
All FormatKit tools and guides
A crawlable overview for users and search engines: popular tools first, then categories, every tool page and practical guides.
Priority tools
High-intent utilities for international search traffic
JSON Validator & Syntax Checker
Validate JSON online, check syntax errors and find the line that breaks an API payload, config file or JSON object.
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 online for tokens, headers, data URLs and development snippets.
URL Encoder / Decoder
Encode text for URLs or decode percent-encoded query strings and parameters.
JWT Decoder & Token Inspector
Decode JWT header and payload online to inspect claims, expiration values and token structure.
Hash Generator
Generate SHA-1, SHA-256 and SHA-512 hashes from text using the browser crypto API.
Password Generator
Create strong random passwords with length and character set controls.
Unix Timestamp Converter
Convert Unix timestamps to readable dates and convert dates back to Unix time.
Word & Character Counter
Count words, characters, sentences, paragraphs and estimated reading time.
JSON to CSV Converter
Convert an array of JSON objects into a readable CSV table.
CSV to JSON Converter
Convert CSV rows into a JSON array using the first row as field names.
Text Cleaner
Trim text, normalize spacing and remove repeated blank lines from pasted content.
Meta Tag Generator
Generate basic SEO and Open Graph meta tags for a web page.
XML Formatter
Format compact XML into readable indented markup and check for obvious structure errors.
SQL Formatter
Make SQL queries easier to read by adding practical line breaks around common clauses.
Cron Expression Explainer
Explain common five-part cron expressions in plain English.
UTM Link Builder
Build campaign URLs with UTM source, medium, campaign, term and content parameters.
JSON Escape / Unescape
Escape text for a JSON string or turn an escaped JSON string back into readable text.
Text / Binary Converter
Convert Unicode text to eight-bit binary bytes or decode binary bytes back to text.
HMAC Generator
Generate an HMAC signature with SHA-256, SHA-384 or SHA-512 using the Web Crypto API.
HTTP Status Code Lookup
Look up the meaning and practical category of common HTTP response status codes.
CSS Unit Converter
Convert values between pixels, rem and em with a configurable base font size.
Text Statistics Analyzer
Analyze words, sentences, paragraphs, reading time, average lengths and repeated terms.
Priority guides
Supporting pages that explain common tool workflows
How to Format JSON Without Breaking the Data
A practical guide to reading, formatting and checking JSON from APIs, logs and configuration files.
JSON to CSV: When It Works Well and When It Gets Messy
Understand the best JSON shape for CSV conversion and how nested values are handled.
Base64 Encoding Explained for Everyday Debugging
Learn what Base64 is, what it is not, and where it commonly appears in web development.
How to Decode a JWT and Read Its Claims
Decode JWT header and payload sections, understand common claims and avoid a common security mistake.
How to Generate Strong Passwords for Real Accounts
A simple guide to password length, character sets and safe handling of generated passwords.
URL Encoding: Spaces, Symbols and Query Parameters
Understand percent encoding and when to encode a full URL versus a single parameter value.
Regex Testing Basics for JavaScript Patterns
Learn how to test regular expressions, use flags and avoid common pattern surprises.
Word Count, Character Count and Reading Time for Web Content
Use text statistics to check drafts, meta descriptions, support replies and short content.
Tool categories
Browse tools by task type
JSON Tools
6 tools
JSON Formatter & Beautifier
Format JSON online into readable indentation, validate syntax and make API responses easier to debug.
JSON Validator & Syntax Checker
Validate JSON online, check syntax errors and find the line that breaks an API payload, config file or JSON object.
JSON Minifier
Remove whitespace from JSON after validating that the input can be parsed safely.
JSON to CSV Converter
Convert an array of JSON objects into a readable CSV table.
CSV to JSON Converter
Convert CSV rows into a JSON array using the first row as field names.
JSON Escape / Unescape
Escape text for a JSON string or turn an escaped JSON string back into readable text.
Encoders & Decoders
6 tools
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 online for tokens, headers, data URLs and development snippets.
URL Encoder / Decoder
Encode text for URLs or decode percent-encoded query strings and parameters.
HTML Entity Encoder / Decoder
Convert HTML-sensitive characters to entities or decode entities back to normal text.
Query String Parser
Parse URL query strings into decoded key and value pairs.
URL Parser
Break a URL into protocol, host, path, query and hash sections.
Text / Binary Converter
Convert Unicode text to eight-bit binary bytes or decode binary bytes back to text.
Developer Tools
11 tools
JWT Decoder & Token Inspector
Decode JWT header and payload online to inspect claims, expiration values and token structure.
Hash Generator
Generate SHA-1, SHA-256 and SHA-512 hashes from text using the browser crypto API.
Unix Timestamp Converter
Convert Unix timestamps to readable dates and convert dates back to Unix time.
Regex Tester
Test JavaScript regular expressions against sample text and inspect matches.
Regex Escape Tool
Escape special characters so literal text can be used safely inside a regular expression.
Number Base Converter
Convert numbers between decimal, binary, octal and hexadecimal.
File Size Converter
Convert bytes, KB, MB and GB into related file size units.
SQL Formatter
Make SQL queries easier to read by adding practical line breaks around common clauses.
Cron Expression Explainer
Explain common five-part cron expressions in plain English.
HMAC Generator
Generate an HMAC signature with SHA-256, SHA-384 or SHA-512 using the Web Crypto API.
CSV Delimiter Converter
Convert CSV data between comma, semicolon, tab and pipe delimiters while preserving quoted fields.
Generators
6 tools
Password Generator
Create strong random passwords with length and character set controls.
UUID Generator
Generate random UUID values for test data, records and development placeholders.
Lorem Ipsum Generator
Generate placeholder paragraphs for layouts, drafts and UI mockups.
Random String Generator
Generate random strings for test data, identifiers and temporary tokens.
Random Number Generator
Generate random numbers within a range for tests, samples and quick decisions.
Date Difference Calculator
Calculate the calendar and elapsed-time difference between two dates.
Text Tools
10 tools
Word & Character Counter
Count words, characters, sentences, paragraphs and estimated reading time.
Case Converter
Convert text to uppercase, lowercase, title case, sentence case and alternating case.
Slug Generator
Turn titles into clean URL slugs for blog posts, docs and product pages.
Text Diff Checker
Compare two text blocks line by line and see additions, removals and changes.
Markdown Preview
Preview basic Markdown headings, lists, links and code blocks as HTML.
Line Sorter
Sort lines alphabetically, reverse order and optionally remove empty lines.
Duplicate Line Remover
Remove repeated lines while keeping the first occurrence in place.
Text Cleaner
Trim text, normalize spacing and remove repeated blank lines from pasted content.
Text Reverser
Reverse characters, words or line order for quick text experiments.
Text Statistics Analyzer
Analyze words, sentences, paragraphs, reading time, average lengths and repeated terms.
Web Tools
11 tools
Color Converter HEX RGB HSL
Convert HEX, RGB and HSL colors online with a live swatch for CSS and design handoff work.
CSS Minifier & Compressor
Minify CSS online by removing comments and extra whitespace from stylesheets and small snippets.
JavaScript Minifier
Compact simple JavaScript snippets by removing comments and extra whitespace.
HTML Formatter
Indent simple HTML so nested elements are easier to scan and edit.
HTML to Markdown Converter
Convert simple HTML snippets into readable Markdown.
Meta Tag Generator
Generate basic SEO and Open Graph meta tags for a web page.
XML Formatter
Format compact XML into readable indented markup and check for obvious structure errors.
Robots.txt Generator & Sitemap Helper
Generate a robots.txt file online with user-agent rules, disallow paths and sitemap references.
UTM Link Builder
Build campaign URLs with UTM source, medium, campaign, term and content parameters.
HTTP Status Code Lookup
Look up the meaning and practical category of common HTTP response status codes.
CSS Unit Converter
Convert values between pixels, rem and em with a configurable base font size.
Extraction Tools
58 tools
Email Address Extractor
Extract email addresses from pasted text and return a clean, deduplicated list.
Email Domain Extractor
Extract email domains from pasted text, logs or contact lists and return a clean deduplicated domain list.
URL Extractor
Extract URLs from pasted text and return a clean, deduplicated list.
Domain Extractor
Extract domains from pasted text and return a clean, deduplicated list.
Image URL Extractor
Extract image URLs from pasted text and return a clean, deduplicated list.
IPv4 Address Extractor
Extract IPv4 addresses from pasted text and return a clean, deduplicated list.
IPv6 Address Extractor
Extract IPv6 addresses from pasted text and return a clean, deduplicated list.
UUID Extractor
Extract UUID values from pasted text and return a clean, deduplicated list.
HEX Color Extractor
Extract HEX colors from pasted text and return a clean, deduplicated list.
CSS Variable Extractor
Extract CSS custom properties from pasted text and return a clean, deduplicated list.
CSS Class Selector Extractor
Extract CSS class selectors from pasted text and return a clean, deduplicated list.
CSS ID Selector Extractor
Extract CSS ID selectors from pasted text and return a clean, deduplicated list.
HTML Tag Extractor
Extract HTML tag names from pasted text and return a clean, deduplicated list.
HTML Comment Extractor
Extract HTML comments from pasted text and return a clean, deduplicated list.
Markdown Link Extractor
Extract Markdown links from pasted text and return a clean, deduplicated list.
Markdown URL Extractor
Extract Markdown link URLs from pasted text and return a clean, deduplicated list.
Markdown Heading Extractor
Extract Markdown headings from pasted text and return a clean, deduplicated list.
Markdown Bold Text Extractor
Extract bold Markdown text from pasted text and return a clean, deduplicated list.
Inline Code Extractor
Extract inline code snippets from pasted text and return a clean, deduplicated list.
Hashtag Extractor
Extract hashtags from pasted text and return a clean, deduplicated list.
Social Handle Extractor
Extract social handles from pasted text and return a clean, deduplicated list.
Phone Number Extractor
Extract phone-like numbers from pasted text and return a clean, deduplicated list.
Currency Amount Extractor
Extract currency amounts from pasted text and return a clean, deduplicated list.
Percentage Extractor
Extract percentages from pasted text and return a clean, deduplicated list.
Decimal Number Extractor
Extract decimal numbers from pasted text and return a clean, deduplicated list.
Integer Extractor
Extract integers from pasted text and return a clean, deduplicated list.
ISO Date Extractor
Extract ISO dates from pasted text and return a clean, deduplicated list.
Slash Date Extractor
Extract slash dates from pasted text and return a clean, deduplicated list.
Time Extractor
Extract times from pasted text and return a clean, deduplicated list.
ISO Timestamp Extractor
Extract ISO timestamps from pasted text and return a clean, deduplicated list.
Semantic Version Extractor
Extract semantic versions from pasted text and return a clean, deduplicated list.
Issue Key Extractor
Extract issue keys from pasted text and return a clean, deduplicated list.
MD5 Hash Extractor
Extract MD5 hashes from pasted text and return a clean, deduplicated list.
SHA-256 Hash Extractor
Extract SHA-256 hashes from pasted text and return a clean, deduplicated list.
Base64 String Extractor
Extract Base64-like strings from pasted text and return a clean, deduplicated list.
Quoted String Extractor
Extract double-quoted strings from pasted text and return a clean, deduplicated list.
Single Quoted String Extractor
Extract single-quoted strings from pasted text and return a clean, deduplicated list.
Parentheses Text Extractor
Extract text in parentheses from pasted text and return a clean, deduplicated list.
Bracket Text Extractor
Extract text in square brackets from pasted text and return a clean, deduplicated list.
JSON Key Extractor
Extract JSON-style keys from pasted text and return a clean, deduplicated list.
Key Value Pair Extractor
Extract key=value pairs from pasted text and return a clean, deduplicated list.
Environment Variable Name Extractor
Extract environment variable names from pasted text and return a clean, deduplicated list.
Windows Path Extractor
Extract Windows paths from pasted text and return a clean, deduplicated list.
Unix Path Extractor
Extract Unix-style paths from pasted text and return a clean, deduplicated list.
File Extension Extractor
Extract file extensions from pasted text and return a clean, deduplicated list.
Filename Extractor
Extract file names from pasted text and return a clean, deduplicated list.
NPM Package Name Extractor
Extract package names from pasted text and return a clean, deduplicated list.
Docker Image Tag Extractor
Extract Docker image tags from pasted text and return a clean, deduplicated list.
Capitalized Word Extractor
Extract capitalized words from pasted text and return a clean, deduplicated list.
Uppercase Word Extractor
Extract uppercase words from pasted text and return a clean, deduplicated list.
Long Word Extractor
Extract long words from pasted text and return a clean, deduplicated list.
TODO Line Extractor
Extract TODO lines from pasted text and return a clean, deduplicated list.
Error Line Extractor
Extract error lines from pasted text and return a clean, deduplicated list.
Warning Line Extractor
Extract warning lines from pasted text and return a clean, deduplicated list.
SQL Keyword Extractor
Extract SQL keywords from pasted text and return a clean, deduplicated list.
URL Protocol Extractor
Extract URL protocols from pasted text and return a clean, deduplicated list.
Port Number Extractor
Extract port numbers from pasted text and return a clean, deduplicated list.
HTML Attribute Extractor
Extract HTML attribute names from pasted text and return a clean, deduplicated list.
Cleanup Tools
35 tools
HTML Tag Remover
Remove HTML tags from pasted text while keeping the rest of the content editable.
Markdown Formatting Remover
Remove Markdown emphasis markers from pasted text while keeping the rest of the content editable.
URL Remover
Remove URLs from pasted text while keeping the rest of the content editable.
Email Address Remover
Remove email addresses from pasted text while keeping the rest of the content editable.
Number Remover
Remove numbers from pasted text while keeping the rest of the content editable.
Punctuation Remover
Remove punctuation from pasted text while keeping the rest of the content editable.
Emoji Remover
Remove emoji-like symbols from pasted text while keeping the rest of the content editable.
Extra Space Remover
Remove extra spaces from pasted text while keeping the rest of the content editable.
Blank Line Remover
Remove extra blank lines from pasted text while keeping the rest of the content editable.
Tab Remover
Remove tab characters from pasted text while keeping the rest of the content editable.
Carriage Return Remover
Remove carriage returns from pasted text while keeping the rest of the content editable.
HTML Comment Remover
Remove HTML comments from pasted text while keeping the rest of the content editable.
CSS Comment Remover
Remove CSS comments from pasted text while keeping the rest of the content editable.
JavaScript Line Comment Remover
Remove JavaScript line comments from pasted text while keeping the rest of the content editable.
Bracket Remover
Remove brackets from pasted text while keeping the rest of the content editable.
Quote Remover
Remove quote characters from pasted text while keeping the rest of the content editable.
Hashtag Remover
Remove hashtags from pasted text while keeping the rest of the content editable.
Social Handle Remover
Remove social handles from pasted text while keeping the rest of the content editable.
Currency Symbol Remover
Remove currency symbols from pasted text while keeping the rest of the content editable.
Accent Remover
Remove accents and diacritics from text for simple ASCII-style matching.
Duplicate Word Remover
Remove repeated adjacent words from pasted text while keeping the rest of the content editable.
Leading Space Remover
Remove leading spaces from pasted text while keeping the rest of the content editable.
Trailing Space Remover
Remove trailing spaces from pasted text while keeping the rest of the content editable.
Non-ASCII Character Remover
Remove non-ASCII characters from pasted text while keeping the rest of the content editable.
Control Character Remover
Remove control characters from pasted text while keeping the rest of the content editable.
XML Tag Remover
Remove XML tags from pasted text while keeping the rest of the content editable.
UTM Parameter Remover
Remove UTM query parameters from pasted text while keeping the rest of the content editable.
Query String Remover
Remove URL query strings from pasted text while keeping the rest of the content editable.
URL Hash Fragment Remover
Remove URL hash fragments from pasted text while keeping the rest of the content editable.
Line Number Remover
Remove leading line numbers from pasted text while keeping the rest of the content editable.
Bullet Marker Remover
Remove bullet markers from pasted text while keeping the rest of the content editable.
HTML Entity Remover
Remove HTML entities from pasted text while keeping the rest of the content editable.
Multiple Comma Remover
Remove repeated commas from pasted text while keeping the rest of the content editable.
Multiple Dot Remover
Remove repeated dots from pasted text while keeping the rest of the content editable.
Slash Remover
Remove slashes from pasted text while keeping the rest of the content editable.
Line Tools
5 tools
Line Trimmer
Trim whitespace from the start and end of every line.
Line Lowercase Converter
Convert every line to lowercase while keeping line breaks.
Line Uppercase Converter
Convert every line to uppercase while keeping line breaks.
Line Title Case Converter
Convert each line to title case for headings and lists.
Line Slug Generator
Turn every line into a lowercase URL slug.
All guides
Short explanations for everyday text, code and data workflows
How to Format JSON Without Breaking the Data
A practical guide to reading, formatting and checking JSON from APIs, logs and configuration files.
JSON to CSV: When It Works Well and When It Gets Messy
Understand the best JSON shape for CSV conversion and how nested values are handled.
Base64 Encoding Explained for Everyday Debugging
Learn what Base64 is, what it is not, and where it commonly appears in web development.
How to Decode a JWT and Read Its Claims
Decode JWT header and payload sections, understand common claims and avoid a common security mistake.
How to Generate Strong Passwords for Real Accounts
A simple guide to password length, character sets and safe handling of generated passwords.
URL Encoding: Spaces, Symbols and Query Parameters
Understand percent encoding and when to encode a full URL versus a single parameter value.
Regex Testing Basics for JavaScript Patterns
Learn how to test regular expressions, use flags and avoid common pattern surprises.
Word Count, Character Count and Reading Time for Web Content
Use text statistics to check drafts, meta descriptions, support replies and short content.
Meta Tags for SEO and Social Sharing
Create clean title, description, canonical and Open Graph tags for a web page.
A Practical Workflow for Cleaning Pasted Text
Normalize spacing, remove repeated blank lines and prepare copied text for editing.
Cron Expression Basics: Read a Schedule Before You Use It
Understand the five common cron fields and avoid scheduling mistakes in jobs and automations.
Robots.txt Basics for Small Websites
Learn what robots.txt can do, what it cannot protect and why sitemap lines are useful.
UTM Link Tracking: Keep Campaign Reports Clean
Use consistent UTM source, medium and campaign values so analytics reports stay readable.
JSON String Escaping: Quotes, New Lines and Backslashes
Learn why JSON strings need escaping and how to avoid double-escaping copied values.
HMAC Signatures Explained for API and Webhook Testing
Understand how a message, secret and hash algorithm combine to create a verifiable signature.
CSV Delimiters and Quoted Fields: A Practical Guide
Convert comma, semicolon, tab and pipe data without breaking delimiters inside quoted cells.
HTTP Status Codes for Faster Website and API Debugging
Use status-code families to quickly separate success, redirect, client and server problems.
PX, REM and EM: Choosing CSS Units That Scale
Understand the difference between fixed and relative CSS units before converting design values.
How to Calculate Days Between Dates Without Off-by-One Errors
Separate elapsed time from inclusive calendar counting when measuring date ranges.
Text Statistics That Help During Editing
Use sentence length, word length and repeated terms to review a draft without reducing writing to one score.