Free Developer Tools
JSON, regex, encoding, hashing, formatting, and debugging tools that run entirely in your browser.
JSON Formatter
Pretty-print and validate JSON with syntax highlighting and tree view.
JSON Compare
Side-by-side JSON diff with added, removed, and changed key highlighting.
JSON Schema Generator
Generate a JSON Schema from any JSON data automatically.
JSON to CSV
Convert JSON arrays to CSV with custom delimiter and header extraction.
JSON to YAML
Convert JSON to YAML and back. Handles nested objects and arrays.
JSON to TypeScript
Generate TypeScript interfaces from JSON data automatically.
JSON to XML
Convert JSON to XML with proper formatting and indentation.
JSON Path Extractor
Extract specific data from JSON using JSONPath expressions.
JSON Tree Viewer
Visualize JSON data as an interactive collapsible tree structure.
SQL Formatter
Pretty-print and indent SQL queries with keyword highlighting.
XML Formatter
Format and validate XML with proper indentation.
YAML Formatter
Format, validate, and sort YAML configuration files.
HTML Minifier
Minify HTML to reduce file size by stripping whitespace and comments.
JS Minifier
Minify JavaScript by removing whitespace, comments, and shortening code.
Regex Tester
Test regular expressions with match highlighting, capture groups, and flag options.
Regex Library
Browse and use a collection of common regular expressions for validation and pattern matching.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for text or files.
JWT Decoder
Decode JWT tokens to inspect header, payload, and expiration details.
Base64 Encoder
Encode and decode Base64 text instantly.
Base64 File Encoder
Convert any file to a Base64 data URL for embedding in HTML, CSS, or JavaScript.
UUID Generator
Generate v4 UUIDs individually or in bulk with copy support.
Text Encrypt/Decrypt
Encrypt and decrypt text using AES-256-GCM with a password.
Cron Expression Generator
Build cron expressions with visual dropdowns and preview next run times.
Cron Expression Explainer
Paste a cron expression and get a plain-English explanation with next 10 runs.
Chmod Calculator
Calculate Unix file permissions from octal to symbolic notation.
IP Subnet Calculator
Calculate subnet masks, network addresses, broadcast, and host ranges.
DNS Lookup
Look up DNS records (A, AAAA, CNAME, MX, TXT, NS, SOA, PTR) via Cloudflare DoH.
HTTP Status Codes
Complete reference of HTTP response codes with explanations and use cases.
Diff Checker
Compare two texts side by side and see insertions, deletions, and changes.
Robots.txt Generator
Generate robots.txt directives for search engine crawlers.
Meta Tag Generator
Generate HTML meta tags for SEO, Open Graph, and Twitter Cards.
OG Preview
Preview how your link will look when shared on Facebook, Twitter, and Slack.
CSS Formatter
Pretty-print and format CSS with proper indentation and syntax highlighting.
CSS to JS Object
Convert CSS to JavaScript object notation for CSS-in-JS libraries.
HTML Formatter
Format and beautify HTML code with proper indentation and spacing.
HTML Preview
Write HTML and see live preview as you code.
HTML Entity Encoder
Encode and decode HTML entities for special characters.
HTML Table Generator
Create and format HTML tables with visual editor.
HTML to JSX
Convert HTML to JSX with className attributes and camelCase properties.
HTML to Markdown
Convert HTML documents to clean Markdown syntax.
JSON String Escape
Escape and unescape JSON strings with special character handling.
JSON to Go Struct
Convert JSON to Go struct definitions automatically.
JSON Validator
Validate JSON and identify syntax errors with detailed messages.
CSV to JSON
Convert CSV files to JSON format with header detection.
XML to JSON
Convert XML to JSON with proper structure and formatting.
XML to CSV
Convert XML data to CSV format with custom delimiters.
SQL to JSON
Convert SQL query results to JSON format.
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal.
Bitwise Calculator
Perform bitwise operations (AND, OR, XOR, NOT, shifts) on numbers.
Epoch Converter
Convert between Unix timestamps and human-readable dates.
Timestamp Generator
Generate current Unix timestamp in seconds or milliseconds.
File Hash Generator
Calculate MD5, SHA-1, SHA-256, and SHA-512 hashes for files.
String Hash Generator
Generate various hash functions (MD5, SHA-1, SHA-256, etc.) for strings.
JWT Generator
Generate JWT tokens with custom claims and signing keys.
Keycode Finder
Press any key to see its keyCode, charCode, and key properties.
URL Parser
Parse and analyze URLs to extract protocol, domain, path, query parameters, and fragments.
URL Builder
Build URLs by setting domain, path, and query parameters visually.
URL Encoder/Decoder
Encode and decode URLs and query parameters.
.htaccess Generator
Generate .htaccess directives for redirects, rewrites, and security.
Character Map
Find and copy Unicode characters.
Regex Cheatsheet
Quick reference guide for regular expressions.
SVG Viewer
View and inspect SVG files.
YAML to JSON
Convert YAML to JSON format.
About Our Developer Tools
Absolutool offers 28 developer-focused utilities built for speed and privacy. JSON tools cover formatting, comparison, schema generation, path finding, and conversion to CSV, YAML, TypeScript, and XML. Use the regex tester, hash generator, JWT decoder, Base64 encoder, and UUID generator for everyday dev tasks.
Need to schedule jobs? Build expressions with the cron generator or reverse-engineer existing ones with the cron explainer. Format SQL, HTML, JS, XML, YAML, and CSS in seconds. Calculate Unix permissions, plan IP subnets, and look up DNS records · all without leaving your browser or sending data to a server.