Developer Tools

132 tools live — more coming soon

Developer tools on TheToolss speed up everyday coding chores: format and validate JSON, convert YAML, encode Base64 or URLs, generate UUIDs, decode JWTs, and test regex. Paste a snippet, copy the output, and stay in flow without installing extra CLI utilities — free and private in the browser.

Docker Run to Docker Compose Converter

Transform docker run command lines into clean, production-ready docker-compose.yml service definitions.

Git Commit Message Generator

Build standardized Conventional Commits with scopes, breaking changes, and terminal command generation.

HTTP Status Code Lookup

Instant lookup and explanations for all HTTP status codes (1xx to 5xx) with RFC references and troubleshooting.

SQL CREATE TABLE DDL Generator

Design relational database schemas and generate valid CREATE TABLE DDL scripts for PostgreSQL, MySQL, and SQLite.

Regex Cheatsheet & Interactive Tester

Test regular expressions in real-time with capture group extraction, flags support, and an interactive syntax cheatsheet.

JSON to Markdown Table Converter

Instantly convert an array of JSON objects into formatted GitHub-flavored Markdown tables.

JSON to XML Converter

Transform nested JSON objects and arrays into structured, indented XML markup with custom root tags.

XML to JSON Converter

Parse standard XML documents into formatted JSON objects with automatic type coercion and tag extraction.

DNS Zone Record Generator

Generate standard RFC BIND zone records for A, AAAA, CNAME, MX, TXT, SPF, DKIM, and DMARC configurations.

Apache .htaccess Redirect Generator

Generate 301 permanent redirects, force HTTPS SSL, handle www canonicalization, and clean URL rewrites in .htaccess.

Systemd Service Unit Generator

Generate Linux systemd .service unit configuration files for background daemons, Node.js, Python, or Go apps.

Chmod Linux Permissions Calculator

Visual chmod calculator for Linux file permissions with octal numbers, symbolic notation, and command generation.

Base64 File & Data URI Converter

Encode text or binary data into Base64 strings, or decode Base64 strings back to clean text and data URIs.

Crontab Guru Schedule Parser

Translate crontab cron expressions into human-readable English explanations with upcoming simulated trigger dates.

Hash & HMAC Cryptographic Generator

Generate secure SHA-256, SHA-384, SHA-512, and HMAC keyed hashes directly in the browser.

JSON Formatter

Pretty-print or minify JSON with validation.

JSON Validator

Validate JSON syntax and preview parsed structure.

JSON to CSV

Convert a JSON array of objects to CSV.

CSV to Markdown

Convert CSV to a Markdown table or one .md file per row — download MD or ZIP.

Base64 Encode/Decode

Encode or decode text using Base64.

URL Encoder/Decoder

Encode or decode URL components.

JWT Decoder

Decode JWT header and payload (no signature verification).

UUID Generator

Generate random UUID v4 identifiers.

Regex Tester

Test regular expressions against sample text.

XML Formatter

Basic XML indentation and validation.

YAML Converter

Convert between JSON and simple YAML.

CSV to JSON

Convert CSV tables to a JSON array of objects.

Code Minifier

Minify HTML, CSS, or JavaScript in one tool.

Code Diff Checker

Diff two code snippets line by line.

Cron Expression Generator

Build and explain 5-field cron expressions.

Hash Generator (MD5, SHA-256, SHA-512)

Generate MD5, SHA-1, SHA-256, and SHA-512 cryptographic hashes online.

Number Base Converter

Convert numbers between decimal, hex, octal, and binary.

HTML Entities Converter

Encode and decode HTML entities (named, decimal, hex) online free.

URL Parser & Query Builder

Parse, inspect, edit, and rebuild URLs and query parameters online free.

HTML Formatter & Beautifier

Format, beautify, indent, or minify HTML markup online free.

SQL Formatter

Format, beautify, and indent SQL queries with uppercase keywords online free.

JSON to TypeScript Converter

Convert JSON objects and API responses into clean TypeScript interfaces and types.

Chmod Permissions Calculator

Calculate and convert Linux/Unix file permissions (octal, symbolic, chmod command).

JSONPath Evaluator

Test and query JSON data using JSONPath expressions with instant results.

CSV to XML Converter

Convert CSV and TSV spreadsheet tables into structured XML markup online free.

XML to JSON Converter

Parse and convert XML markup and RSS feeds into structured JSON online free.

Caesar Cipher & ROT13

Encrypt and decrypt text with Caesar shift cipher (1-25) and ROT13 with brute-force table.

JSON Diff & Compare

Compare two JSON objects or API payloads side-by-side with visual difference highlights.

JSON to XML Converter

Convert JSON data or files to clean, formatted XML structure online.

TSV Converter (TSV to JSON, CSV & Markdown)

Convert TSV data to JSON, CSV, Markdown, and HTML tables online.

CSS Formatter

Format, beautify, and minify CSS code with custom indentation and spacing.

JSON to YAML Converter

Convert JSON data into clean, formatted YAML configurations online.

YAML to JSON Converter

Convert YAML configuration files into formatted JSON objects online.

.env Formatter & Cleaner

Format, alphabetize, validate, and convert .env environment variables to JSON or .env.example.

.gitignore Generator

Generate production-ready .gitignore files for Node.js, Python, Next.js, Go, Rust, and IDEs.

NanoID & Unique ID Generator

Generate collision-resistant, URL-friendly unique IDs with custom lengths and character sets.

Unicode Escape & Unescape

Encode text to \uXXXX, \u{XXXXX}, \xXX escape sequences or decode Unicode back to plain text.

HTTP Status Codes Reference

Interactive lookup and cheat sheet for HTTP status codes (1xx, 2xx, 3xx, 4xx, 5xx) with RFC definitions.

JSON to GraphQL Schema

Convert JSON objects into GraphQL schema type definitions instantly.

Fake Data Generator

Generate realistic fake test data — names, emails, addresses, and more as JSON or CSV.

CSS to Tailwind Converter

Convert standard CSS properties to equivalent Tailwind CSS utility classes.

API Tester

Test HTTP APIs with any method, headers, and body. A lightweight Postman alternative.

Git Repository Size Calculator

Analyze and visualize the size breakdown of a Git repository by file type and directory.

HTML to Image

Convert HTML/CSS to PNG or JPG images. Perfect for social media graphics and open graph images.

WebSocket Tester

Test WebSocket connections with a live message log and send interface.

Regex Visualizer

Visualize and break down regular expression patterns with explanations.

File Checksum Calculator

Calculate MD5, SHA-1, SHA-256, and SHA-512 checksums for any file to verify integrity.

GraphQL Formatter

Format and beautify GraphQL queries, mutations, and schemas with proper indentation.

JWT Encoder

Encode JWT tokens from header and payload JSON with optional secret signature.

Dockerfile Generator

Generate optimized Dockerfiles for Node.js, Python, Go, and more with best practices.

cURL to Fetch & Code Converter

Convert cURL commands to JavaScript fetch(), Axios, Python requests, and Node.js code.

SQL to JSON Converter

Convert SQL INSERT INTO queries, dumps, and tabular query results to JSON arrays online.

Meta Tags & OpenGraph Analyzer

Inspect and audit HTML meta tags, OpenGraph previews, Twitter cards, and SEO health score.

Base64 to PDF Converter & Viewer

Decode Base64 string into a downloadable PDF document with live in-browser preview.

Cron Expression Parser & Human Explainer

Translate any cron expression into plain English and calculate the next scheduled execution times.

Hex to ASCII & Text Converter

Convert Hexadecimal strings to ASCII text and plain text to Hex bytes with custom delimiters.

Markdown Table Generator

Interactive visual spreadsheet editor to create, format, and align clean Markdown tables.

Git Command Generator & Scenario Helper

Interactive Git command builder for common developer scenarios like undoing commits, rebasing, and stashing.

TSV to CSV Converter

Convert Tab-Separated Values (TSV) to Comma-Separated Values (CSV) with quote escaping options.

XML to CSV Converter

Convert structured XML records into clean, tabular Comma-Separated Values (CSV) spreadsheets.

ASCII to Hex Converter

Convert plain text strings to hexadecimal byte values and decode hex back to ASCII characters online.

Binary to Hex Converter

Convert binary numbers (base-2) to hexadecimal (base-16), decimal, and octal representations instantly.

User Agent Parser & Detector

Parse and inspect User Agent strings to detect Browser, Version, OS, Device Type, and Rendering Engine.

JavaScript KeyCode & Keyboard Event Tester

Press any key on your keyboard to instantly see its JavaScript event.key, event.code, keyCode, and modifier states.

IPv4 CIDR Subnet Calculator

Calculate IPv4 CIDR subnet ranges, usable host IPs, network and broadcast addresses, and netmasks online.

JSON Repair & Fixer

Automatically repair invalid JSON, fix trailing commas, unquoted keys, and single quotes.

MAC Address Generator & Formatter

Generate random MAC addresses with OUI vendor prefixes, custom separators, and case formatting.

SQL Minifier & Query Compressor

Compress and minify SQL queries by removing comments and collapsing whitespace while keeping strings safe.

SemVer Checker & Bump Calculator

Validate Semantic Versioning (SemVer 2.0.0), compare versions, test range matchers (^, ~), and calculate version bumps.

cURL to JSON Converter

Parse cURL commands into clean structured JSON with method, URL, query params, headers, and body payload.

CSV to SQL Converter

Convert CSV or TSV tabular data into SQL INSERT statements and CREATE TABLE definitions with automatic data types.

HTML Table Generator & Styler

Build styled HTML tables with custom rows, columns, headers, zebra stripes, and copy pure HTML or Tailwind markup.

Number Base Converter (Binary, Hex, Decimal)

Convert numbers between Binary, Octal, Decimal, Hexadecimal, and any custom base.

Cron Expression Generator & Explainer

Generate and translate 5-part cron expressions into plain English with next scheduled runs.

GraphQL Query Formatter & Minifier

Format, beautify, indent, and minify GraphQL queries, mutations, and fragments.

Docker Compose Stack Generator

Visually assemble and generate production-ready docker-compose.yml files for web apps, databases, and caches.

Nginx Configuration Generator

Generate secure, production-ready Nginx server block configs with SSL, reverse proxy, and caching.

JSON Schema Generator

Instantly generate standard JSON Schema Draft-07 & 2020-12 definitions from any JSON data.

TOML to JSON Converter

Parse and convert TOML configuration files (Cargo.toml, pyproject.toml) to formatted JSON.

JSON to TOML Converter

Convert JSON data into clean, human-readable TOML configuration format.

.env to JSON Converter & Formatter

Parse and convert multi-line .env environment variables into formatted JSON objects.

HTML Entity Decoder & Encoder

Encode special characters to HTML entities and decode named, decimal, and hex entities.

SVG Path Visualizer & Inspector

Inspect, visualize, and parse SVG path d=

Password Entropy & Strength Calculator

Calculate password cryptographic Shannon entropy bits, pool character size, and brute-force crack time.

IPv4 Subnet Mask & CIDR Calculator

Calculate usable host IP count, wildcards, and netmask octets from CIDR prefix length (/0 to /32).

JWT Expiration & Payload Inspector

Inspect JSON Web Token (JWT) expiration Unix timestamps and calculate hours until token expiry.

SQL IN Clause Formatter & Generator

Turn a list of IDs or strings into a SQL IN clause with quoting, escaping, de-duplication and batching.

camelCase / snake_case / kebab-case Converter

Convert identifiers between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and dot.case.

Cron Job Schedule Frequency Calculator

Calculate executions per day, per month, and interval seconds for standard 5-part crontab expressions.

HTML Table to CSV Dimensions Calculator

Estimate CSV file size and data matrix cells from parsed HTML tables with rows and columns.

Markdown Table to JSON Array Sizer

Calculate JSON object count, payload size, and token usage from markdown table rows.

SemVer Version Bump & Release Calculator

Calculate next Semantic Versioning (SemVer 2.0.0) numbers for major, minor, patch, and prerelease.

JSON Array Sort & Complexity Calculator

Calculate array sorting comparison operations (O(N log N)) and memory footprint for JSON data.

SEO URL Slug Length & Stopword Optimizer

Calculate URL slug character length, hyphen counts, and SERP truncation risk for clean permalinks.

CSV Column Trimmer & Size Reducer

Calculate file size reduction percentage when stripping unneeded columns from massive CSV datasets.

CRLF to LF Line Break Normalizer

Convert Windows CRLF line endings to Unix LF (or back), count mixed line breaks and add a final newline.

Binary Bit Stream Conversion Calculator

Calculate hexadecimal nibbles, octal digits, and UTF-8 byte lengths from raw binary bit streams.

UUIDv7 Timestamp & Collision Entropy Calculator

Calculate millisecond timestamp precision and 74-bit random entropy collision odds for UUID version 7.

QR Code Error Correction & Capacity Calculator

Calculate maximum character payload capacity and damage recovery percentage across L, M, Q, H QR levels.

Resistor Color Code Value Calculator

Decode standard 4-band resistor color codes into Ohms (Ω), kilo-Ohms (kΩ), and calculate minimum/maximum tolerance values.

LED Series Resistor & Wattage Calculator

Calculate exact series resistance (Ohms), standard E24 component value, and resistor power dissipation in Watts for LED circuits.

CSS Clamp Responsive Typography Generator

Generate responsive typography CSS clamp() formulas with dynamic viewport width (vw) interpolation between min and max screens.

CSS Grid Track & Column Builder

Calculate precise responsive CSS grid column widths, gap deductions, and maximum columns that fit container boundaries.

Base64 Data URI Payload Analyzer

Analyze base64 Data URI encoding transfer overhead (~33%), compute extra payload bytes, and determine HTTP cache break-even counts.

DNS TTL & Propagation Delay Calculator

Calculate DNS migration preparation lead time, residual resolver cache windows, and global propagation risk based on TTL records.

Git Commit Squash & History Optimizer

Calculate commit noise reduction percentages and determine interactive git rebase steps to maintain clean feature branch histories.

Cron Jitter & Thundering Herd Delay Calculator

Calculate randomized cron jitter delay spreads and peak database requests per second (RPS) to prevent server synchronization spikes.

Ohm's Law Voltage Current & Power Calculator

Solve Ohm’s law for current, resistance, and wattage from voltage and load resistance.

Three-Phase Power kW kVA Calculator

Calculate three-phase real power, apparent power, and reactive power from line voltage, current, and PF.

Transformer Turns Ratio & Voltage Calculator

Find transformer turns ratio, secondary turns, and secondary current from primary specs.

Capacitor Energy & RC Time Constant Calculator

Calculate stored capacitor energy in joules and the RC time constant for charge/discharge.

Inductive Reactance XL Calculator

Compute inductive reactance XL and AC voltage drop from inductance, frequency, and current.

Parallel & Series Resistor Network Calculator

Calculate equivalent total resistance, branch currents, and total circuit dissipation for parallel and series resistor combinations.

Voltage Divider Output & Load Calculator

Calculate output voltage Vout, divider ratio, quiescent current, and loaded output voltage under external load resistance.

555 Timer Astable Frequency & Duty Cycle Calculator

Calculate oscillation frequency (Hz), high/low period times (t1/t2), and duty cycle percentage for NE555 astable multivibrators.

Op-Amp Gain & Bandwidth Calculator

Calculate closed-loop inverting/non-inverting operational amplifier voltage gain (Av and dB) and maximum cutoff bandwidth from GBWP.

Stepper Motor Steps Per MM & Calibration Calculator

Calculate steps-per-millimeter (steps/mm) calibration values for 3D printer, CNC, and robotics lead screws and GT2 timing belts.
Developer Tools Online Free — JSON Base64 UUID | TheToolss