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120+ Free Online Developer Tools to Format, Encode, Decode, Generate, Validate, Convert and Speed up your Development Workflow.

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100% FreeAll tools are completely free to use.
Privacy FirstAll processing happens in your browser.
Always UpdatedRegularly updated with new tools.
Developer FirstBuilt for the developer community.
Works OfflineMany tools work without internet.

All Developer Tools

232 tools available as standalone root-level pages.

JSON Formatter

Format, beautify, validate, and inspect JSON with a fast split-pane editor.

JSON & Data jsonformatterbeautifier

JSON Validator

Validate JSON syntax and get readable error messages before shipping data.

JSON & Data jsonvalidatorlint

JSON Minifier

Compress JSON by removing whitespace while preserving valid structure.

JSON & Data jsonminifiercompress

JSON Diff

Compare two JSON documents and highlight structural changes.

JSON & Data jsondiffcompare

JSON Tree Viewer

Turn JSON into an expandable tree-style outline for easier inspection.

JSON & Data jsonviewertree

JSON Schema Validator

Check JSON against a lightweight schema outline and required keys.

JSON & Data jsonschemavalidation

JSON Path Explorer

Explore JSON paths and generate useful dot paths from nested data.

JSON & Data jsonpathexplorer

YAML to JSON

Convert YAML configs into clean, formatted JSON.

JSON & Data yamljsonconverter

JSON to YAML

Convert JSON objects into readable YAML for config files and docs.

JSON & Data jsonyamlconverter

CSV to JSON

Convert CSV tables into JSON arrays for APIs, imports, and testing.

JSON & Data csvjsonconverter

XML to JSON

Convert XML snippets into JSON for integrations and debugging.

JSON & Data xmljsonconverter

TOML Converter

Convert TOML-style config values into readable JSON.

JSON & Data tomljsonconfig

Markdown to HTML Converter

Convert Markdown syntax to clean semantic HTML instantly.

JSON & Data markdownhtmlconverter

Base64 Encode/Decode

Encode text to Base64 or decode Base64 back to readable content.

Encoding & Security base64encodingdecoder

URL Encode/Decode

Encode URLs safely or decode percent-encoded query strings.

Encoding & Security urlencodingdecoder

HTML Encode/Decode

Escape HTML entities or decode encoded HTML text.

Encoding & Security htmlencodingentities

JWT Decoder

Decode JWT headers and payloads without sending tokens to a server.

Encoding & Security jwtsecuritytoken

QR Generator

Generate QR codes for links, text, Wi-Fi details, and quick sharing.

Encoding & Security qrgeneratorsharing

SHA256 Generator

Generate SHA-256 hashes for strings and uploaded files.

Encoding & Security sha256hashsecurity

bcrypt Generator

Create bcrypt-style password hashes for testing and local development.

Encoding & Security bcryptpasswordsecurity

Password Generator

Create strong random passwords with developer-friendly controls.

Encoding & Security passwordgeneratorsecurity

Password Strength Checker

Estimate password strength with practical feedback and improvement tips.

Encoding & Security passwordstrengthsecurity

Text Compare

Compare two text blocks and spot changed lines quickly.

Text Utilities textdiffcompare

Regex Toolkit

Write a regular expression, paste real text, and see matches, groups, explanations, validation, and performance notes in one workspace.

Regex & Patterns regexpatternsgenerator

Word Counter

Count words, characters, sentences, paragraphs, and reading time.

Text Utilities textcounterwriting

Case Converter

Convert text to title case, camelCase, snake_case, kebab-case, and more.

Text Utilities textcaseconverter

CSS Minifier

Compress CSS by removing whitespace and comments while preserving functionality.

Text Utilities cssminifiercompress

JavaScript Minifier

Compress JS by removing whitespace and comments to reduce file size.

Text Utilities javascriptminifiercompress

Unicode Inspector

Inspect Unicode code points, characters, and invisible spacing issues.

Text Utilities unicodetextdebugging

Lorem Ipsum Generator

Generate placeholder copy for mockups, prototypes, and content testing.

Text Utilities textgeneratorplaceholder

cURL to Fetch

Convert cURL commands into JavaScript fetch snippets.

API & Backend curlfetchapi

cURL to Axios

Convert cURL examples into readable Axios request code.

API & Backend curlaxiosapi

HTTP Header Viewer

Parse and organize HTTP headers for debugging requests and responses.

API & Backend httpheadersapi

API Request Builder

Draft API requests and generate simple request snippets.

API & Backend apihttprequest

HTTP Status Explorer

Look up HTTP status codes with developer-focused explanations.

API & Backend httpstatusapi

HTTP Status Codes Reference

Interactive reference for all HTTP status codes from 1xx to 5xx with filter and search.

API & Backend httpstatus codesapi

Cron Generator

Generate common cron expressions for scheduled tasks.

DevOps & Cloud crondevopsschedule

Cron Parser

Explain cron expressions in readable human language.

DevOps & Cloud cronparserdevops

Env Generator

Generate .env examples from key-value pairs and config notes.

DevOps & Cloud envdotenvdevops

Kubernetes YAML Validator

Validate Kubernetes YAML structure for common manifest fields.

DevOps & Cloud kubernetesyamldevops

Docker Compose Viewer

Inspect docker-compose services, ports, volumes, and environment settings.

DevOps & Cloud dockercomposedevops

SQL Formatter

Format SQL queries for readability, reviews, and documentation.

Database sqlformatterdatabase

SQL Minifier

Minify SQL by collapsing extra whitespace for compact snippets.

Database sqlminifierdatabase

SQL Beautifier

Beautify messy SQL with readable line breaks and spacing.

Database sqlbeautifierdatabase

JSON to TypeScript

Generate TypeScript interfaces from sample JSON.

AI Dev Tools typescriptjsontypes

JSON to Java POJO

Generate Java POJO class outlines from JSON fields.

AI Dev Tools javajsongenerator

JSON to Go Struct

Generate Go struct definitions from JSON samples.

AI Dev Tools gojsongenerator

OpenAPI Type Generator

Generate type outlines from OpenAPI schema documents.

AI Dev Tools openapitypesapi

OpenAPI Viewer

Inspect OpenAPI paths, methods, schemas, and operations.

AI Dev Tools openapiswaggerapi

UUID Generator

Generate RFC 4122 UUIDs for databases, testing, and app development.

Generators uuidgeneratorid

NanoID Generator

Generate compact random IDs for URLs, records, and app state.

Generators nanoididgenerator

Slug Generator

Convert titles and text into URL-safe slugs.

Generators slugseourl

Fake Data Generator

Generate realistic sample users, emails, companies, and addresses.

Generators fake datageneratortesting

GraphQL Formatter

Format GraphQL queries Includes a browser-first workflow inspired by prettier (graphql plugin).

JSON & Data graphqlformatterjson & data

SVG Optimizer

Minify/optimize SVG code Includes a browser-first workflow inspired by svgo.

JSON & Data svgoptimizerjson & data

Environment Variables Analyzer

Parse, validate .env files Includes a browser-first workflow inspired by dotenv-parser.

JSON & Data environmentvariablesanalyzer

JSON to CSV

Convert JSON array to CSV Includes a browser-first workflow inspired by papaparse.

JSON & Data jsontocsv

YAML Validator

Validate YAML syntax Includes a browser-first workflow inspired by js-yaml.

JSON & Data yamlvalidatorjson & data

YAML Formatter

Format/beautify YAML Includes a browser-first workflow inspired by js-yaml.

JSON & Data yamlformatterjson & data

XML Formatter

Format/beautify XML Includes a browser-first workflow inspired by vkbeautify.

JSON & Data xmlformatterjson & data

JSON Schema Generator

Generate JSON Schema from sample data Includes a browser-first workflow inspired by json-schema-from-sample.

JSON & Data jsonschemagenerator

JSON Path Query

Query JSON with JSONPath expressions Includes a browser-first workflow inspired by jsonpath-plus.

JSON & Data jsonpathquery

Protobuf Viewer

Parse and inspect protobuf messages Includes a browser-first workflow inspired by protobuf.js.

JSON & Data protobufviewerjson & data

MessagePack Encoder/Decoder

Encode/decode MessagePack binary format Includes a browser-first workflow inspired by msgpack-lite.

JSON & Data messagepackencoderdecoder

BSON Converter

Convert to/from BSON format Includes a browser-first workflow inspired by bson.

JSON & Data bsonconverterjson & data

Apache Avro Viewer

Inspect Avro serialized data Includes a browser-first workflow inspired by avsc.

JSON & Data apacheavroviewer

EDN Formatter

Format Clojure EDN data Includes a browser-first workflow inspired by cljson.

JSON & Data ednformatterjson & data

HOCON Parser

Parse HOCON config format Includes a browser-first workflow inspired by hocon-parser.

JSON & Data hoconparserjson & data

JSON-LD Validator

Validate JSON-LD documents Includes a browser-first workflow inspired by jsonld.

JSON & Data jsonldvalidator

GraphQL Schema Viewer

Visualize GraphQL schema Includes a browser-first workflow inspired by graphql-js.

JSON & Data graphqlschemaviewer

JSON Merge Tool

Merge multiple JSON files Includes a browser-first workflow inspired by deep-merge.

JSON & Data jsonmergetool

Data Size Calculator

Estimate data structure size

JSON & Data datasizecalculator

HTML Minifier

Compress HTML Includes a browser-first workflow inspired by html-minifier.

Text Utilities htmlminifiertext utilities

Text Diff Viewer

Compare text files side-by-side Includes a browser-first workflow inspired by diff-match-patch.

Text Utilities textdiffviewer

Text Statistics

Word count, character analysis

Text Utilities textstatisticstext utilities

Markdown Linter

Lint Markdown files Includes a browser-first workflow inspired by markdownlint.

Text Utilities markdownlintertext utilities

Text Encoder/Decoder

Encode/decode with various encodings Includes a browser-first workflow inspired by iconv-lite.

Text Utilities textencoderdecoder

QR Code Scanner

Decode QR codes Includes a browser-first workflow inspired by jsQR.

Text Utilities qrcodescanner

Spell Checker

Check spelling in text Includes a browser-first workflow inspired by typo-js.

Text Utilities spellcheckertext utilities

Grammar Checker

Check grammar in text Includes a browser-first workflow inspired by language-tool-js.

Text Utilities grammarcheckertext utilities

Text Sentiment Analyzer

Analyze sentiment of text Includes a browser-first workflow inspired by natural (NLP).

Text Utilities textsentimentanalyzer

Language Detector

Detect language of text Includes a browser-first workflow inspired by franc.

Text Utilities languagedetectortext utilities

Text Summarizer

Summarize long text Includes a browser-first workflow inspired by natural.

Text Utilities textsummarizertext utilities

Plagiarism Checker

Check for duplicate text Includes a browser-first workflow inspired by None (would need API).

Text Utilities plagiarismcheckertext utilities

Code Beautifier

Format code (multi-language) Includes a browser-first workflow inspired by prettier.

Text Utilities codebeautifiertext utilities

Markdown Preview

Live preview Markdown Includes a browser-first workflow inspired by markdown-it.

Text Utilities markdownpreviewtext utilities

Table of Contents Generator

Generate TOC from Markdown Includes a browser-first workflow inspired by markdown-it.

Text Utilities tableofcontents

Text to Morse Code

Convert text to Morse

Text Utilities texttomorse

Morse Code to Text

Decode Morse code

Text Utilities morsecodeto

Text Reverse

Reverse text/strings

Text Utilities textreversetext utilities

Anagram Finder

Find anagrams

Text Utilities anagramfindertext utilities

Word Frequency Counter

Analyze word frequency Includes a browser-first workflow inspired by natural.

Text Utilities wordfrequencycounter

Unicode Character Searcher

Search/view Unicode characters Includes a browser-first workflow inspired by unicode-data.

Text Utilities unicodecharactersearcher

Base64 Encoder/Decoder

Encode/decode Base64

Encoding & Security base64encoderdecoder

URL Encoder/Decoder

Encode/decode URLs

Encoding & Security urlencoderdecoder

HTML Encoder/Decoder

Encode/decode HTML entities

Encoding & Security htmlencoderdecoder

Hex Encoder/Decoder

Convert to/from hexadecimal

Encoding & Security hexencoderdecoder

ROT13 Converter

Apply ROT13 cipher

Encoding & Security rot13converterencoding & security

Caesar Cipher

Apply Caesar cipher with key

Encoding & Security caesarcipherencoding & security

Vigenère Cipher

Apply Vigenère cipher

Encoding & Security vigenrecipher

Base32 Encoder/Decoder

Encode/decode Base32 Includes a browser-first workflow inspired by base32.js.

Encoding & Security base32encoderdecoder

Punycode Converter

Convert IDN domains Includes a browser-first workflow inspired by punycode.

Encoding & Security punycodeconverterencoding & security

MD5 Generator

Generate MD5 hashes Includes a browser-first workflow inspired by crypto-js.

Encoding & Security md5generatorencoding & security

SHA1 Generator

Generate SHA1 hashes Includes a browser-first workflow inspired by crypto-js.

Encoding & Security sha1generatorencoding & security

HMAC Generator

Generate HMAC hashes Includes a browser-first workflow inspired by crypto-js.

Encoding & Security hmacgeneratorencoding & security

RSA Key Pair Generator

Generate RSA key pairs Includes a browser-first workflow inspired by jsencrypt.

Encoding & Security rsakeypair

SSL Certificate Viewer

Inspect SSL certificates Includes a browser-first workflow inspired by pkijs.

Encoding & Security sslcertificateviewer

TOTP Generator

Generate TOTP codes (2FA) Includes a browser-first workflow inspired by speakeasy.

Encoding & Security totpgeneratorencoding & security

AES Encryption/Decryption

Encrypt/decrypt with AES Includes a browser-first workflow inspired by crypto-js.

Encoding & Security aesencryptiondecryption

Text Signature Generator

Sign text with private key Includes a browser-first workflow inspired by jsencrypt.

Encoding & Security textsignaturegenerator

Signature Verifier

Verify signed text Includes a browser-first workflow inspired by jsencrypt.

Encoding & Security signatureverifierencoding & security

2FA Code Generator

Generate 2FA codes Includes a browser-first workflow inspired by speakeasy.

Encoding & Security 2facodegenerator

QR Code with Contact

Generate vCard QR codes Includes a browser-first workflow inspired by qrcode.js.

Encoding & Security qrcodewith

Barcode Generator

Generate barcodes Includes a browser-first workflow inspired by jsbarcode.

Encoding & Security barcodegeneratorencoding & security

Barcode Scanner

Scan barcodes (webcam) Includes a browser-first workflow inspired by jsQR + webcam.

Encoding & Security barcodescannerencoding & security

Checksum Calculator

Calculate checksums Includes a browser-first workflow inspired by crc.

Encoding & Security checksumcalculatorencoding & security

CRC Generator

Generate CRC codes Includes a browser-first workflow inspired by crc.

Encoding & Security crcgeneratorencoding & security

PGP Key Generator

Generate PGP keys Includes a browser-first workflow inspired by openpgpjs.

Encoding & Security pgpkeygenerator

PGP Encrypt/Decrypt

Encrypt/decrypt with PGP Includes a browser-first workflow inspired by openpgpjs.

Encoding & Security pgpencryptdecrypt

Argon2 Password Hasher

Hash passwords with Argon2 Includes a browser-first workflow inspired by argon2-wasm.

Encoding & Security argon2passwordhasher

Scrypt Generator

Generate Scrypt hashes Includes a browser-first workflow inspired by scrypt-js.

Encoding & Security scryptgeneratorencoding & security

Certificate Chain Validator

Validate SSL cert chains Includes a browser-first workflow inspired by pkijs.

Encoding & Security certificatechainvalidator

REST API Tester

Test REST APIs with headers Includes a browser-first workflow inspired by axios or fetch.

API & Backend restapitester

Request Header Builder

Build HTTP request headers

API & Backend requestheaderbuilder

GraphQL Query Tester

Test GraphQL queries Includes a browser-first workflow inspired by graphql-js.

API & Backend graphqlquerytester

WebSocket Tester

Test WebSocket connections Includes a browser-first workflow inspired by None required (native).

API & Backend websockettesterapi & backend

URL Shortener Generator

Generate short URLs Includes a browser-first workflow inspired by tinyurl-api (external).

API & Backend urlshortenergenerator

GraphQL Schema Formatter

Format GraphQL schemas Includes a browser-first workflow inspired by prettier.

API & Backend graphqlschemaformatter

REST to GraphQL Converter

Convert REST API to GraphQL Includes a browser-first workflow inspired by graphql-js.

API & Backend resttographql

SOAP/XML Web Service Tester

Test SOAP services Includes a browser-first workflow inspired by soap.

API & Backend soapxmlweb

Rate Limiter Calculator

Calculate rate limit impacts

API & Backend ratelimitercalculator

API Response Validator

Validate API responses Includes a browser-first workflow inspired by json-schema-validator.

API & Backend apiresponsevalidator

Mock API Generator

Generate mock API responses Includes a browser-first workflow inspired by faker.js.

API & Backend mockapigenerator

API Documentation Generator

Generate API docs from OpenAPI Includes a browser-first workflow inspired by swagger-jsdoc.

API & Backend apidocumentationgenerator

Request/Response Diff

Compare API responses Includes a browser-first workflow inspired by diff-match-patch.

API & Backend requestresponsediff

API Key Validator

Validate API keys format

API & Backend apikeyvalidator

MongoDB Query Builder

Build MongoDB queries visually

Database mongodbquerybuilder

PostgreSQL Syntax Checker

Validate PostgreSQL syntax Includes a browser-first workflow inspired by sql-parser.

Database postgresqlsyntaxchecker

MySQL Syntax Checker

Validate MySQL syntax Includes a browser-first workflow inspired by sql-parser.

Database mysqlsyntaxchecker

Oracle SQL Validator

Validate Oracle SQL Includes a browser-first workflow inspired by sql-parser.

Database oraclesqlvalidator

NoSQL Query Converter

Convert between NoSQL dialects

Database nosqlqueryconverter

SQL Injection Detector

Detect SQL injection vulnerabilities

Database sqlinjectiondetector

Database Relationship Visualizer

Visualize DB schemas Includes a browser-first workflow inspired by d3.js.

Database databaserelationshipvisualizer

ERD Generator

Generate Entity-Relationship Diagrams Includes a browser-first workflow inspired by mermaid.js.

Database erdgeneratordatabase

SQL Test Data Generator

Generate test data for databases Includes a browser-first workflow inspired by faker.js.

Database sqltestdata

Query Execution Planner

Visualize query execution plans Includes a browser-first workflow inspired by d3.js.

Database queryexecutionplanner

Database Index Analyzer

Analyze index efficiency

Database databaseindexanalyzer

GitHub Actions Validator

Validate workflow files Includes a browser-first workflow inspired by yaml.

DevOps & Cloud githubactionsvalidator

GitLab CI Validator

Validate GitLab CI files Includes a browser-first workflow inspired by yaml.

DevOps & Cloud gitlabcivalidator

Terraform Formatter

Format Terraform configs

DevOps & Cloud terraformformatterdevops & cloud

Ansible Playbook Validator

Validate Ansible playbooks Includes a browser-first workflow inspired by yaml.

DevOps & Cloud ansibleplaybookvalidator

Docker Linter

Lint Dockerfile Includes a browser-first workflow inspired by hadolint (external).

DevOps & Cloud dockerlinterdevops & cloud

Environment Variable Validator

Validate env var naming

DevOps & Cloud environmentvariablevalidator

SSL Certificate Generator

Generate self-signed SSL certs Includes a browser-first workflow inspired by node-forge.

DevOps & Cloud sslcertificategenerator

DNS Record Generator

Generate DNS configuration

DevOps & Cloud dnsrecordgenerator

Load Balancing Config Generator

Generate load balancer configs

DevOps & Cloud loadbalancingconfig

CloudFormation Template Validator

Validate AWS CloudFormation Includes a browser-first workflow inspired by yaml.

DevOps & Cloud cloudformationtemplatevalidator

Nginx Config Validator

Validate Nginx configs Includes a browser-first workflow inspired by None required (complex parsing).

DevOps & Cloud nginxconfigvalidator

Apache Config Validator

Validate Apache configs

DevOps & Cloud apacheconfigvalidator

Prometheus Scrape Config Validator

Validate Prometheus configs Includes a browser-first workflow inspired by yaml.

DevOps & Cloud prometheusscrapeconfig

Grafana Dashboard Validator

Validate Grafana dashboards

DevOps & Cloud grafanadashboardvalidator

Istio Config Validator

Validate Istio manifests Includes a browser-first workflow inspired by yaml.

DevOps & Cloud istioconfigvalidator

Linux Permission Calculator

Calculate chmod permissions

DevOps & Cloud linuxpermissioncalculator

Systemd Unit File Validator

Validate systemd units

DevOps & Cloud systemdunitfile

Color Palette Generator

Generate color schemes Includes a browser-first workflow inspired by chroma.js.

Generators colorpalettegenerator

Gradient Generator

Generate CSS gradients Includes a browser-first workflow inspired by chroma.js.

Generators gradientgeneratorgenerators

API Mock Data Generator

Generate mock API responses Includes a browser-first workflow inspired by faker.js, json-schema-faker.

Generators apimockdata

Test Case Generator

Generate test cases

Generators testcasegenerator

User Agent Generator

Generate browser user agents

Generators useragentgenerator

Email Generator

Generate fake emails Includes a browser-first workflow inspired by faker.js.

Generators emailgeneratorgenerators

Phone Number Generator

Generate fake phone numbers Includes a browser-first workflow inspired by faker.js.

Generators phonenumbergenerator

Credit Card Generator

Generate test credit cards Includes a browser-first workflow inspired by faker.js.

Generators creditcardgenerator

SSH Key Pair Generator

Generate SSH keys Includes a browser-first workflow inspired by node-forge or tweetnacl.

Generators sshkeypair

API Key Generator

Generate secure API keys Includes a browser-first workflow inspired by crypto.

Generators apikeygenerator

GUID Generator

Generate GUIDs Includes a browser-first workflow inspired by uuid.

Generators guidgeneratorgenerators

Coupon Code Generator

Generate coupon codes

Generators couponcodegenerator

Random Number Generator

Generate random numbers

Generators randomnumbergenerator

Random String Generator

Generate random strings

Generators randomstringgenerator

License Key Generator

Generate license keys Includes a browser-first workflow inspired by crypto.

Generators licensekeygenerator

JSON to Python Class

Generate Python dataclasses

AI Dev Tools jsontopython

JSON to C# Class

Generate C# classes

AI Dev Tools jsontoc

OpenAPI to Client SDK

Generate client SDKs Includes a browser-first workflow inspired by openapi-generator (external).

AI Dev Tools openapitoclient

GraphQL Type Generator

Generate GraphQL types Includes a browser-first workflow inspired by graphql-js.

AI Dev Tools graphqltypegenerator

React Component Generator

Generate React components

AI Dev Tools reactcomponentgenerator

HTML Template Generator

Generate HTML boilerplate

AI Dev Tools htmltemplategenerator

CSS Framework Generator

Generate CSS/Tailwind snippets

AI Dev Tools cssframeworkgenerator

SQL Insert Statement Generator

Generate INSERT SQL statements

AI Dev Tools sqlinsertstatement

Kotlin Data Class Generator

Generate Kotlin data classes

AI Dev Tools kotlindataclass

Rust Struct Generator

Generate Rust structs

AI Dev Tools ruststructgenerator

PHP Class Generator

Generate PHP classes

AI Dev Tools phpclassgenerator

Swift Codable Generator

Generate Swift Codable structs

AI Dev Tools swiftcodablegenerator

Swagger UI Generator

Generate Swagger UI from spec Includes a browser-first workflow inspired by swagger-ui.

AI Dev Tools swaggeruigenerator

GraphQL Resolvers Generator

Generate GraphQL resolver stubs Includes a browser-first workflow inspired by graphql-js.

AI Dev Tools graphqlresolversgenerator

Bundle Size Analyzer

Analyze JS bundle sizes Includes a browser-first workflow inspired by webpack-bundle-analyzer.

Performance & Analysis bundlesizeanalyzer

Performance Metrics Calculator

Calculate Web Vitals impact

Performance & Analysis performancemetricscalculator

Load Time Estimator

Estimate page load times

Performance & Analysis loadtimeestimator

Network Request Simulator

Simulate network conditions

Performance & Analysis networkrequestsimulator

Memory Leak Detector

Analyze potential memory leaks Includes a browser-first workflow inspired by None required (theoretical).

Performance & Analysis memoryleakdetector

Code Duplication Finder

Find duplicate code blocks Includes a browser-first workflow inspired by code-similarity.

Performance & Analysis codeduplicationfinder

Cyclomatic Complexity Calculator

Calculate code complexity Includes a browser-first workflow inspired by esprima.

Performance & Analysis cyclomaticcomplexitycalculator

Code Coverage Calculator

Estimate code coverage Includes a browser-first workflow inspired by nyc (istanbul).

Performance & Analysis codecoveragecalculator

Technical Debt Calculator

Estimate technical debt Includes a browser-first workflow inspired by sonarqube-metrics.

Performance & Analysis technicaldebtcalculator

API Response Time Analyzer

Analyze API latency

Performance & Analysis apiresponsetime

Database Query Optimizer

Suggest query optimizations

Performance & Analysis databasequeryoptimizer

SEO Score Calculator

Calculate SEO metrics

Performance & Analysis seoscorecalculator

Accessibility Score Checker

Check WCAG compliance Includes a browser-first workflow inspired by axe-core.

Performance & Analysis accessibilityscorechecker

Carbon Footprint Calculator

Estimate website carbon impact

Performance & Analysis carbonfootprintcalculator

Flow Chart Diagrammer

Create flowcharts Includes a browser-first workflow inspired by mermaid.js.

Visualization flowchartdiagrammer

Entity Relationship Diagram

Create ERD diagrams Includes a browser-first workflow inspired by mermaid.js.

Visualization entityrelationshipdiagram

Sequence Diagram Creator

Create sequence diagrams Includes a browser-first workflow inspired by mermaid.js.

Visualization sequencediagramcreator

Gantt Chart Generator

Create Gantt charts Includes a browser-first workflow inspired by mermaid.js.

Visualization ganttchartgenerator

Class Diagram Visualizer

Visualize UML class diagrams Includes a browser-first workflow inspired by mermaid.js.

Visualization classdiagramvisualizer

Tree Visualizer

Visualize tree structures Includes a browser-first workflow inspired by d3.js.

Visualization treevisualizervisualization

Graph Visualizer

Visualize graph structures Includes a browser-first workflow inspired by cytoscape.js.

Visualization graphvisualizervisualization

Dependency Graph Viewer

Visualize project dependencies Includes a browser-first workflow inspired by d3.js.

Visualization dependencygraphviewer

Network Topology Visualizer

Visualize network topologies Includes a browser-first workflow inspired by d3.js.

Visualization networktopologyvisualizer

Heat Map Generator

Generate heat maps Includes a browser-first workflow inspired by heatmap.js.

Visualization heatmapgenerator

Timeline Visualizer

Create interactive timelines Includes a browser-first workflow inspired by vis.js.

Visualization timelinevisualizervisualization

Mindmap Creator

Create mind maps Includes a browser-first workflow inspired by markmap.

Visualization mindmapcreatorvisualization

Sankey Diagram Maker

Create Sankey diagrams Includes a browser-first workflow inspired by d3.js.

Visualization sankeydiagrammaker

Tree Map Generator

Create tree maps Includes a browser-first workflow inspired by d3.js.

Visualization treemapgenerator

Chord Diagram Creator

Create chord diagrams Includes a browser-first workflow inspired by d3.js.

Visualization chorddiagramcreator

Unit Converter

Convert units (length, weight, etc) Includes a browser-first workflow inspired by convert-units.

Misc Utilities unitconvertermisc utilities

Timezone Converter

Convert between timezones Includes a browser-first workflow inspired by moment-timezone.

Misc Utilities timezoneconvertermisc utilities

Currency Converter

Convert currencies Includes a browser-first workflow inspired by None (external API needed).

Misc Utilities currencyconvertermisc utilities

Markdown Table Generator

Generate Markdown tables

Misc Utilities markdowntablegenerator

Number System Converter

Convert between number bases Includes a browser-first workflow inspired by big.js.

Misc Utilities numbersystemconverter

ISBN Validator

Validate ISBN numbers Includes a browser-first workflow inspired by isbn-validate.

Misc Utilities isbnvalidatormisc utilities

UUID Validator

Validate UUID format Includes a browser-first workflow inspired by uuid-validate.

Misc Utilities uuidvalidatormisc utilities

Lorem Ipsum Paragraph Generator

Generate multi-paragraph Lorem

Misc Utilities loremipsumparagraph

Database Schema Visualizer

Work with database schema visualizer directly in your browser.

Misc Utilities databaseschemavisualizer

PostgreSQL Validator

Work with postgresql validator directly in your browser.

Misc Utilities postgresqlvalidatormisc utilities

Categories Grid

Browse the toolkit by workflow type.

Favorites

Your saved tools stay on this device.

JSON Formatter

Format, beautify, validate, and inspect JSON with a fast split-pane editor.

JSON & Data jsonformatterbeautifier

Base64 Encode/Decode

Encode text to Base64 or decode Base64 back to readable content.

Encoding & Security base64encodingdecoder

URL Encode/Decode

Encode URLs safely or decode percent-encoded query strings.

Encoding & Security urlencodingdecoder

JWT Decoder

Decode JWT headers and payloads without sending tokens to a server.

Encoding & Security jwtsecuritytoken

Recently Used

Quickly jump back into your last tools.

JSON Formatter

Format, beautify, validate, and inspect JSON with a fast split-pane editor.

JSON & Data jsonformatterbeautifier

JSON Validator

Validate JSON syntax and get readable error messages before shipping data.

JSON & Data jsonvalidatorlint

JSON Minifier

Compress JSON by removing whitespace while preserving valid structure.

JSON & Data jsonminifiercompress

JSON Diff

Compare two JSON documents and highlight structural changes.

JSON & Data jsondiffcompare

Experimental Labs

AI dev helpers, DevOps viewers, and schema-aware utilities.

Cron Generator

Generate common cron expressions for scheduled tasks.

DevOps & Cloud crondevopsschedule

Cron Parser

Explain cron expressions in readable human language.

DevOps & Cloud cronparserdevops

Env Generator

Generate .env examples from key-value pairs and config notes.

DevOps & Cloud envdotenvdevops

Kubernetes YAML Validator

Validate Kubernetes YAML structure for common manifest fields.

DevOps & Cloud kubernetesyamldevops

Docker Compose Viewer

Inspect docker-compose services, ports, volumes, and environment settings.

DevOps & Cloud dockercomposedevops

JSON to TypeScript

Generate TypeScript interfaces from sample JSON.

AI Dev Tools typescriptjsontypes

JSON to Java POJO

Generate Java POJO class outlines from JSON fields.

AI Dev Tools javajsongenerator

JSON to Go Struct

Generate Go struct definitions from JSON samples.

AI Dev Tools gojsongenerator