# DevTools by developers.do - Complete Documentation

> A collection of free developer tools that run 100% client-side in your browser. No backend. All tool processing happens locally on the user device. Anonymized analytics are used to improve the site.

## About DevTools

DevTools is a suite of browser-based utilities for software developers built with privacy as a core principle.

- 100% client-side: tools run in the browser using JavaScript, WebAssembly, and Web APIs.
- No upload required: tool input is not transmitted to a backend.
- Open source: built with Next.js, React, TypeScript, and Tailwind CSS.
- Website: https://www.developers.do

## Tool Categories

### AI Tools

Category URL: https://www.developers.do/tools/ai-tools

#### JS Tokenizers
URL: https://www.developers.do/tools/js-tokenizer

Tokenize text using various AI tokenizers

#### RAG Chunker
URL: https://www.developers.do/tools/rag-chunker

Split text into retrieval-friendly chunks with overlap and token counts

#### Sentiment Analysis
URL: https://www.developers.do/tools/sentiment-analysis

Analyze emotional tone of text using AI

#### Zero-Shot Classification
URL: https://www.developers.do/tools/zero-shot-classification

Classify text into custom categories without training using AI

#### Sentence Similarity
URL: https://www.developers.do/tools/sentence-similarity

Generate embeddings and find semantic similarity between texts using AI

#### Question Answering
URL: https://www.developers.do/tools/question-answering

Answer questions based on provided context using AI

#### Fill-Mask Text Completion
URL: https://www.developers.do/tools/fill-mask

Complete sentences and predict missing words using AI

#### Text Summarization
URL: https://www.developers.do/tools/text-summarization

Summarize long text into concise overviews using AI

#### Text Extractor
URL: https://www.developers.do/tools/text-extractor

Extract emails, URLs, IPs, dates, and patterns from text

#### Vibe Check
URL: https://www.developers.do/tools/vibe-check

Generate AI code review, test plan, and production readiness prompts for vibe-coded apps

### Formatting

Category URL: https://www.developers.do/tools/formatting

#### JSON Prettifier
URL: https://www.developers.do/tools/json-prettifier

Format and validate JSON data

#### XML/HTML Formatter
URL: https://www.developers.do/tools/xml-prettifier

Format, validate, prettify, and minify XML or HTML data

#### XML ↔ JSON Converter
URL: https://www.developers.do/tools/xml-json-converter

Bidirectional XML-to-JSON and JSON-to-XML converter using the familiar @attr / _text convention; repeated tags collapse into arrays

#### JSONPath Query Engine
URL: https://www.developers.do/tools/jsonpath-tester

Test JSONPath expressions — supports dot/bracket access, wildcards, slices, recursive descent (..), and filter [?(...)] expressions

#### GraphQL Formatter
URL: https://www.developers.do/tools/graphql-formatter

Format and validate GraphQL queries, mutations, subscriptions, and fragments — preserves string literals, args, blocks, lists, and comments

#### TOML Parser
URL: https://www.developers.do/tools/toml-parser

Parse, validate, format, and round-trip TOML to/from JSON — spec-compliant via smol-toml

#### CSS Minifier / Beautifier
URL: https://www.developers.do/tools/css-formatter

Minify CSS by stripping comments and whitespace, or beautify minified CSS with re-indentation — preserves spaces inside parentheses for values like rgba() and calc()

#### JavaScript Minifier
URL: https://www.developers.do/tools/js-minifier

Strip comments and whitespace from JavaScript while preserving strings, template literals, and regex syntax — no AST, no variable renaming, just fast cosmetic minification

#### Data URI Converter
URL: https://www.developers.do/tools/data-uri-converter

Convert text to a data: URI with UTF-8 Base64 encoding, or decode a data: URI back to text or binary bytes — handles any MIME type

#### Markdown Live Preview
URL: https://www.developers.do/tools/markdown-preview

Write Markdown on the left, see the rendered HTML preview on the right — supports headings, bold, italic, code, lists, quotes, links, autolinks, and GFM strikethrough

#### SVG Editor
URL: https://www.developers.do/tools/svg-editor

Edit SVG code on the left, see the live preview on the right — strips scripts and event handlers for safety, adjusts missing xmlns

#### SVG Path Visualizer
URL: https://www.developers.do/tools/svg-path-visualizer

Paste an SVG path d attribute and see it rendered instantly — includes presets (curve, star, arc, bezier), adjustable stroke/fill colors, and an optional grid overlay

#### HL7 Parser
URL: https://www.developers.do/tools/hl7-parser

Read and parse HL7 v2 messages into structured JSON

#### HL7 to FHIR Converter
URL: https://www.developers.do/tools/hl7-to-fhir

Convert HL7 v2 messages to FHIR R4 Bundles

#### Diff / Text Compare
URL: https://www.developers.do/tools/diff-compare

Compare two texts and see color-coded differences

#### Stack Trace Formatter
URL: https://www.developers.do/tools/stacktrace-formatter

Format and beautify JavaScript, Python, Java, C#, Go, PHP, and Ruby stack traces

#### Beautify Stack Trace
URL: https://www.developers.do/tools/beautify-stack-trace

Clean up and beautify messy error stack traces for readability

#### Stack Trace Analyzer
URL: https://www.developers.do/tools/stacktrace-analyzer

Analyze stack traces to identify root causes, explain errors, and separate app from framework code

#### Base64 Encoder/Decoder
URL: https://www.developers.do/tools/base64-encoder

Encode and decode Base64 strings

#### File Size Converter
URL: https://www.developers.do/tools/file-size-converter

Convert file sizes between decimal (SI) and binary (IEC) units

#### Unix Timestamp Converter
URL: https://www.developers.do/tools/unix-timestamp

Convert Unix epoch timestamps to human-readable dates — single or batch — with timezone support

#### Cron Expression Tester
URL: https://www.developers.do/tools/cron-tester

Test and parse cron expressions, explain them in plain English, and preview upcoming run times across timezones

#### Cron Expression Generator
URL: https://www.developers.do/tools/cron-generator

Build cron expressions visually with field controls — no syntax knowledge required

#### URL Encoder / Decoder
URL: https://www.developers.do/tools/url-encoder

Encode and decode URLs using encodeURIComponent and encodeURI

#### YAML/JSON Converter & Formatter
URL: https://www.developers.do/tools/yaml-json-converter

Convert between YAML and JSON, or format and validate standalone YAML

#### CSV ↔ JSON Converter
URL: https://www.developers.do/tools/csv-json-converter

Convert between CSV and JSON with auto-detection, delimiter handling, type inference, and nested-object flattening

#### CSV Viewer / Table Explorer
URL: https://www.developers.do/tools/csv-viewer

Paste CSV and explore it as a sortable, searchable table with sticky headers — no spreadsheet required

#### SQL Formatter
URL: https://www.developers.do/tools/sql-formatter

Format and prettify SQL queries with support for MySQL, PostgreSQL, SQLite, and more

#### String Case Converter
URL: https://www.developers.do/tools/string-case-converter

Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, path/case, title, and sentence case

#### Text Statistics
URL: https://www.developers.do/tools/text-statistics

Live word, character, sentence, line, and paragraph counts with reading time and average length stats

#### Line Sorter & Deduplicator
URL: https://www.developers.do/tools/line-sorter-dedup

Sort lines alphabetically, numerically, by length, with optional deduplication and trimming

#### String Escape / Unescape
URL: https://www.developers.do/tools/string-escape

Escape and unescape text for JSON, XML, CSV, regex, or POSIX shell contexts

#### Whitespace Visualizer & Cleaner
URL: https://www.developers.do/tools/whitespace-cleaner

Spot invisible whitespace characters (tabs, NBSP, zero-width, trailing) and clean them with batch options

#### HTML Entity Encoder / Decoder
URL: https://www.developers.do/tools/html-entity-encoder

Encode text to HTML entities (named, decimal, hex) and decode entities back to characters

#### Unicode Escape / Unescape
URL: https://www.developers.do/tools/unicode-escape

Convert text to \\uXXXX and \\u{XXXXX} Unicode escapes and back — handles emoji and surrogate pairs

#### Morse Code Translator
URL: https://www.developers.do/tools/morse-code-translator

Convert text to ITU-R M.1677-1 Morse code and back — supports letters, digits, common punctuation, and word breaks

### Algorithms

Category URL: https://www.developers.do/tools/algorithms

#### String Similarity
URL: https://www.developers.do/tools/string-similarity

Compare strings using Jaro-Winkler, Levenshtein, Dice, and Hamming algorithms

#### Regex Tester
URL: https://www.developers.do/tools/regex-tester

Test regular expressions with match highlighting, capture groups, and string replacement

#### Regex Library
URL: https://www.developers.do/tools/regex-library

Browse and copy common regular expressions for validation, extraction, and text processing

#### Number Base Converter
URL: https://www.developers.do/tools/number-base-converter

Convert numbers between binary, octal, decimal, and hex with two's complement

#### SemVer Comparator
URL: https://www.developers.do/tools/semver-comparator

Compare, sort, and validate semantic version strings per SemVer 2.0.0 with prerelease and build metadata support

### Apps

Category URL: https://www.developers.do/tools/apps

#### iOS App Lookup
URL: https://www.developers.do/tools/ios-app-lookup

Look up iOS app metadata from the App Store using bundle ID

#### GameWobble
URL: https://gamewobble.com

Free bite-sized browser games you can play instantly with no downloads or signup

#### Terremoto
URL: https://terremoto.developers.do

iOS app for tracking earthquakes in real-time

#### FedPulse
URL: https://fedpulse.developers.do

iOS app to search, save, and track federal government jobs

#### FAA Part 107 Quiz Prep
URL: https://part107.developers.do

iOS app for FAA Part 107 drone pilot certification exam preparation

#### Citizenship Test Prep
URL: https://citizenshiptest.developers.do

iOS app for US citizenship naturalization test preparation

#### ClawPet
URL: https://clawpet.clawpantry.com

iOS virtual desktop pet that visualizes bot activity in real-time

#### Tech - Interview Prep
URL: https://apps.apple.com/us/app/tech-interview-prep/id6785688459

iOS app for technical interview prep with 1,400+ questions across AI, system design, and more

#### DownRangeHQ Shot Timer
URL: https://apps.apple.com/us/app/downrangehq-shot-timer/id6783020376

iOS and Apple Watch shot timer and drill tracker for competition shooters

#### Melody Island: Kids Piano
URL: https://apps.apple.com/us/app/melody-island-kids-piano/id6785279265

iOS piano app for kids with colorful keys, adventure levels, and guided songs

#### ColorPop Calculator
URL: https://apps.apple.com/us/app/colorpop-calculator/id6785313208

iOS calculator for kids ages 4-8 with visual object-based math

#### Phlebotomy Technician ExamPrep
URL: https://apps.apple.com/us/app/phlebotomy-technician-examprep/id6758586662

iOS app for NHA Certified Phlebotomy Technician exam preparation

#### CCMA Exam Prep
URL: https://apps.apple.com/us/app/ccma-exam-prep/id6758587083

iOS app for Certified Clinical Medical Assistant exam preparation

### Generators

Category URL: https://www.developers.do/tools/generators

#### Password Generator
URL: https://www.developers.do/tools/password-generator

Generate secure random passwords

#### UUID Generator
URL: https://www.developers.do/tools/uuid-generator

Generate UUIDs across all RFC 9562 versions — nil, v1, v2, v3, v4, v5, v6, v7, and v8

#### Lorem Ipsum Generator
URL: https://www.developers.do/tools/lorem-ipsum-generator

Generate placeholder text for designs

#### Random Number Generator
URL: https://www.developers.do/tools/random-number-generator

Generate random numbers and see code samples in multiple languages

#### QR Code Generator
URL: https://www.developers.do/tools/qr-code-generator

Generate QR codes from text, URLs, or any data

#### ULID Generator
URL: https://www.developers.do/tools/ulid-generator

Generate ULIDs — 26-character lexicographically sortable identifiers (48-bit timestamp + 80-bit random) with optional monotonic mode

#### Git Branch Name Generator
URL: https://www.developers.do/tools/git-branch-name-generator

Convert a feature description into a clean, git-safe branch name with optional prefix (feat, fix, chore, etc.) and ticket id. Includes copy-paste checkout and push commands

#### ASCII Art Text Generator
URL: https://www.developers.do/tools/ascii-art-generator

Convert text to ASCII art banner with built-in block, banner, and thin fonts — no external font files, works in any browser

### Code & Schemas

Category URL: https://www.developers.do/tools/code-and-schemas

#### JSON to TypeScript
URL: https://www.developers.do/tools/json-to-typescript

Convert JSON to TypeScript interfaces

#### JSON to JSDoc
URL: https://www.developers.do/tools/json-to-jsdoc

Convert JSON to JSDoc type definitions

#### JSON to C#
URL: https://www.developers.do/tools/json-to-csharp

Convert JSON to C# classes

#### JSON to Swift
URL: https://www.developers.do/tools/json-to-swift

Convert JSON to Swift structs

#### JSON to Kotlin
URL: https://www.developers.do/tools/json-to-kotlin

Convert JSON to Kotlin data classes

#### JSON to Python
URL: https://www.developers.do/tools/json-to-python

Convert JSON to Python dataclasses or Pydantic models

#### JSON to Go
URL: https://www.developers.do/tools/json-to-go

Convert JSON to Go structs

#### JSON to Rust
URL: https://www.developers.do/tools/json-to-rust

Convert JSON to Rust structs

#### JSON Schema Validator & Generator
URL: https://www.developers.do/tools/json-schema-validator

Infer a JSON Schema (draft 2020-12 or draft-07) from JSON and validate JSON against a schema — supports multiple samples to detect optional fields

#### Color Picker
URL: https://www.developers.do/tools/color-picker

Pick colors, convert between HEX/RGB/HSL/HSV/CMYK, and browse curated palettes (Tailwind, Nord, Solarized, Dracula, and more)

### Security

Category URL: https://www.developers.do/tools/security

#### Secrets Scanner
URL: https://www.developers.do/tools/secrets-scanner

Scan text, logs, or configs for leaked keys and tokens

#### JWT Decoder
URL: https://www.developers.do/tools/jwt-decoder

Decode and inspect JWT tokens

#### MD5 Hash
URL: https://www.developers.do/tools/md5-generator

Generate MD5 hashes from text

#### SHA-1 Hash
URL: https://www.developers.do/tools/sha1-generator

Generate SHA-1 hashes from text

#### SHA-256/384/512 Hash
URL: https://www.developers.do/tools/sha256-generator

Generate secure SHA-256, SHA-384, or SHA-512 hashes from text

#### HMAC Generator
URL: https://www.developers.do/tools/hmac-generator

Generate HMAC signatures with SHA-1, SHA-256, SHA-384, or SHA-512 — output as hex, base64, or base64url

#### Clawdbot Security Scanner
URL: https://www.developers.do/tools/clawdbot-security-scanner

Audit Clawdbot/Moltbot/OpenClaw configs for security vulnerabilities

#### Certificate & CSR Decoder
URL: https://www.developers.do/tools/csr-decoder

Decode X.509 certificates and PKCS#10 CSRs — subject, issuer, expiry, SANs, extensions, and key details

### SAML

Category URL: https://www.developers.do/tools/saml

#### SAML Decoder
URL: https://www.developers.do/tools/saml-decoder

Decode SAML Requests/Responses from Base64 to readable XML

#### SAML Metadata Parser
URL: https://www.developers.do/tools/saml-metadata-parser

Parse SAML Metadata XML and extract IdP/SP configuration

#### SAML Certificate Inspector
URL: https://www.developers.do/tools/saml-cert-inspector

Inspect X.509 certificates from SAML metadata, responses, or PEM

#### SAML Assertion Builder
URL: https://www.developers.do/tools/saml-builder

Generate test SAML Responses, AuthnRequests, and LogoutRequests

#### SAML Metadata Generator
URL: https://www.developers.do/tools/saml-metadata-generator

Generate SAML 2.0 EntityDescriptor metadata XML for SPs and IdPs

#### SAML Response Validator
URL: https://www.developers.do/tools/saml-validator

Debug a SAML Response and find out why SSO login is failing

### Networking

Category URL: https://www.developers.do/tools/networking

#### API Tester
URL: https://www.developers.do/tools/api-tester

Test and view API responses

#### HTTP Status Code Reference
URL: https://www.developers.do/tools/http-status-codes

Searchable reference of all HTTP status codes with descriptions and use cases

#### MIME Type Lookup
URL: https://www.developers.do/tools/mime-type-lookup

Search common MIME types by file extension, MIME string, or category — covers images, video, audio, archives, documents, code, fonts, and data formats

#### Common Port Number Reference
URL: https://www.developers.do/tools/port-reference

Searchable reference of common TCP/UDP ports for web, database, email, file transfer, remote access, messaging, networking, DevOps, and security services

#### CIDR / Subnet Calculator
URL: https://www.developers.do/tools/cidr-calculator

IPv4 and IPv6 CIDR calculator — network address, broadcast, subnet mask, host range, RFC 1918 / ULA private range detection, reverse DNS PTR, and subnet splitting

### Data

Category URL: https://www.developers.do/tools/data

#### OSS Data
URL: https://data.developers.do

Open-source data tools for developers