Developer Tools that Respect Your Privacy
Format, convert, and validate JSON, SQL, XML, CSV and more without sending confidential tokens, keys, or database schemas to remote servers.
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JSON Formatter
Format, validate, and explore JSON with a collapsible tree view.
JSON Validator
Instantly validate JSON syntax, identify errors with exact line and column locations, and fix formatting bugs.
JSON to CSV
Convert JSON arrays and nested objects into clean, downloadable CSV spreadsheets in seconds.
CSV to JSON
Convert CSV tabular data into structured JSON objects or arrays with automatic type detection.
JSON to XML
Convert JSON documents into clean, structured, and customizable XML markup instantly.
XML to JSON
Convert XML documents into readable, valid JSON objects with automatic type parsing and attribute preservation.
XML Formatter
Format, beautify, and validate messy XML files with custom indentation and instant syntax error detection.
SQL Formatter
Format messy SQL into readable, consistently indented queries.
HTML Formatter
Clean up unformatted, messy HTML markup into well-indented, readable code with customizable line wrapping.
CSS Beautifier
Format, organize, or minify CSS stylesheets with consistent indentation, selector spacing, and clean rule separation.
JavaScript Beautifier
Format, un-minify, or compact JavaScript & TypeScript code into clean, readable scripts with custom indentation.
YAML to JSON
Convert YAML configuration files into structured JSON documents (or JSON to YAML) instantly.
Base64 Encode & Decode
Encode plain text to Base64 or decode Base64 strings to UTF-8 text with URL-safe encoding and automatic JSON formatting.
JWT Decoder
Decode JSON Web Tokens (JWT) client-side. Inspect header claims, payload data, expiration times, and token signatures.
Diff Checker
Compare two text or code snippets side-by-side to highlight added, removed, and modified lines instantly.
JSON to TypeScript
Generate strongly typed TypeScript interfaces and type aliases from sample JSON documents instantly.
Regex Tester
Test, debug, and validate Regular Expressions in real-time with capturing group extraction and flag controls.
UUID / ULID / NanoID
Generate or inspect UUID v4/v7, ULID, and NanoID identifiers in bulk — cryptographically random, fully offline.
Hash Generator
Generate cryptographically secure SHA-256, SHA-512, SHA-1, and MD5 message digests client-side.
Timestamp Converter
Convert Unix epoch seconds and milliseconds to human-readable UTC & Local date-time formats instantly.
URL Encode & Decode
Encode, decode, or parse URL query strings and percent-encoded query parameters instantly.
Markdown to HTML
Convert Markdown documents, tables, lists, and code blocks into clean, formatted HTML markup.
cURL to Code
Convert raw cURL shell commands into clean JavaScript Fetch, Axios, or Python requests code instantly.
Cron Parser
Translate complex cron expressions into human-readable English schedules and validate 5-part and 6-part cron syntax.
Color Converter
Convert between HEX, RGB, RGBA, and HSL color formats with channel breakdowns and CSS variable exports.
JSON Minifier
Compress and minify JSON data by stripping all whitespace and line breaks to minimize payload size.
SQL Minifier
Compress messy SQL queries into single-line statements by removing comments, blank lines, and unnecessary spaces.
HTML to Markdown
Convert HTML markup, tables, lists, and formatted content back into clean, readable Markdown syntax.
TOML to JSON
Convert TOML configuration files (Cargo.toml, pyproject.toml, Wrangler) into structured JSON documents.
Gzip Size Estimator
Measure uncompressed vs Gzip/Brotli compressed byte sizes and bandwidth savings directly in your browser.
JWT Generator
Generate and sign JSON Web Tokens (JWT) using HMAC-SHA256, HMAC-SHA384, or HMAC-SHA512.
CSS Minifier
Compress and minify CSS stylesheets by removing whitespace, line breaks, and comments.
Markdown Table Generator
Convert CSV, TSV, or JSON data into perfectly aligned GitHub-Flavored Markdown tables.
JSON Schema Validator
Validate JSON documents against JSON Schema definitions using Ajv. Path-accurate structural error reports.
QR Code Generator
Generate clean, customizable vector SVG QR codes from URLs, text, Wi-Fi keys, and tokens.
URL Parser & Params Builder
Deconstruct URLs into protocol, host, port, path, hash, and structured query parameters with full decoding.
HTML Entity Encoder & Decoder
Convert special characters to named, decimal, or hex HTML entities and decode encoded HTML entities back to raw text.
Number Base & Radix Converter
Convert numbers instantly between Decimal, Binary, Hexadecimal, Octal, and ASCII with bit-length analysis.
SVG Optimizer & CSS Data URI
Strip editor junk, comments, and redundant metadata from SVGs. Convert directly to CSS Data URI or React JSX.
Cron Expression Builder
Assemble and generate 5-part cron schedules from field parameters or text rules with human-readable descriptions.
GraphQL Formatter & Minifier
Format, beautify, validate AST, and minify GraphQL queries, mutations, subscriptions, and SDL schemas.
Base64 Image & Data URI Converter
Convert between raw Base64 strings, Data URIs, HTML <img> tags, and CSS background rules with automatic MIME detection.
Bcrypt Hash Generator & Verifier
Generate secure salted Bcrypt password hashes ($2a$) or verify plaintext passwords against existing hashes locally.
YAML to TOML Converter
Convert configuration files seamlessly between YAML and TOML formats with full data type preservation.
JSONPath & JQ Query Evaluator
Test JSONPath expressions ($.store.book[*].author) against complex JSON payloads with instant match filtering.
Chmod Permissions Calculator
Convert between Linux octal permissions (755, 644, 777) and symbolic notations (rwxr-xr-x) with bit breakdown and security notes.
IP Subnet & CIDR Calculator
Calculate network range, broadcast IP, usable hosts, subnet mask, wildcard mask, and binary breakdown from any CIDR notation.
HTTP Headers & Security Inspector
Parse HTTP headers, audit critical security headers (HSTS, CSP, X-Frame-Options, CORS), and calculate a security grade.
TypeScript to JSON Schema Converter
Convert TypeScript interfaces and type definitions directly to valid Draft-07 JSON Schema specifications.
Regular Expression Generator
Generate battle-tested regular expressions with explanation, flags, test cases, and code snippets in JavaScript, TypeScript, Python, and Go.
OpenAPI Formatter & Validator
Validate OpenAPI 3 and Swagger 2 documents, then format them as readable JSON or YAML.
GraphQL to TypeScript
Generate readable TypeScript interfaces, enums, unions, and scalar types from GraphQL SDL.
Dockerfile Formatter & Linter
Normalize Dockerfile instructions and catch common build mistakes before you ship.
GitHub Actions Workflow Validator
Format workflow YAML and catch missing jobs, runners, triggers, and steps before committing.
.env Formatter & Validator
Normalize environment variables and catch duplicate keys, malformed lines, and unsafe values.
Kubernetes Manifest Validator
Format multi-document Kubernetes YAML and catch missing metadata or workload containers.
.gitignore Generator
Combine curated .gitignore templates for Node, Python, Docker, and more into one deduplicated file.
CSV/TSV Column Aligner
Turn raw CSV or TSV data into a plain-text table with aligned columns, like the Unix `column -t` command.
Certificate & JWK Inspector
Inspect X.509 PEM certificates, CSRs, private-key fingerprints, and JSON Web Keys locally — without uploading.
HAR to cURL / Fetch
Paste a Chrome DevTools HAR export and generate ready-to-run curl, fetch, or axios snippets.
JWE Decoder
Inspect JSON Web Encryption (JWE) compact tokens locally — header, IV, and part sizes without decrypting.
CSS to Tailwind
Heuristically map common CSS declarations to Tailwind utility classes.
SQL to ERD
Parse CREATE TABLE statements and export a Mermaid erDiagram with PK/FK annotations — client-side only.
Unified Patch
Generate git-style unified diffs, structured patch JSON, or apply a patch to original text — fully offline.
.gitignore Parser
Explain every .gitignore rule, count negations, and guess stacks to feed back into the generator — offline.
GraphQL to cURL
Turn a GraphQL operation (plus optional variables) into a ready-to-run curl command — entirely in-browser.
JSON Schema → Example
Generate sample JSON documents from a JSON Schema using defaults, enums, formats, and property heuristics.
Clean code. Private by default.
Every transform runs in your browser tab — no accounts, no rate limits, no paywalls.
Zero Data Retention
Production logs, tokens, and dumps stay on your device unless you explicitly share.
CodeMirror 6 Engine
Line numbers, syntax highlights, tree views, and keyboard shortcuts that feel like an IDE.
Free & Open
No signup. Free cheat sheets and references alongside the tools.