Developer Tools

Format JSON, encode Base64 and URLs, test regex, decode JWTs, validate HTML, and check npm packages for size and known vulnerabilities.

33 tools

Developer Tools tools

JSON Formatter and Validator

Format, validate, beautify, and minify JSON data with a collapsible tree view and line-and-column error detection.

Developer Tools

JSON to CSV Converter

Convert a JSON array of objects to CSV with automatic column headers, and convert CSV back to JSON in the same tool.

Developer Tools

CSV to JSON Converter

Convert CSV data to a JSON array of objects with header mapping and automatic comma, semicolon, or tab detection.

Developer Tools

Base64 Encode and Decode

Encode text to Base64 and decode Base64 strings back to readable text, with full UTF-8 support.

Developer Tools

URL Encode and Decode

Encode special characters for URLs or decode percent-encoded strings back to readable text.

Developer Tools

HTML Entity Encode and Decode

Convert special characters to HTML entities and decode HTML entities back to readable text.

Developer Tools

Regex Tester

Test regular expressions with real-time match highlighting, group capture display, and a pattern library.

Developer Tools

JWT Decoder

Decode JSON Web Tokens to inspect header, payload, and signature without needing the secret key.

Developer Tools

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and dates back to Unix timestamps instantly.

Developer Tools

UUID Generator

Generate random UUIDs in v4 and v7 formats with bulk generation and one-click copy support.

Developer Tools

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text or files right in your browser.

Developer Tools

CSS Minifier

Minify CSS by removing whitespace, comments, and redundant code to reduce file size.

Developer Tools

JavaScript Minifier

Minify JavaScript by removing whitespace, line breaks, and comments for smaller files, without renaming your code.

Developer Tools

HTML Minifier

Minify HTML by removing comments and collapsing whitespace between tags and inside tags to reduce document size.

Developer Tools

Cron Expression Parser

Parse cron expressions into human-readable descriptions and preview the next scheduled run times.

Developer Tools

Chmod Calculator

Convert between symbolic and numeric Unix file permissions with a visual chmod calculator.

Developer Tools

JSON to YAML Converter

Convert JSON documents to YAML format with syntax validation, clean formatting, and instant preview.

Developer Tools

YAML to JSON Converter

Parse YAML documents and convert to formatted JSON with error reporting and syntax validation.

Developer Tools

JSON to XML Converter

Convert JSON data to well-formed XML documents with customizable root element and formatting options.

Developer Tools

XML to JSON Converter

Parse XML documents and convert to structured JSON, with attributes kept as @_-prefixed keys and well-formedness checks.

Developer Tools

JSON to TOML Converter

Convert JSON objects to TOML format with type preservation and clean table structure output.

Developer Tools

TOML to JSON Converter

Parse TOML documents and convert to formatted JSON output with validation and error reporting.

Developer Tools

TOML to YAML Converter

Convert TOML configuration files to YAML format seamlessly with structure preservation.

Developer Tools

YAML to TOML Converter

Transform YAML documents to TOML configuration format with proper table structure and types.

Developer Tools

XML Formatter and Prettifier

Format, indent, and validate XML documents with customizable indentation and output options.

Developer Tools

YAML Formatter and Viewer

Format, validate, and visualize YAML documents with tree view and customizable indentation.

Developer Tools

JSON Minifier

Minify JSON by removing whitespace and formatting for compact, production-ready output.

Developer Tools

JSON Diff Viewer

Compare two JSON documents with semantic diff highlighting and detailed change detection.

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SQL Formatter and Prettifier

Format SQL queries with keyword uppercasing, proper indentation, and dialect support.

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URL Parser

Break down URLs into protocol, host, port, path, query parameters, and hash components.

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Package Vulnerability Checker

Check npm, PyPI, Maven, Go and other packages for known vulnerabilities and CVEs, and see which version fixes each.

Developer Tools

npm Package Size Checker

See the minified and gzipped size of any npm package, its download time, dependency count and whether it tree-shakes.

Developer Tools

HTML Validator

Check HTML for errors right in your browser. Paste code or upload a file to see each problem with its line and rule.

Developer Tools

Finding the Right Developer Tool

Most jobs here involve reading data, converting it, or preparing it for production. For reading, the JSON Formatter indents messy JSON and points to the line and column of any syntax error. When two API responses should match but do not, the JSON Diff Viewer lists every added, removed and changed value by its path.

For converting, pick the tool named after your source and target formats, such as JSON to YAML or CSV to JSON. Database work has its own helper. The SQL Formatter uppercases keywords and indents long queries, with dialect options such as MySQL and PostgreSQL.

Some small tasks come up again and again. The Chmod Calculator turns file permissions such as rwxr-xr-x into the number 755 and back. The UUID Generator makes random v4 or time-ordered v7 IDs in bulk. The JWT Decoder shows the header and payload of a token. It does not check the signature, so a token that decodes cleanly is not proof that it is genuine.

Explore Other Categories

DevOps ToolsConvert Docker run commands to Compose, check software end-of-life dates, browse Git and regex cheatsheets, and build cron expressions.
Web and SEO ToolsGenerate meta tags, check security headers, unshorten links, find Wayback Machine snapshots, and look up HTTP status codes and MIME types.
Text and WritingCount words, check grammar and spelling, find rhymes and definitions, convert case, compare text, and transform text in many ways.
Security and EncryptionGenerate passwords, check their strength and data breaches, create hashes, encrypt text, detect IP info, and parse user agents.