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Essential tools for web developers, programmers, and software engineers.
Showing 36 of 36 tools
Beautify, minify, sort, repair and validate JSON with precise error location, a collapsible tree view and path queries.
Open ToolUTF-8-safe Base64 encode & decode with a URL-safe variant, line-wrapping and file-to-Base64 (data URI).
Open ToolEncode and decode URLs and components, with a live breakdown of query parameters.
Open ToolDecode and inspect a JWT's header, payload and claims with human-readable timestamps and live expiry status.
Open ToolGenerate MD5, SHA-1, SHA-256, SHA-384, SHA-512 and HMAC digests for text or files.
Open ToolTest and debug regular expressions with live match highlighting, capture groups, replace and example patterns.
Open ToolMinify HTML, strip comments and whitespace while protecting pre/script/style, with a size-saved readout.
Open ToolMinify CSS, remove comments and whitespace safely (strings and data URIs preserved) with a size-saved readout.
Open ToolConvert JSON to YAML and YAML back to JSON, bidirectional, no server round-trip.
Open ToolConvert CSV data into a JSON array of objects, with smart number and boolean detection.
Open ToolConvert a JSON array of objects into clean, spreadsheet-ready CSV.
Open ToolConvert Markdown text to HTML.
Open ToolConvert your Markdown (.md) files to high-quality PDFs instantly. Fast, free, secure, and works directly in your browser with no installation or signup required.
Open ToolGenerate UUID v4, time-ordered UUID v7, NIL, ULID and NanoID, cryptographically random, in bulk.
Open ToolConvert between HEX, RGB, HSL.
Open ToolGenerate TypeScript, Go, Python, Rust and JSON Schema from a JSON sample.
Open ToolGenerate strong, secure passwords.
Open ToolCompare code snippets and show differences.
Open ToolCalculate Unix file permissions.
Open ToolRemove whitespace from JSON for smaller payload size.
Open ToolBeautify and format SQL queries.
Open ToolFormat and beautify XML documents.
Open ToolEncode and decode HTML entities.
Open ToolParse and analyze HTTP response headers.
Open ToolBuild, describe in plain English and preview the next run times of cron schedules.
Open ToolCreate JWT tokens for testing and development.
Open ToolSend HTTP requests and inspect responses.
Open ToolGenerate multiple UUIDs at once (up to 10,000).
Open ToolCommon regex patterns with testing, ready to copy and use.
Open ToolQuery JSON with JSONPath ($, wildcards, recursive descent, slices) and explore every path to a value.
Open ToolEscape and unescape strings for JSON, JavaScript, HTML, URL, CSV, SQL, RegExp, shell and Unicode.
Open ToolParse a URL or query string into editable params and build it back: arrays, encoding and JSON output.
Open ToolInfer a JSON Schema (draft-07) from a JSON sample: types, required, formats and enums.
Open ToolSemantic, order-independent diff of two JSON documents: added, removed and changed values by path.
Open ToolGenerate realistic fake JSON, CSV or SQL test data from a simple field schema: names, emails, dates, UUIDs and more.
Open ToolBuild cURL commands from a request and convert them to fetch or axios code, and parse cURL back.
Open ToolToolsMonk's developer tools bring together 36 free browser-based utilities for users who want to essential tools for web developers, programmers, and software engineers. Instead of opening multiple websites for related tasks, you can compare similar workflows in one place and move from one tool to the next without extra setup.
Popular starting points in this category include JSON Formatter, Base64 Encoder/Decoder, URL Encoder/Decoder, and JWT Decoder. Every tool is designed to work quickly in modern browsers, which makes this collection useful for first-time visitors, repeat users, and teams that need straightforward results without downloads or account creation.
This category currently includes 6 popular picks and 7 trending tools, helping users discover the most in-demand options first while still keeping specialized utilities easy to find through search and filters.
Users choose ToolsMonk's developer tools because most of these tools run entirely in the browser with no sign-up and no downloads, so your files and inputs are never uploaded anywhere. Whether you are working from a shared computer, a locked-down corporate machine, or simply value your privacy, that keeps the work on your own device. A small number of tools do need a server to work at all; those are named individually in our Privacy Policy, along with what they send and who receives it. The result is a fast, private experience that works the moment you open a tool in any modern browser.
Many workflows span more than one category. If you are working with files here, you may also find useful utilities in related sections across ToolsMonk—from converters and generators to analyzers and formatters. Each category page follows the same layout, so once you are familiar with one, navigating to a neighbouring category is seamless. Use the sidebar to jump between categories and build multi-step workflows without leaving the platform.
Practical how-tos from the ToolsMonk blog that use the tools in this category.
JSON Web Tokens power authentication in millions of web applications. Understand how JWTs work, their structure, security considerations, and best practices for implementing stateless authentication in your projects.
Read the guideTesting APIs is a daily task for modern developers. Learn how to test REST APIs efficiently using cURL commands, Postman collections, and browser developer tools, with practical examples for common scenarios.
Read the guideManually doing repetitive tasks is the biggest time waste in modern work. Learn how to identify automation opportunities, use no-code tools, and build workflows that handle routine work automatically while you focus on what matters.
Read the guideJSON is the universal data format powering APIs, configs, and databases. Everything you need to know about JSON formatting, validation, beautification, and best practices, with free online tools to speed up your workflow.
Read the guideMalware infections cost individuals an average of $4,000 in damages. Learn how different types of malware work, the warning signs of infection, proven prevention strategies, and free tools to protect your devices from threats.
Read the guideIdentity theft affects 15 million Americans annually. Learn how criminals steal personal data, the warning signs that your identity has been compromised, and proven prevention strategies that protect your financial and personal information.
Read the guideCommon questions about developer tools, the tools available in this category, and how to choose the right workflow.