Free Developer Tools

Why Browserbeam is building free developer tools

Every developer has a graveyard of one-off scripts. The cURL wrapper that checked a list of URLs. The Python snippet that prettified a response body. The shell alias that decoded a JWT. These utilities solve real problems, but they accumulate as scattered files, forgotten gists, and duplicated effort.

This tool library is being built to replace that graveyard. Each tool solves one job fast, runs in your browser without setup, and connects naturally to the browser automation and inspection work Browserbeam already supports.

What's included: tools by category

Code & Format

The JSON Formatter & Validator formats raw API output into readable, indented structure, validates syntax and catches common parse errors, and minifies payloads when you need a compact version for transport. It runs entirely in the browser.

The HTML Formatter & Beautifier takes minified or messy HTML and pretty-prints it with proper indentation. Choose 2 spaces, 4 spaces, or tabs, then switch to minify mode when you need the compact version. Like the JSON formatter, it runs entirely in your browser.

The Curl Command Generator converts curl commands into Python, JavaScript, Ruby, and PHP code. Paste a curl command copied from Chrome DevTools or your terminal, pick a language, and get a working code snippet you can drop straight into your project. Dedicated pages are available for curl to Python, curl to JavaScript, curl to PHP, and curl to Ruby.

The HTML to Markdown Converter turns HTML markup into clean Markdown. Paste raw HTML from any source — view-source, a CMS export, an API response — and get readable Markdown with configurable heading styles, bullet characters, code block formats, and link styles. Ideal for documentation migration, web scraping output, and preparing content for LLM pipelines.

Testing & Validation

The Bulk HTTP Status Checker tests up to 100 URLs at once and returns status codes, redirect chains, final destinations, and response times in one pass. It supports multiple user agents so you can compare how a URL responds to a browser versus Googlebot or Bingbot.

The Robots.txt Tester & Validator parses robots.txt content and tests any URL path against any user-agent, showing you exactly which directive matched and why. It validates syntax, flags common mistakes like rules before a User-agent line, and lists all sitemaps and crawl-delay values. Use it to verify that Googlebot, GPTBot, Bingbot, and other crawlers can reach the pages you want indexed.

The HTTP Header Checker fetches any URL and inspects every HTTP response header. It validates security headers (HSTS, CSP, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, Permissions-Policy), checks caching configuration, counts CORS headers, and warns about information disclosure like exposed X-Powered-By or server version numbers. You can also paste raw headers from curl or server logs and parse them locally.

The XPath Tester evaluates XPath expressions against HTML or XML documents entirely in your browser. Paste your markup, enter an expression, and see every matching node with its type, tag name, text content, and serialized HTML. Use it to debug selectors for web scraping with lxml, Scrapy, or Selenium, or to validate expressions before committing them to your code. Preset buttons cover common patterns like selecting links, images, headings, and elements by class.

Data Extraction

The OpenGraph Checker fetches any URL and extracts all Open Graph and Twitter Card meta tags, then validates them against platform requirements. See live social media previews for Facebook, X/Twitter, LinkedIn, Discord, WhatsApp, and Slack from one check. It scores your tags, flags missing or misconfigured properties, validates your og:image file size and accessibility, and lets you copy the raw meta tags as HTML.

The Cookie Checker fetches a URL and extracts all Set-Cookie headers from the HTTP response, then parses and validates each cookie's attributes. It checks for missing Secure and HttpOnly flags, validates SameSite configuration, decodes URL-encoded values, and flags common security issues. You can also paste raw cookie headers for client-side parsing without sending any data to a server.

The Email Extractor scans any webpage or pasted text for email addresses. It finds emails in mailto links and visible page content, deduplicates the results, groups them by domain, and lets you copy the list as plain text or CSV. Use it to audit which email addresses your own site exposes, extract contacts from directories, or validate your scraping pipeline's output.

The Table Extractor pulls HTML tables from any URL or pasted HTML and converts them to CSV or JSON. It detects all tables on a page, preserves headers and row structure, and lets you download or copy each table individually. Use it for pulling pricing data, sports stats, government datasets, or any structured table published on the web.

Who these tools are for

• Developers building AI agents who need to quickly inspect structured responses, validate payload schemas, or check that a target URL is alive before kicking off a browser session.
• Browser automation engineers debugging response bodies, redirect behavior, or extraction output during workflow development.
• Web scrapers and crawlers doing pre-flight checks on lists of URLs before committing to a larger crawl job.
• Full-stack developers who want a fast utility for the small jobs that interrupt bigger work — format this payload, check those endpoints, inspect this response.

No login required

Every tool on this page works instantly in your browser. There is no account creation, no email signup, and no usage limit for the client-side tools. Tools that require a backend request (like the HTTP Status Checker) use a shared API. Open a tool, use it, move on.

What's coming next

The library is growing. Tools already in development include an HTML viewer for rendering raw markup, HTTP header inspection, a screenshot utility for capturing full-page renders from a URL, and more data extraction utilities.

The selection is driven by search volume and developer demand. Each tool is built with the same goal: remove a specific type of friction from browser automation and debugging workflows.

Frequently Asked Questions