Developer Tools.

Developer tools that live in your browser are genuinely useful precisely because they are always available. No installation, no PATH configuration, no version conflicts with other projects. You get a minified JSON response from an API, paste it into the formatter, and instantly see a readable tree. You want to test a regular expression before adding it to your codebase, so you open the regex tester and iterate in real time. These are the small frictions that slow down development, and removing them adds up over a full working day.

JSON is everywhere: API responses, configuration files, log output, database exports. The JSON formatter prettifies minified JSON with proper indentation and syntax highlighting, making it readable at a glance. The JSON tree viewer shows deeply nested structures as a collapsible hierarchy, so you can navigate to the specific field you need without scrolling through hundreds of lines. The JSON path finder evaluates JSONPath expressions against your data interactively, which is invaluable when you need to reference a nested value in code but are not sure of the exact path syntax.

Data transformation is a daily reality for backend developers and data engineers. The JSON-to-CSV and CSV-to-JSON converters handle both directions without requiring a spreadsheet application or a Python script. JSON-to-XML and YAML-to-JSON cover the other common format conversions. The diff checker shows line-by-line differences between two text blocks, useful for comparing API responses, config files, or any two versions of structured data.

Encoding and decoding tools cover the standards that appear constantly in web development. Base64 encoding is used in data URIs, HTTP Basic auth headers, and email attachments. URL encoding is required for query parameters containing special characters. HTML entity encoding matters whenever you are inserting user-generated content into HTML. The JWT decoder splits a JSON Web Token into its three parts and decodes the header and payload without needing the secret, which is useful for inspecting tokens during debugging without exposing credentials.

The regex tester deserves special attention because regular expressions are notoriously hard to write correctly. The tool shows matches highlighted in real time as you type, displays all capture groups, and lets you test against multiple input strings simultaneously. The cron parser is equally useful: cron expressions are powerful but cryptic, and the parser translates any expression into a plain description of when it will run, along with the next several scheduled times.

Code formatting and minification tools cover SQL, HTML, CSS, JavaScript, and XML. Formatters are useful when you receive code from external sources that lacks indentation, or when you want to inspect minified production code. Minifiers prepare code for production by removing whitespace and comments, reducing file size for transmission. The chmod calculator translates Unix file permission values between octal notation and the symbolic read/write/execute format, saving you from looking up permission tables every time you need them.

All tools run entirely in your browser. This means you can safely paste API tokens, private configuration values, JWT tokens containing user data, or any other sensitive developer information without worrying about server-side logging or data retention. The tools work offline once the page has loaded, which is useful in environments with restricted internet access or when you are developing on a plane.