15 developer tools every coder needs

Minified JSON from an API response or a log file is unreadable. Paste it in, get it formatted and validated. Highlights syntax errors so you can spot the unclosed bracket or missing comma.

Base64 shows up in email attachments, JWT payloads, data URIs, environment variables, and API tokens. Encode plain text or decode a base64 string back to readable content.

Verify a file checksum, generate a hash for a cache key, or test a hashing function. Computes MD5, SHA-1, SHA-256, and SHA-512 from any text input. Nothing leaves your browser.

Shows matches in real time as you type your pattern. Set flags (global, case-insensitive, multiline) and see which groups are capturing what. No more guessing.

Splits the header, payload, and signature and displays each part formatted. Debug auth issues without needing a library or Postman open.

Produces v4 UUIDs on demand, as many as you need, with a copy button for each. For test fixtures, migration scripts, or seed files.

Query strings with special characters, percent-encoded redirect URLs, or form data that needs encoding before hitting an API. Handles both directions.

Spreadsheet exports come as CSV. When your code expects JSON, this handles the transformation without writing a parser or opening Python.

The other direction: API responses that need to go into a spreadsheet. Flattens a JSON array into rows and columns.

Strong random passwords for test accounts, local databases, or service configs. Set length and character set. Generated locally, never touches a server.

Copy-pasting from a webpage into a markdown doc usually requires cleanup. This handles the conversion so you clean up the result rather than reformat from scratch.

Compare two blocks of text, two config file versions, or two API responses to find what changed. Highlights additions and deletions line by line.

Turn a title or arbitrary string into a URL-safe slug. Handles Unicode characters, strips punctuation, converts spaces to hyphens.

Convert between HEX, RGB, HSL, and HSB. Takes any format and outputs the others. Useful for design tokens or CSS variables.

Log files and API responses often contain Unix timestamps. Converts between epoch seconds and human-readable dates, with timezone support.