Tools for Developers

Formatters and helper tools reached for often in everyday development work.

A fair share of everyday development work isn't writing code — it's making sense of data you already have, or checking it's valid. JSON Formatter turns a minified blob into something readable, and Regex Tester shows immediately whether a pattern matches what you expect. JWT Decoder exposes the claims inside a token (it decodes, it doesn't verify the signature), while UUID Generator and Hash Generator produce identifiers and digests on demand. Base64 Decoder is a quick way to decode or encode a string, and Cron Expression Generator lets you set up a scheduled job's timing without hand-writing cron syntax. HTML Formatter takes a messy HTML dump and reindents it into something you can actually read.

What are these tools good for?

Most of these are for the moments when you're debugging or wiring up an integration and just want to look at something quickly. They save you from opening an IDE or writing a throwaway script.

JSON Formatter: When an API response lands in your logs as one long line, this makes it readable and points out a missing comma or quote.
Regex Tester: Try a pattern for form validation, log parsing or bulk find-and-replace against real sample text before it goes into code.
JWT Decoder: For auth issues, check the role, user ID and expiry (exp) claims inside a token. Decoding is not verifying, so signature checks still belong on the server.
UUID Generator: For test fixtures, seed files, or database rows you insert by hand.
Hash Generator: Compare whether a config or file content has changed, or check the digest an API expects.
Base64 Decoder: See what's inside a Base64 string from a header, an environment variable or a raw email.
Cron Expression Generator: Write schedules for backups, report emails or cleanup jobs without mixing up the field order.
HTML Formatter: Inspect minified HTML or a single block exported from a CMS, and spot tags that close in the wrong place.

A sample workflow

A webhook integration is failing. You open the one-line request body from the logs in the JSON Formatter and check that the expected fields are there. You paste the token from the Authorization header into the JWT Decoder to see if it has expired. A Base64 field in the payload gets read with the Base64 Decoder. If you need to compare a signature, you hash the same input with the same algorithm in the Hash Generator and compare. Once it's fixed, you write a retry schedule with the Cron Expression Generator.

Tip

Treat production tokens, secret keys and responses with personal data carefully, whatever tool you paste them into. Work with samples from a test environment when you can, or mask sensitive fields first. Also, SHA-1 is no longer recommended for security use, and plain SHA hashes are the wrong choice for storing passwords. Use something built for that job, such as bcrypt or Argon2.