Useful Developer Tools Every Browser Should Have

Small developer utilities save time during debugging, testing, documentation, and API work. A good toolkit should be fast, simple, and easy to use without account creation.

Common tasks include formatting JSON, decoding Base64, generating UUIDs, comparing text, cleaning strings, and checking colors.

Paste API responses into a JSON Formatter to catch syntax errors and read nested structures. Invalid JSON usually means a trailing comma, single quotes, or truncated payload.

Pair formatting with Text Diff when comparing two API responses or config versions.

JWT Decoder helps inspect header and payload claims during auth debugging — decoding is not verification; signatures must be checked on a trusted server.

Base64 Encoder/Decoder is for transport-safe text, not security. UUID Generator creates test identifiers without a backend round trip.

Most DevToolKit developer utilities run locally in the browser. That helps for quick checks, but avoid pasting production secrets on shared machines.

Treat tokens, API keys, and customer data as sensitive even when processing stays local.

Open the Developer Workbench for grouped tools: format and validate, encode and decode, tokens and security, regex and text, and general helpers.

Use related guides on JSON formatting and everyday browser utilities for deeper walkthroughs.