Guides
Overview
A focused list of articles for JWT Secret basics, sizing, NextAuth setup, API key handling, Base64, UUIDs, UNIX timestamps, YAML / JSON, certificates, subnet masks, placeholder images, and character and word counting.
Start with the role of the secret, move on to length guidance or conversion basics, or jump straight to usage steps for the character and word counter and other tools. The list is ordered so the most common questions are easiest to find.
All guides
What is a JWT Secret?
A short guide to the secret used for JWT signing and verification, and where it should live.
How long should a JWT Secret be?
A practical baseline for JWT Secret length, plus the parts that matter more than character count.
How to generate a NextAuth Secret
A practical workflow for generating and using the secret required by NextAuth setups.
What is an API Key?
A practical guide to the role of API keys in integrations, and how to handle them safely.
How to use the JWT Decoder
A short guide to inspecting the Header, Payload, Signature, standard claims, and expiry status of a JWT.
How to create placeholder images
A practical guide to making placeholder images for mockups and layout checks from a size and a short line of copy.
How to use the character and word counter
A practical guide to checking character count, word count, line count, and UTF-8 bytes while refining copy or input limits.
How to use the Case Converter
A practical guide to choosing between uppercase, lowercase, camelCase, snake_case, kebab-case, and related text formats.
How to use Hiragana / Katakana conversion
A practical guide to normalizing Japanese kana between hiragana and katakana.
How to use the YAML / JSON Converter
A practical guide to converting configuration files and API-shaped data between YAML and JSON.
How to use the SSL Certificate Viewer
A practical guide to inspecting PEM certificates for validity, issuers, and fingerprints.
How to use the Subnet Mask Calculator
A practical guide to converting between CIDR and subnet masks and checking the network range.
How to use the Base64 Encoder
A practical guide to encoding text as Base64 and decoding it back again.
How to use the UUID Generator
A practical guide to using UUIDs for temporary IDs and test data.
How to use the UNIX Timestamp Converter
A practical guide to checking seconds, milliseconds, and time zones when converting between date-times and UNIX timestamps.
How to make a URL-safe token
A practical guide to choosing a token format that is easy to share inside URLs, invite links, and reset links.