Working with APIs, configs and data means repetitive tasks: formatting JSON, inspecting a JWT, generating a password or UUID, encoding a URL or checking a hash. Having free tools that don’t require sign-up or installation saves time and avoids extra software.
Format and validate JSON
API responses usually come as JSON. An online JSON formatter lets you paste the response, see the structure with indentation and catch syntax errors (trailing commas, wrong quotes). It often also minifies to reduce size. Useful when debugging integrations or reviewing configs.
Decode JWT
JWTs (JSON Web Tokens) carry header and payload in Base64URL. A JWT decoder shows the content without manual decoding or trusting the token (it only displays; your backend must verify the signature). Good for checking claims, expiration and auth debugging.
Generate passwords and UUIDs
A password generator with length and character options helps create strong passwords for accounts or environments. A UUID generator returns unique identifiers (v4) for APIs, databases or tests. Both can run in the browser without sending values to a server.
Base64, URL encode and hashes
- Base64: encode or decode text or binary; useful for data URLs, JWT or API payloads.
- URL encode/decode: prepare parameters for query strings or paths without breaking the URL.
- Hash generator: get SHA-256 or other hashes to verify file integrity, docs or tests.
QR codes
A QR code generator that supports URL, WiFi, vCard, etc. lets you create codes for links, networks or contacts without installing anything.
Choosing a tool suite that groups a JSON formatter, JWT decoder, password generator, UUID, Base64, URL encode, hashes and QR in one place—and in your language—keeps your workflow fast and dependency-free.