9 developer-grade utilities for JSON, XML, SQL, YAML, JWTs, Base64 and files
Data rarely arrives in the shape you need it: JSON comes minified into one unreadable line, tokens are opaque Base64 blobs, SQL queries lose their structure in logs, and someone always emails a file in the wrong format. This category is the toolbox for those moments — formatters, converters and inspectors that make data legible and portable.
These tools are built for developers but need no setup: everything runs in the browser, which also means API responses, tokens and queries you paste stay on your machine. That's especially important for JWTs and production data — decoding here doesn't leak anything to a third-party server.
Inspect every character in a string with its Unicode name and code point — the fastest way to find invisible or lookalike characters. Open the Unicode Analyzer →
Decode JSON Web Tokens into header and payload locally — inspect claims and expiry without sending the token anywhere. Open the JWT Decoder →
How to Choose the Right Tool
The JSON Formatter pretty-prints, validates and minifies JSON — probably the most-reached-for tool here. XML and SQL Formatters do the same for their languages, and the YAML Converter translates between YAML and JSON. The JWT Decoder splits a token into header, payload and signature so you can inspect claims safely offline. Image to Base64 embeds images as data URIs; the Unicode Analyzer names every character in a string (great for hunting invisible characters); the File Size Checker reports exact byte sizes; and the Format Converter moves data between common file formats.
Frequently Asked Questions
Is it safe to paste API responses and tokens here?
Yes — everything is parsed locally in your browser. Nothing you paste is transmitted, which is exactly why local tools are recommended for JWTs.
Does the JSON formatter validate syntax?
Yes — it reports parse errors with position information, then formats or minifies valid JSON.
Can the JWT decoder verify signatures?
It decodes and displays header and payload; signature verification requires the signing key and is out of scope for an offline inspector.
What's the largest file or text these tools handle?
They comfortably handle multi-megabyte inputs; the practical ceiling is your device's memory since processing is local.
Explore More WiserWork Categories
WiserWork offers 295 free browser-based tools across 22 categories — all private, all free, no sign-up required.