JSON Formatter
Featured
Format, minify, and validate JSON with optional key sorting.
- On your device
- No signup
Topical hub
Developer debugging tools
Format JSON, decode JWTs, test regex, compare payloads, and build cURL commands—free browser debugging utilities for developers.
10 free tools in this guide — pick one below to get started.
Tools in this guide(10)
Open a tool to calculate, convert, or edit — no signup required.
JSON Validator
Featured
Validate JSON syntax and show parse errors.
- On your device
- No signup
JSON Compare
Featured
Compare two JSON documents and list structural differences.
- On your device
- No signup
JWT Decoder
Featured
Decode JWT header, payload, and expiry—including Bearer tokens—on your device.
- On your device
- No signup
JWT Expiry Checker
Featured
Check if a JWT is expired and when it expires in your timezone.
- On your device
- No signup
Regex Tester
Featured
Test regular expressions against sample text.
- On your device
- No signup
Base64 Encoder & Decoder
Featured
Encode and decode text with Base64.
- On your device
- No signup
Hash Generator
Featured
Generate SHA-256, SHA-384, and SHA-512 hashes.
- On your device
- No signup
cURL Builder
Featured
Build curl commands from method, URL, headers, and body.
- On your device
- No signup
XML Formatter
Featured
Format, minify, and validate XML with readable indentation.
- On your device
- No signup
Overview
Debugging sessions bounce between formats: pretty-printing API JSON, inspecting JWT claims, testing regex against log lines, and reproducing requests in cURL. This hub groups the utilities developers open first when a integration misbehaves.
JSON Formatter and JSON Validator clean up responses; JSON Compare diffs staging vs production payloads. JWT Decoder exposes header and payload without claiming signature verification. Regex Tester, Base64 Encoder, and Hash Generator handle small encoding puzzles. cURL Builder turns UI actions into reproducible terminal commands.
Use the Debug JWT token workflow when you are tracing OAuth or API gateway tokens step by step. Pair network lookups in the Network tools guide when DNS or TLS is suspect.
How to choose
- Messy API JSON → JSON Formatter.
- Invalid JSON error → JSON Validator.
- Environment diff → JSON Compare.
- Bearer token → JWT Decoder.
- Pattern in logs → Regex Tester.
- Reproduce HTTP call → cURL Builder.
Frequently asked questions
Does JWT Decoder verify signatures?
It shows structure for debugging. Verification belongs in your backend with proper keys.
Is my JSON sent to a server?
These developer tools run on your device unless a page explicitly performs a lookup.
What about HTTP header inspection?
Use HTTP Header Checker in the SEO launch checklist hub when you need live response headers.
Step-by-step workflows (1)
Multi-step guides that chain tools from this topic—follow numbered steps instead of guessing tool order.