Developer topic guide
API debugging tools
Format API responses, build cURL commands, and check HTTP status—free API debugging in your browser.
Topic guides
Browse focused guides that compare related tools and link to the best starting point for your task.
- JSON toolsFormat, validate, compare, and convert JSON with free developer utilities in your browser.
- JWT toolsDecode, encode, and generate JSON Web Tokens in your browser with Utilnivo JWT tools.
- Encoding toolsBase64, URL, and HTML encoding utilities for developers — free and browser-based.
- FormattersFormat and minify HTML, CSS, JavaScript, SQL, XML, YAML, and Markdown in your browser.
- Network toolsDNS, WHOIS, SSL, HTTP headers, and cURL helpers for quick network debugging in your browser.
- Security toolsHash, checksum, and regex utilities for developers — free browser-based security helpers.
- UUID toolsGenerate and decode UUIDs with free developer tools in your browser.
- Best free developer toolsBest free developer tools for JSON, JWT, Base64, passwords, UUIDs, QR codes, and hashes—pros, cons, and when to use each Utilnivo utility.
- Developer debugging toolsFormat JSON, decode JWTs, test regex, compare payloads, and build cURL commands—free browser debugging utilities for developers.
- API debugging toolsFormat API responses, build cURL commands, and check HTTP status—free API debugging in your browser.
- Data format convertersConvert CSV, JSON, and XML; view tables—free data conversion tools for developers in your browser.
- XML processing toolsFormat, validate, and compare XML documents—free XML utilities in your browser.
- Checksum and encoding toolsGenerate hashes, encode Base64, and create UUIDs—free encoding utilities in your browser.
Tools in this guide
Overview
API debugging tools reproduce requests, pretty-print responses, and inspect tokens during integration work. This topic guide groups Utilnivo tools so you can move from rough estimates to a concrete next step without hunting across categories.
Start with the tool that matches your immediate question—api response formatter, curl builder, curl formatter, json compare, jwt decoder—then open related tools when you need comparisons, exports, or follow-up checks.
Outputs are educational. Confirm numbers with professionals, instructors, or platform requirements before you sign, submit, or publish.
How to choose
- Api Response Formatter → api-response-formatter.
- Curl Builder → curl-builder.
- Curl Formatter → curl-formatter.
- Json Compare → json-compare.
- Jwt Decoder → jwt-decoder.
Frequently asked questions
Who is API debugging tools for?
Backend and full-stack developers tracing failing endpoints. Use the how-to-choose list to pick the right tool for your task.
Are these tools free?
Yes. Utilnivo tools are free for standard browser use with no account required.
Is my data stored online?
Calculations and file processing for standard tools run locally in your browser unless a page explicitly performs a network lookup.
Step-by-step workflows (2)
Multi-step guides that chain tools from this topic—follow numbered steps instead of guessing tool order.