API & Debugging

Inspect requests, understand responses and fix API data.

Start with the developer job in front of you. Every listed utility is published, browser-local, and designed to build, parse or transform data without acting as an API proxy.

Find a workflow HTTP reference

Build requests

Construct request details without sending credentials or payloads.

API Request BuilderBuild starter API request notes and fetch snippets.Open tool →API Header GeneratorGenerate common API request header starters.Open tool →Query String BuilderBuild encoded URLs with arbitrary query parameters while preserving existing queries and fragments.Open tool →URL Encoder / DecoderEncode and decode URL text, components and query strings.Open tool →

Inspect authentication and identifiers

Decode tokens and representations without treating decoded data as verified.

JWT DecoderInspect JWT payloads while debugging auth flows.Open tool →Base64 Encoder / DecoderEncode and decode Base64 strings for API and data work.Open tool →Base64 to FileDecode Base64, detect common file formats and download the exact bytes locally.Open tool →UUID GeneratorGenerate UUID values for local testing and sample data.Open tool →

Transform structured data

Validate, inspect, compare and convert API payloads.

JSON Formatter & ValidatorFormat, validate, minify, sort and inspect JSON in your browser.Open tool →JSON ViewerPreview JSON in a readable starter viewer format.Open tool →JSON Diff CheckerCompare two JSON snippets and list changed keys.Open tool →JSON to YAMLConvert simple JSON objects into YAML-style text.Open tool →YAML to JSONConvert simple YAML-style key values into JSON.Open tool →

Debug responses

Parse headers and investigate values commonly found in API responses.

HTTP Header ParserParse raw request and response headers locally with structured output and sensitive-value warnings.Open tool →Regex TesterCheck regular expressions against sample text.Open tool →Timestamp ConverterConvert Unix timestamps into readable date notes.Open tool →Hash GeneratorGenerate SHA hashes for text and local files in your browser.Open tool →

Quick references

Decode the response or payload terminology before changing working code.

Your API data stays in your browser

These tools build, parse, decode and transform input locally. They do not execute pasted commands, send arbitrary API requests, or upload tokens, headers, bodies and credentials for processing. Redact secrets before sharing copied output.