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© 2026 Elysia Tools. Developer documentation.

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193 tools in Developer & Web

JSON Diff Visualizer

html

Development

Compare two JSON payloads and render a visual HTML diff with path-level additions, removals, changes, and statistics

json-diff-visualizer

HTML Minifier

text

Development

Compress HTML by removing comments, collapsing whitespace and minifying inline CSS/JS

html-minifier

HTTP/3 QUIC Handshake Anatomy

html

Network

Dissect the HTTP/3 over QUIC handshake byte-by-byte. Visualise the 1-RTT fresh handshake, session-ticket resumption, and 0-RTT early-data scenarios, with sequence diagrams, per-packet field layouts, the Retry packet, and a side-by-side comparison against TCP + TLS 1.3. Built for interview prep, protocol learning, and performance engineering.

http-3-quic-handshake-anatomy

JSONPath REPL Playground

html

Development

An interactive JSONPath REPL that runs multi-step query pipelines against any JSON. Write one JSONPath expression per line (e.g. $..book[?(@.price<10)] then $[0:5]) and see each step's matches with counts, paths, and values — plus a shareable URL that encodes your data and pipeline. Supports recursive descent ($..), wildcards ([*]), filters ([?(@.price<10)]), slices ([0:5:2]), and negative indices.

jsonpath-repl-playground

GraphQL Playground

interactive

Development

An in-browser GraphQL client: write queries and variables, send them to any GraphQL endpoint, and inspect formatted JSON results or error arrays — perfect for iterating on schemas during development

graphql-playground

HTTP Request Tester

interactive

Development

A lightweight in-browser HTTP client (mini Postman): send GET/POST/PUT/DELETE requests with custom headers and body, inspect status, headers, timing, and formatted response — all from your browser

http-request-tester

JSON to C# Class Converter

text

Development

Convert JSON data into C# classes with PascalCase properties, JsonPropertyName attributes, and nested type inference

json-to-csharp

JSON to Go Struct Converter

text

Development

Convert JSON data into Go struct definitions with json struct tags, exported PascalCase fields, and nested type inference

json-to-go

JSON to Java Class Converter

text

Development

Convert JSON data into Java classes with Jackson @JsonProperty annotations, private fields, getters, and setters

json-to-java

JSON to Kotlin Data Class Converter

text

Development

Convert JSON data into Kotlin data classes with @SerializedName annotations, nullable handling, and nested type inference

json-to-kotlin

JSON to Rust Struct Converter

text

Development

Convert JSON data into Rust structs with serde Serialize/Deserialize derives, snake_case fields, and serde rename attributes

json-to-rust

JSON to TypeScript Converter

text

Development

Convert JSON data into TypeScript interfaces or type aliases with union types, optional fields, and nested object inference

json-to-typescript
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