Implement API with Rocket

Author: Joe Chung

.github/copilot-instructions.md

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+# Copilot Instructions for json-rs
+
+## Project Overview
+
+This is a Rust monorepo for a JSON parser ported from TypeScript. It consists of three main crates:
+
+- **shared-lib**: Core library for parsing and representing JSON.
+- **cli**: Command-line interface for parsing JSON from stdin.
+- **api-rocket**: HTTP API server exposing JSON parsing via Rocket.
+
+## Workspace Structure
+
+- `shared-lib/`: Contains parsing logic and types. Exposes `parse`, `Json`, `ValueToken`, and `pretty_print_token`.
+- `cli/`: Reads JSON from stdin, parses it using shared-lib, and prints a pretty-formatted result or error.
+- `api-rocket/`: Provides a POST `/api/v1/parse` endpoint. Accepts plain text JSON, returns pretty-printed output or error JSON.
+- `testdata/`: Contains `.rest` files for API testing with VSCode REST Client.
+
+## Build, Test, Format, Lint
+
+- Build all crates: `cargo build --workspace`
+- Test all crates: `cargo test --workspace`
+- Format: `cargo fmt`
+- Lint: `cargo clippy -p cli -p shared-lib --all-targets --all-features`
+
+## Usage
+
+- **CLI**: `cargo run --package cli < input.json` or enter JSON manually.
+- **API**: `cargo run --package api-rocket` (default: http://localhost:8000). Test with `.rest` files in `testdata/`.
+
+## Coding Conventions
+
+- Use types and parsing functions from shared-lib.
+- Prefer workspace-level commands for build/test.
+- Add new features as modules in shared-lib if they relate to JSON parsing.
+- For API changes, update Rocket routes in api-rocket.
+- For CLI changes, update main.rs in cli.
+
+## Copilot Agent Guidance
+
+- When processing Copilot requests, follow Rust best practices and workspace conventions.
+- For parsing logic, use or extend shared-lib.
+- For CLI/API features, ensure integration with shared-lib.
+- Add tests in shared-lib/tests or appropriate crate.
+- Use `.rest` files in testdata/ for API testing.
+- Reference README.md for additional details.