Haskell JSON Parser

A small JSON parser written in Haskell, based on the Coding Challenges challenge series by John Crickett. The project explores building a parser from combinators rather than relying on a JSON parsing library.

What it does

• Defines a minimal parser type that consumes a String and returns either a parsed value with the remaining input or failure.
• Builds JSON-oriented parsers for objects, arrays, strings, numbers, and the true, false, and null literals.
• Represents parsed JSON values with a small set of Haskell data types in Main.hs.

This is an in-progress learning project, not a complete or standards-compliant JSON implementation. In particular, string escapes and full JSON number validation are not implemented yet. The current program reads test.json and prints parser output; the sample files under jsons/ are not currently run as an automated test suite.

Files

• Parser.hs — parser combinators and the Parser type.
• Main.hs — JSON value types, JSON parsers, and the executable entry point.
• test.json — input read by the current executable.
• jsons/ — sample JSON inputs retained in the repository.

Run

Requires GHC.

ghc Main.hs -o hjp
./hjp

The executable expects to be run from the repository root because it reads test.json using a relative path.