Added JSON support. (0.28.0)

examples/data/complex.json

@@ -0,0 +1,53 @@
+{
+  "project": {
+    "name": "Fun",
+    "version": "0.27.2",
+    "website": "https://fun-lang.xyz",
+    "license": {
+      "name": "Apache-2.0",
+      "url": "https://opensource.org/license/apache-2-0"
+    }
+  },
+  "features": {
+    "enabled": ["arrays", "maps", "json", "pcsc"],
+    "experimental": {
+      "repl": true,
+      "sockets": true,
+      "odbc": false,
+      "notes": null
+    }
+  },
+  "users": [
+    {
+      "id": 1,
+      "name": "Ada",
+      "roles": ["admin", "math"],
+      "active": true,
+      "score": 99.5,
+      "prefs": {
+        "theme": "dark",
+        "editor": {"tabWidth": 2, "font": "Fira Code"}
+      }
+    },
+    {
+      "id": 2,
+      "name": "Linus",
+      "roles": ["user", "kernel"],
+      "active": false,
+      "score": 88,
+      "prefs": {
+        "theme": "light",
+        "editor": {"tabWidth": 8, "font": "Monospace"}
+      }
+    }
+  ],
+  "metrics": {
+    "counters": [0, 1, 1, 2, 3, 5, 8],
+    "latency_ms": {"p50": 1.23, "p90": 3.21, "p99": 12.34},
+    "builds": 1234567890123456789,
+    "last_release_ts": 1732406400000
+  },
+  "matrix": [[1, 2, 3], [4, 5, 6], [7, 8, 9]],
+  "notes": "UTF-8 ✓ – emojis: 🚀🔥",
+  "null_field": null
+}

examples/json_showcase.fun

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+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-11-24
+ */
+
+// Demonstrates JSON.parse/stringify/from_file/to_file via the stdlib JSON class.
+
+include <io/json.fun>
+
+json = JSON()
+
+print("-- JSON: parse from string and pretty print --")
+
+// Build a sample JSON text with most value types
+sample = '{"name":"Ada","active":true,"score":99.5,"count":42,"tags":["C","Ada","Math"],"extra":null}'
+obj = json.parse(sample)
+print("Dump:")
+print(obj)
+print(obj["name"])         // Ada
+print(obj["active"])       // 1
+print(obj["count"])        // 42
+print(len(obj["tags"]))    // 3
+
+pretty = json.stringify(obj, 1)
+print(pretty)
+
+print("-- JSON: load from file, inspect, and save pretty to /tmp --")
+
+// Load non existent json file
+path = "examples/data/nonexistent.json"
+cfg = json.from_file(path)
+print("Dump:")
+print(cfg)
+
+// Load a more complex example shipped with the repo
+path = "examples/data/complex.json"
+cfg = json.from_file(path)
+print("Dump:")
+print(cfg)
+
+// Access nested fields
+print(cfg["project"]["name"])         // project name
+print(cfg["project"]["version"])      // version string
+print(len(cfg["users"]))               // number of users
+
+// Derive a small summary map
+summary = {}
+summary["user_count"] = len(cfg["users"]) 
+summary["first_user_name"] = cfg["users"][1]["name"]
+summary["features_enabled"] = cfg["features"]["enabled"]
+
+print(json.stringify(summary, 1))
+
+// Write the loaded config back as pretty JSON
+out_path = "/tmp/fun_complex_out.json"
+ok = json.to_file(out_path, cfg, 1)
+print(ok) // 1 on success