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1 files changed, 37 insertions, 0 deletions

diff --git a/src/python/stdlib/json/tool.py b/src/python/stdlib/json/tool.py
new file mode 100644
index 0000000..c37bb77
--- /dev/null
+++ b/src/python/stdlib/json/tool.py
@@ -0,0 +1,37 @@
+r"""Command-line tool to validate and pretty-print JSON
+
+Usage::
+
+    $ echo '{"json":"obj"}' | python -m json.tool
+    {
+        "json": "obj"
+    }
+    $ echo '{ 1.2:3.4}' | python -m json.tool
+    Expecting property name: line 1 column 2 (char 2)
+
+"""
+import sys
+import json
+
+def main():
+    if len(sys.argv) == 1:
+        infile = sys.stdin
+        outfile = sys.stdout
+    elif len(sys.argv) == 2:
+        infile = open(sys.argv[1], 'rb')
+        outfile = sys.stdout
+    elif len(sys.argv) == 3:
+        infile = open(sys.argv[1], 'rb')
+        outfile = open(sys.argv[2], 'wb')
+    else:
+        raise SystemExit(sys.argv[0] + " [infile [outfile]]")
+    try:
+        obj = json.load(infile)
+    except ValueError, e:
+        raise SystemExit(e)
+    json.dump(obj, outfile, sort_keys=True, indent=4)
+    outfile.write('\n')
+
+
+if __name__ == '__main__':
+    main()