relaxed-json

Relaxed JSON

Are you frustrated that you cannot add comments into your configuration JSON Relaxed JSON is a simple solution. Small JavaScript library with only one exposed function RJSON.transform(text : string) : string (and few convenient helpers).

Relaxed JSON (modified BSD license) is a strict superset of JSON, relaxing strictness of valilla JSON. Valid, vanilla JSON will not be changed by RJSON.transform. But there are few additional features helping writing JSON by hand.

• Comments are stripped : // foo and /* bar */ → . Comments are converted into whitespace, so your formatting is preserved.
• Trailing comma is allowed : [1, 2, 3, ] → [1, 2, 3]. Works also in objects { "foo": "bar", } → { "foo": "bar" }.
• Identifiers are transformed into strings : { foo: bar } → { "foo": "bar" }.
• Single quoted strings are allowed : 'say "Hello"' → "say \"Hello\"".
• More different characters is supported in identifiers: foo-bar → "foo-bar".

API

• RJSON.transform(text : string) : string. Transforms Relaxed JSON text into JSON text. Doesn't verify (parse) the JSON, i.e result JSON might be invalid as well
• RJSON.parse(text : string, reviver : function | opts : obj) : obj. Parse the RJSON text, virtually JSON.parse(JSON.transform(text), reviver). You could pass a reviver function or an options object as the second argument. Supported options:
  • reviver: you could still pass a reviver
  • relaxed: use relaxed version of JSON (default: true)
  • warnings: use relaxed JSON own parser, supports better error messages (default: false).
  • duplicate: fail if there are duplicate keys in objects