javascript - JSON.parse failing without reason -

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i using nodejs, , following json.parse failing cant work out why:

> s[0] '[["hands[0].session.buyin", "332"]]' > json.parse(s[0]); syntaxerror: unexpected token      @ object.parse (native)     @ repl:1:6     @ replserver.self.eval (repl.js:110:21)     @ repl.js:249:20     @ replserver.self.eval (repl.js:122:7)     @ interface.<anonymous> (repl.js:239:12)     @ interface.eventemitter.emit (events.js:95:17)     @ interface._online (readline.js:202:10)     @ interface._line (readline.js:531:8)     @

the string in question has been loaded file. if copy past string console works, suspicion might way file encoded, cant work out what. json.parse's error messages distinctly unhelpful.

it seem string includes byte-order mark.

> s[0].charcodeat(0).tostring(16) 'feff'

you'll have strip that out before json.parse() can manage rest.

> json.parse(s[0].trim()) [ [ 'hands[0].session.buyin', '332' ] ]

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