I am trying to create a transaction on the bitcoin testnet, using bitcore:

Error Message :

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

Here is my code:

var transaction = new bitcore.Transaction()
.to('mjsVogqLetdUjT9raJY6WgYmy3tifJ3DJz', 20000)

<Transaction: 010000000122195e38df0ff2ec2b78d41a3857aa2125bf923a829461a774e7072fd99a0d0c0000000000ffffffff02204e0000000000001976a9142fc320597ba67a66167721bc9c36d987e03c225b88ac10cd0e00000000001976a91412820fdb8340e5198b3c31de5688faa7927b0d7188ac00000000>


>> var Insight = require('bitcore-explorers')
[object Object]
>> var client = new Insight.Insight()
[object Object]
>> client.broadcast(transaction, function(err, txId) { console.log('Id:', txId, err);})
Id: undefined SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

When I try to broadcast this transaction using BlockCypher, the error message is :

Error validating transaction: Rejected script for input 0 referencing 0c0d9ad92f07e774a76194823a92bf2521aa57381ad4782becf20fdf385e1922 at 0.

Any help is highly appreciated!

  • I checked your JSON and it is valid. What is the value of txId?
    – Scott
    Apr 19, 2015 at 2:08
  • Are you allowed to set the change address after signing? The example they give has signing after setting the change address. github.com/bitpay/bitcore-explorers/blob/… Also, I looked at the deserialized transaction in blockchain.info/decode-tx and it's not signed.
    – Nick ODell
    Apr 19, 2015 at 8:36
  • txId is returned undefined, and an error instead. Also I tried signing later, still doesn't work. The privateKey in WIF is also pasted above. Could you guys, please try running the above code in bitcore playground, would only take seconds?
    – Kang
    Apr 19, 2015 at 8:49
  • @Kang Sorry, didn't notice that link before. Shouldn't you be passing a private key to sign()? github.com/bitpay/bitcore/blob/…
    – Nick ODell
    Apr 19, 2015 at 9:29
  • But that is, the private key in WIF..
    – Kang
    Apr 19, 2015 at 10:04

1 Answer 1


I think you can add ' around your JSON, to make :.from('{"address":"..."}') to create a string with your json inside

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