Revisions to call to smart contract function from express project using web3

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edited Oct 24, 2018 at 19:16

Shane Fontaine

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hi i'mI'm trying to create a API fo my smart contract functions like following:

router.get('/',function (req,res) {
    var web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/key'));
    var DataPassContract = web3.eth.contract(abi);
    var dataPass = DataPassContract.at('contract address');

    dataPass.add('myaddress','a','a','a',{
        from: 'other address'
    }, (err, result) => {
        if (err) throw err;
        if (result) {
                res.send('yes');
            }
    });
});

whenWhen executed i want this function to open metamaskMtamask and ask the client to confirm the transaction but when calling it iI get this error:

if (err) throw err;
                 ^

Error: Invalid JSON RPC response: ""

anyAny help would be appreciated.

hi i'm trying to create a API fo my smart contract functions like following

router.get('/',function (req,res) {
    var web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/key'));
    var DataPassContract = web3.eth.contract(abi);
    var dataPass = DataPassContract.at('contract address');

    dataPass.add('myaddress','a','a','a',{
        from: 'other address'
    }, (err, result) => {
        if (err) throw err;
        if (result) {
                res.send('yes');
            }
    });
});

when executed i want this function to open metamask and ask the client to confirm the transaction but when calling it i get this error

if (err) throw err;
                 ^

Error: Invalid JSON RPC response: ""

any help would be appreciated

I'm trying to create a API fo my smart contract functions like following:

router.get('/',function (req,res) {
    var web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/key'));
    var DataPassContract = web3.eth.contract(abi);
    var dataPass = DataPassContract.at('contract address');

    dataPass.add('myaddress','a','a','a',{
        from: 'other address'
    }, (err, result) => {
        if (err) throw err;
        if (result) {
                res.send('yes');
            }
    });
});

When executed i want this function to open Mtamask and ask the client to confirm the transaction but when calling it I get this error:

if (err) throw err;
                 ^

Error: Invalid JSON RPC response: ""

Any help would be appreciated.

added 16 characters in body

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edited Oct 10, 2018 at 18:02

Rob Hitchens

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146

hi i'm trying to create a API fo my smart contract functions like following

router.get('/',function (req,res) {
    var web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/key'));
    var DataPassContract = web3.eth.contract(abi);
    var dataPass = DataPassContract.at('contract address');

    dataPass.add('myaddress','a','a','a',{
        from: 'other address'
    }, (err, result) => {
        if (err) throw err;
        if (result) {
                res.send('yes');
            }
    });
});

when executed i want this function to open metamask and ask the client to confirm the transaction but when calling it i get this error

if (err) throw err; ^

Error: Invalid JSON RPC response: ""

if (err) throw err;
                 ^

Error: Invalid JSON RPC response: ""

any help would be appreciated

hi i'm trying to create a API fo my smart contract functions like following

router.get('/',function (req,res) {
    var web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/key'));
    var DataPassContract = web3.eth.contract(abi);
    var dataPass = DataPassContract.at('contract address');

    dataPass.add('myaddress','a','a','a',{
        from: 'other address'
    }, (err, result) => {
        if (err) throw err;
        if (result) {
                res.send('yes');
            }
    });
});

when executed i want this function to open metamask and ask the client to confirm the transaction but when calling it i get this error

if (err) throw err; ^

Error: Invalid JSON RPC response: ""

any help would be appreciated

hi i'm trying to create a API fo my smart contract functions like following

router.get('/',function (req,res) {
    var web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/key'));
    var DataPassContract = web3.eth.contract(abi);
    var dataPass = DataPassContract.at('contract address');

    dataPass.add('myaddress','a','a','a',{
        from: 'other address'
    }, (err, result) => {
        if (err) throw err;
        if (result) {
                res.send('yes');
            }
    });
});

when executed i want this function to open metamask and ask the client to confirm the transaction but when calling it i get this error

if (err) throw err;
                 ^

Error: Invalid JSON RPC response: ""

any help would be appreciated

Bumped by Community user

occurred Oct 10, 2018 at 18:01

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occurred Sep 10, 2018 at 1:00

Bumped by Community user

occurred Aug 5, 2018 at 9:01

code formatting

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edit approved Mar 23, 2018 at 11:27

qbsp

4.4k
2
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26

hi i'm trying to create a API fo my smart contract functions like following

router.get('/',function (req,res) { var web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/key')); var DataPassContract = web3.eth.contract(abi); var dataPass = DataPassContract.at('contract address');

dataPass.add('myaddress','a','a','a',{
    from: 'other address'
}, (err, result) => {
    if (err) throw err;
    if (result) {
            res.send('yes');
        }
});

router.get('/',function (req,res) {
    var web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/key'));
    var DataPassContract = web3.eth.contract(abi);
    var dataPass = DataPassContract.at('contract address');

    dataPass.add('myaddress','a','a','a',{
        from: 'other address'
    }, (err, result) => {
        if (err) throw err;
        if (result) {
                res.send('yes');
            }
    });
});

});

when executed i want this function to open metamask and ask the client to confirm the transaction but when calling it i get this error

if (err) throw err; ^

Error: Invalid JSON RPC response: ""

any help would be appreciated

hi i'm trying to create a API fo my smart contract functions like following

router.get('/',function (req,res) { var web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/key')); var DataPassContract = web3.eth.contract(abi); var dataPass = DataPassContract.at('contract address');

dataPass.add('myaddress','a','a','a',{
    from: 'other address'
}, (err, result) => {
    if (err) throw err;
    if (result) {
            res.send('yes');
        }
});

});

when executed i want this function to open metamask and ask the client to confirm the transaction but when calling it i get this error

if (err) throw err; ^

Error: Invalid JSON RPC response: ""

any help would be appreciated

hi i'm trying to create a API fo my smart contract functions like following


router.get('/',function (req,res) {
    var web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/key'));
    var DataPassContract = web3.eth.contract(abi);
    var dataPass = DataPassContract.at('contract address');

    dataPass.add('myaddress','a','a','a',{
        from: 'other address'
    }, (err, result) => {
        if (err) throw err;
        if (result) {
                res.send('yes');
            }
    });
});

when executed i want this function to open metamask and ask the client to confirm the transaction but when calling it i get this error

if (err) throw err; ^

Error: Invalid JSON RPC response: ""

any help would be appreciated

Source Link

asked Mar 23, 2018 at 5:21

Ahmed Ben Rouha

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2

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