NodeJS , how to send response during Promise .then?
I have the following code:
User.getConfByID(userID)
.then((item)=>{
if(item.length == 0){
res.status(400).json({error:"NO_USER_FOUND"})
}else{
if(item[0].token == token){
if((Math.abs(Date.now() - item[0].conf_iat)) > tokenValid){
res.status(401).json({error: "TOKEN_INVALID"})
}else{
return mariaDBTemplates.updateOneRowTemplate("User_confirmation", {confirmed:1}, "user_id", userID)
}
}else{
res.status(401).json({error: "TOKEN_NOT_SAME"})
}
}
})
.then(()=>{
res.status(200).json({success: "CONFIRMED"})
})
.catch((err)=>{
res.status(500).json({error: err.message})
})
You see I have different kinds of error messages with different kinds of status codes. When I run this code, it always gives me this warning:
Error: Can't set headers after they are sent
I think this is because i don't "break" the Promise after sending a response right?. But how can I solve this? Any suggestions?
Cheerio
node.js promise response
add a comment |
I have the following code:
User.getConfByID(userID)
.then((item)=>{
if(item.length == 0){
res.status(400).json({error:"NO_USER_FOUND"})
}else{
if(item[0].token == token){
if((Math.abs(Date.now() - item[0].conf_iat)) > tokenValid){
res.status(401).json({error: "TOKEN_INVALID"})
}else{
return mariaDBTemplates.updateOneRowTemplate("User_confirmation", {confirmed:1}, "user_id", userID)
}
}else{
res.status(401).json({error: "TOKEN_NOT_SAME"})
}
}
})
.then(()=>{
res.status(200).json({success: "CONFIRMED"})
})
.catch((err)=>{
res.status(500).json({error: err.message})
})
You see I have different kinds of error messages with different kinds of status codes. When I run this code, it always gives me this warning:
Error: Can't set headers after they are sent
I think this is because i don't "break" the Promise after sending a response right?. But how can I solve this? Any suggestions?
Cheerio
node.js promise response
tryreturn
'ing each of theres.status(4xx)
calls
– Robbie
Nov 16 '18 at 13:30
no still the same warning:/
– mcAngular2
Nov 16 '18 at 13:36
seems like you are settingres
twice in the code flow
– JuanDM
Nov 16 '18 at 13:38
add a comment |
I have the following code:
User.getConfByID(userID)
.then((item)=>{
if(item.length == 0){
res.status(400).json({error:"NO_USER_FOUND"})
}else{
if(item[0].token == token){
if((Math.abs(Date.now() - item[0].conf_iat)) > tokenValid){
res.status(401).json({error: "TOKEN_INVALID"})
}else{
return mariaDBTemplates.updateOneRowTemplate("User_confirmation", {confirmed:1}, "user_id", userID)
}
}else{
res.status(401).json({error: "TOKEN_NOT_SAME"})
}
}
})
.then(()=>{
res.status(200).json({success: "CONFIRMED"})
})
.catch((err)=>{
res.status(500).json({error: err.message})
})
You see I have different kinds of error messages with different kinds of status codes. When I run this code, it always gives me this warning:
Error: Can't set headers after they are sent
I think this is because i don't "break" the Promise after sending a response right?. But how can I solve this? Any suggestions?
Cheerio
node.js promise response
I have the following code:
User.getConfByID(userID)
.then((item)=>{
if(item.length == 0){
res.status(400).json({error:"NO_USER_FOUND"})
}else{
if(item[0].token == token){
if((Math.abs(Date.now() - item[0].conf_iat)) > tokenValid){
res.status(401).json({error: "TOKEN_INVALID"})
}else{
return mariaDBTemplates.updateOneRowTemplate("User_confirmation", {confirmed:1}, "user_id", userID)
}
}else{
res.status(401).json({error: "TOKEN_NOT_SAME"})
}
}
})
.then(()=>{
res.status(200).json({success: "CONFIRMED"})
})
.catch((err)=>{
res.status(500).json({error: err.message})
})
You see I have different kinds of error messages with different kinds of status codes. When I run this code, it always gives me this warning:
Error: Can't set headers after they are sent
I think this is because i don't "break" the Promise after sending a response right?. But how can I solve this? Any suggestions?
Cheerio
node.js promise response
node.js promise response
asked Nov 16 '18 at 13:27
mcAngular2mcAngular2
1168
1168
tryreturn
'ing each of theres.status(4xx)
calls
– Robbie
Nov 16 '18 at 13:30
no still the same warning:/
– mcAngular2
Nov 16 '18 at 13:36
seems like you are settingres
twice in the code flow
– JuanDM
Nov 16 '18 at 13:38
add a comment |
tryreturn
'ing each of theres.status(4xx)
calls
– Robbie
Nov 16 '18 at 13:30
no still the same warning:/
– mcAngular2
Nov 16 '18 at 13:36
seems like you are settingres
twice in the code flow
– JuanDM
Nov 16 '18 at 13:38
try
return
'ing each of the res.status(4xx)
calls– Robbie
Nov 16 '18 at 13:30
try
return
'ing each of the res.status(4xx)
calls– Robbie
Nov 16 '18 at 13:30
no still the same warning:/
– mcAngular2
Nov 16 '18 at 13:36
no still the same warning:/
– mcAngular2
Nov 16 '18 at 13:36
seems like you are setting
res
twice in the code flow– JuanDM
Nov 16 '18 at 13:38
seems like you are setting
res
twice in the code flow– JuanDM
Nov 16 '18 at 13:38
add a comment |
1 Answer
1
active
oldest
votes
your problem is with your promise chain. in your first .then
, you always set the response with res
, but the next .then
in the chain tries to set the response again. Note that not returning anything from a promise is the same as return Promise.resolve(undefined);
.
here's how I would do it:
User.getConfByID(userID)
.then((item) => {
if(item.length == 0)
return { statusCode: 400, body: { error: "NO_USER_FOUND" } };
else {
if(item[0].token == token) {
if((Math.abs(Date.now() - item[0].conf_iat)) > tokenValid)
return { statusCode: 401, body: { error: "TOKEN_INVALID" } };
else {
//not sure what this returns, but it looks like this is
//what you're trying to return the 200 for
mariaDBTemplates.updateOneRowTemplate("User_confirmation", { confirmed: 1 }, "user_id", userID);
return { statusCode: 200, body: { success: "CONFIRMED" } };
}
} else
return { statusCode: 401, body: { error: "TOKEN_NOT_SAME" } };
}
})
.then((result) => {
res.status(result.statusCode).json(result.body);
})
.catch((err) => {
res.status(500).json({ error: err.message });
});
Also note that returning a value from a promise is the same as returning Promise.resolve(value);
, and will continue the promise chain.
works thanks:) What if I would have another .then before the .then((result)). ?
– mcAngular2
Nov 17 '18 at 10:07
that would be fine, just make sure that you pass the result through to the next promise: .then((result) => { ...; return result; })
– Andrew Ault
Nov 19 '18 at 13:45
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
your problem is with your promise chain. in your first .then
, you always set the response with res
, but the next .then
in the chain tries to set the response again. Note that not returning anything from a promise is the same as return Promise.resolve(undefined);
.
here's how I would do it:
User.getConfByID(userID)
.then((item) => {
if(item.length == 0)
return { statusCode: 400, body: { error: "NO_USER_FOUND" } };
else {
if(item[0].token == token) {
if((Math.abs(Date.now() - item[0].conf_iat)) > tokenValid)
return { statusCode: 401, body: { error: "TOKEN_INVALID" } };
else {
//not sure what this returns, but it looks like this is
//what you're trying to return the 200 for
mariaDBTemplates.updateOneRowTemplate("User_confirmation", { confirmed: 1 }, "user_id", userID);
return { statusCode: 200, body: { success: "CONFIRMED" } };
}
} else
return { statusCode: 401, body: { error: "TOKEN_NOT_SAME" } };
}
})
.then((result) => {
res.status(result.statusCode).json(result.body);
})
.catch((err) => {
res.status(500).json({ error: err.message });
});
Also note that returning a value from a promise is the same as returning Promise.resolve(value);
, and will continue the promise chain.
works thanks:) What if I would have another .then before the .then((result)). ?
– mcAngular2
Nov 17 '18 at 10:07
that would be fine, just make sure that you pass the result through to the next promise: .then((result) => { ...; return result; })
– Andrew Ault
Nov 19 '18 at 13:45
add a comment |
your problem is with your promise chain. in your first .then
, you always set the response with res
, but the next .then
in the chain tries to set the response again. Note that not returning anything from a promise is the same as return Promise.resolve(undefined);
.
here's how I would do it:
User.getConfByID(userID)
.then((item) => {
if(item.length == 0)
return { statusCode: 400, body: { error: "NO_USER_FOUND" } };
else {
if(item[0].token == token) {
if((Math.abs(Date.now() - item[0].conf_iat)) > tokenValid)
return { statusCode: 401, body: { error: "TOKEN_INVALID" } };
else {
//not sure what this returns, but it looks like this is
//what you're trying to return the 200 for
mariaDBTemplates.updateOneRowTemplate("User_confirmation", { confirmed: 1 }, "user_id", userID);
return { statusCode: 200, body: { success: "CONFIRMED" } };
}
} else
return { statusCode: 401, body: { error: "TOKEN_NOT_SAME" } };
}
})
.then((result) => {
res.status(result.statusCode).json(result.body);
})
.catch((err) => {
res.status(500).json({ error: err.message });
});
Also note that returning a value from a promise is the same as returning Promise.resolve(value);
, and will continue the promise chain.
works thanks:) What if I would have another .then before the .then((result)). ?
– mcAngular2
Nov 17 '18 at 10:07
that would be fine, just make sure that you pass the result through to the next promise: .then((result) => { ...; return result; })
– Andrew Ault
Nov 19 '18 at 13:45
add a comment |
your problem is with your promise chain. in your first .then
, you always set the response with res
, but the next .then
in the chain tries to set the response again. Note that not returning anything from a promise is the same as return Promise.resolve(undefined);
.
here's how I would do it:
User.getConfByID(userID)
.then((item) => {
if(item.length == 0)
return { statusCode: 400, body: { error: "NO_USER_FOUND" } };
else {
if(item[0].token == token) {
if((Math.abs(Date.now() - item[0].conf_iat)) > tokenValid)
return { statusCode: 401, body: { error: "TOKEN_INVALID" } };
else {
//not sure what this returns, but it looks like this is
//what you're trying to return the 200 for
mariaDBTemplates.updateOneRowTemplate("User_confirmation", { confirmed: 1 }, "user_id", userID);
return { statusCode: 200, body: { success: "CONFIRMED" } };
}
} else
return { statusCode: 401, body: { error: "TOKEN_NOT_SAME" } };
}
})
.then((result) => {
res.status(result.statusCode).json(result.body);
})
.catch((err) => {
res.status(500).json({ error: err.message });
});
Also note that returning a value from a promise is the same as returning Promise.resolve(value);
, and will continue the promise chain.
your problem is with your promise chain. in your first .then
, you always set the response with res
, but the next .then
in the chain tries to set the response again. Note that not returning anything from a promise is the same as return Promise.resolve(undefined);
.
here's how I would do it:
User.getConfByID(userID)
.then((item) => {
if(item.length == 0)
return { statusCode: 400, body: { error: "NO_USER_FOUND" } };
else {
if(item[0].token == token) {
if((Math.abs(Date.now() - item[0].conf_iat)) > tokenValid)
return { statusCode: 401, body: { error: "TOKEN_INVALID" } };
else {
//not sure what this returns, but it looks like this is
//what you're trying to return the 200 for
mariaDBTemplates.updateOneRowTemplate("User_confirmation", { confirmed: 1 }, "user_id", userID);
return { statusCode: 200, body: { success: "CONFIRMED" } };
}
} else
return { statusCode: 401, body: { error: "TOKEN_NOT_SAME" } };
}
})
.then((result) => {
res.status(result.statusCode).json(result.body);
})
.catch((err) => {
res.status(500).json({ error: err.message });
});
Also note that returning a value from a promise is the same as returning Promise.resolve(value);
, and will continue the promise chain.
answered Nov 16 '18 at 13:58
Andrew AultAndrew Ault
715
715
works thanks:) What if I would have another .then before the .then((result)). ?
– mcAngular2
Nov 17 '18 at 10:07
that would be fine, just make sure that you pass the result through to the next promise: .then((result) => { ...; return result; })
– Andrew Ault
Nov 19 '18 at 13:45
add a comment |
works thanks:) What if I would have another .then before the .then((result)). ?
– mcAngular2
Nov 17 '18 at 10:07
that would be fine, just make sure that you pass the result through to the next promise: .then((result) => { ...; return result; })
– Andrew Ault
Nov 19 '18 at 13:45
works thanks:) What if I would have another .then before the .then((result)). ?
– mcAngular2
Nov 17 '18 at 10:07
works thanks:) What if I would have another .then before the .then((result)). ?
– mcAngular2
Nov 17 '18 at 10:07
that would be fine, just make sure that you pass the result through to the next promise: .then((result) => { ...; return result; })
– Andrew Ault
Nov 19 '18 at 13:45
that would be fine, just make sure that you pass the result through to the next promise: .then((result) => { ...; return result; })
– Andrew Ault
Nov 19 '18 at 13:45
add a comment |
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try
return
'ing each of theres.status(4xx)
calls– Robbie
Nov 16 '18 at 13:30
no still the same warning:/
– mcAngular2
Nov 16 '18 at 13:36
seems like you are setting
res
twice in the code flow– JuanDM
Nov 16 '18 at 13:38