Spring + React fetch data
1
i have a problem with fetch data from api exposed by spring.
I want to fetch data by:
componentDidMount() {
this.setState({isLoading: true});
fetch('http://localhost:8080/api/tasks/')
.then(response => { return response.json() })
.then(results => this.setState({
tasks: results,
isLoading: false
}));
The spring api which return data:
@CrossOrigin(origins = "http://localhost:3000")
@GetMapping
public List<Task> findTasksByUserId() {
return taskService.findTasksBelongToUser(idProvider.getCurrentUserId());
}
Returned JSON:
[
{
id: 1,
version: 0,
name: "Task1",
description: "description1",
priority: 1,
finished: true,
category: {
id: 1,
version: 0,
name: "Uncategorized",
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
}
},
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
},
position: 0
},
{
id: 2,
version: 0,
name: "Task2",
description: "description2",
priority: 4,
finished: true,
category: {
id: 1,
version: 0,
name: "Uncategorized",
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
}
},
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
},
position: 1
}]
And i got a error like this:
Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0
I dont know what is wrong but maybe format of json is not correct, because it's start with the sign '['.
I am a beginner in React so please about some hint and help.
regards
json spring reactjs api
asked Nov 14 '18 at 18:18
AdrianAdrian
328
add a comment |
1
i have a problem with fetch data from api exposed by spring.
I want to fetch data by:
componentDidMount() {
this.setState({isLoading: true});
fetch('http://localhost:8080/api/tasks/')
.then(response => { return response.json() })
.then(results => this.setState({
tasks: results,
isLoading: false
}));
The spring api which return data:
@CrossOrigin(origins = "http://localhost:3000")
@GetMapping
public List<Task> findTasksByUserId() {
return taskService.findTasksBelongToUser(idProvider.getCurrentUserId());
}
Returned JSON:
[
{
id: 1,
version: 0,
name: "Task1",
description: "description1",
priority: 1,
finished: true,
category: {
id: 1,
version: 0,
name: "Uncategorized",
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
}
},
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
},
position: 0
},
{
id: 2,
version: 0,
name: "Task2",
description: "description2",
priority: 4,
finished: true,
category: {
id: 1,
version: 0,
name: "Uncategorized",
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
}
},
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
},
position: 1
}]
And i got a error like this:
Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0
I dont know what is wrong but maybe format of json is not correct, because it's start with the sign '['.
I am a beginner in React so please about some hint and help.
regards
json spring reactjs api
asked Nov 14 '18 at 18:18
AdrianAdrian
328
add a comment |
1
1
1
i have a problem with fetch data from api exposed by spring.
I want to fetch data by:
componentDidMount() {
this.setState({isLoading: true});
fetch('http://localhost:8080/api/tasks/')
.then(response => { return response.json() })
.then(results => this.setState({
tasks: results,
isLoading: false
}));
The spring api which return data:
@CrossOrigin(origins = "http://localhost:3000")
@GetMapping
public List<Task> findTasksByUserId() {
return taskService.findTasksBelongToUser(idProvider.getCurrentUserId());
}
Returned JSON:
[
{
id: 1,
version: 0,
name: "Task1",
description: "description1",
priority: 1,
finished: true,
category: {
id: 1,
version: 0,
name: "Uncategorized",
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
}
},
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
},
position: 0
},
{
id: 2,
version: 0,
name: "Task2",
description: "description2",
priority: 4,
finished: true,
category: {
id: 1,
version: 0,
name: "Uncategorized",
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
}
},
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
},
position: 1
}]
And i got a error like this:
Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0
I dont know what is wrong but maybe format of json is not correct, because it's start with the sign '['.
I am a beginner in React so please about some hint and help.
regards
json spring reactjs api
asked Nov 14 '18 at 18:18
AdrianAdrian
328
i have a problem with fetch data from api exposed by spring.
I want to fetch data by:
componentDidMount() {
this.setState({isLoading: true});
fetch('http://localhost:8080/api/tasks/')
.then(response => { return response.json() })
.then(results => this.setState({
tasks: results,
isLoading: false
}));
The spring api which return data:
@CrossOrigin(origins = "http://localhost:3000")
@GetMapping
public List<Task> findTasksByUserId() {
return taskService.findTasksBelongToUser(idProvider.getCurrentUserId());
}
Returned JSON:
[
{
id: 1,
version: 0,
name: "Task1",
description: "description1",
priority: 1,
finished: true,
category: {
id: 1,
version: 0,
name: "Uncategorized",
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
}
},
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
},
position: 0
},
{
id: 2,
version: 0,
name: "Task2",
description: "description2",
priority: 4,
finished: true,
category: {
id: 1,
version: 0,
name: "Uncategorized",
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
}
},
user: {
id: 1,
version: 0,
login: "admin",
email: "admin@todo.pl",
enabled: true
},
position: 1
}]
And i got a error like this:
Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0
I dont know what is wrong but maybe format of json is not correct, because it's start with the sign '['.
I am a beginner in React so please about some hint and help.
regards
json spring reactjs api
json spring reactjs api
asked Nov 14 '18 at 18:18
AdrianAdrian
328
asked Nov 14 '18 at 18:18
AdrianAdrian
328
asked Nov 14 '18 at 18:18
AdrianAdrian
328
asked Nov 14 '18 at 18:18
AdrianAdrian
328
asked Nov 14 '18 at 18:18
AdrianAdrian
328
328
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
1
fetch() returns a promise which gets resolved into an HTTP response of course, not the actual JSON. To extract the JSON body content from the response, we use the json() method.
Try adding two headers Content-Type and Accept to be equal to application/json.
fetch('http://localhost:8080/api/tasks/', {
headers : {
'Content-Type': 'application/json',
'Accept': 'application/json'
}
})
.then(response => { return response.json() })
.then(results => this.setState({
tasks: results,
isLoading: false
}));
answered Nov 14 '18 at 18:28
ShivamShivam
1,1121230
Ok, but now i have a problem with function map in this line {tasks.map(task => ( <li key={task.id}> {task.name} </li> ))}
– Adrian
Nov 14 '18 at 18:38
what problem? If thetasksis an arraymapshould work
– Shivam
Nov 14 '18 at 18:39
hmm that's weird because like i show above json is an array with objects
– Adrian
Nov 14 '18 at 18:40
If its array of objects then the function passed as argument to map will be executed for all objects in the array. Did you resolve your issue?
– Shivam
Nov 14 '18 at 18:43
No i am not yet, i dont't know why map doesnt fit
– Adrian
Nov 14 '18 at 18:46
|
show 7 more comments
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
fetch() returns a promise which gets resolved into an HTTP response of course, not the actual JSON. To extract the JSON body content from the response, we use the json() method.
Try adding two headers Content-Type and Accept to be equal to application/json.
fetch('http://localhost:8080/api/tasks/', {
headers : {
'Content-Type': 'application/json',
'Accept': 'application/json'
}
})
.then(response => { return response.json() })
.then(results => this.setState({
tasks: results,
isLoading: false
}));
answered Nov 14 '18 at 18:28
ShivamShivam
1,1121230
Ok, but now i have a problem with function map in this line {tasks.map(task => ( <li key={task.id}> {task.name} </li> ))}
– Adrian
Nov 14 '18 at 18:38
what problem? If thetasksis an arraymapshould work
– Shivam
Nov 14 '18 at 18:39
hmm that's weird because like i show above json is an array with objects
– Adrian
Nov 14 '18 at 18:40
If its array of objects then the function passed as argument to map will be executed for all objects in the array. Did you resolve your issue?
– Shivam
Nov 14 '18 at 18:43
No i am not yet, i dont't know why map doesnt fit
– Adrian
Nov 14 '18 at 18:46
|
show 7 more comments
1
fetch() returns a promise which gets resolved into an HTTP response of course, not the actual JSON. To extract the JSON body content from the response, we use the json() method.
Try adding two headers Content-Type and Accept to be equal to application/json.
fetch('http://localhost:8080/api/tasks/', {
headers : {
'Content-Type': 'application/json',
'Accept': 'application/json'
}
})
.then(response => { return response.json() })
.then(results => this.setState({
tasks: results,
isLoading: false
}));
answered Nov 14 '18 at 18:28
ShivamShivam
1,1121230
Ok, but now i have a problem with function map in this line {tasks.map(task => ( <li key={task.id}> {task.name} </li> ))}
– Adrian
Nov 14 '18 at 18:38
what problem? If thetasksis an arraymapshould work
– Shivam
Nov 14 '18 at 18:39
hmm that's weird because like i show above json is an array with objects
– Adrian
Nov 14 '18 at 18:40
If its array of objects then the function passed as argument to map will be executed for all objects in the array. Did you resolve your issue?
– Shivam
Nov 14 '18 at 18:43
No i am not yet, i dont't know why map doesnt fit
– Adrian
Nov 14 '18 at 18:46
|
show 7 more comments
1
1
1
fetch() returns a promise which gets resolved into an HTTP response of course, not the actual JSON. To extract the JSON body content from the response, we use the json() method.
Try adding two headers Content-Type and Accept to be equal to application/json.
fetch('http://localhost:8080/api/tasks/', {
headers : {
'Content-Type': 'application/json',
'Accept': 'application/json'
}
})
.then(response => { return response.json() })
.then(results => this.setState({
tasks: results,
isLoading: false
}));
answered Nov 14 '18 at 18:28
ShivamShivam
1,1121230
fetch() returns a promise which gets resolved into an HTTP response of course, not the actual JSON. To extract the JSON body content from the response, we use the json() method.
Try adding two headers Content-Type and Accept to be equal to application/json.
fetch('http://localhost:8080/api/tasks/', {
headers : {
'Content-Type': 'application/json',
'Accept': 'application/json'
}
})
.then(response => { return response.json() })
.then(results => this.setState({
tasks: results,
isLoading: false
}));
answered Nov 14 '18 at 18:28
ShivamShivam
1,1121230
edited Nov 15 '18 at 5:32
answered Nov 14 '18 at 18:28
ShivamShivam
1,1121230
answered Nov 14 '18 at 18:28
ShivamShivam
1,1121230
answered Nov 14 '18 at 18:28
ShivamShivam
1,1121230
1,1121230
Ok, but now i have a problem with function map in this line {tasks.map(task => ( <li key={task.id}> {task.name} </li> ))}
– Adrian
Nov 14 '18 at 18:38
what problem? If thetasksis an arraymapshould work
– Shivam
Nov 14 '18 at 18:39
hmm that's weird because like i show above json is an array with objects
– Adrian
Nov 14 '18 at 18:40
If its array of objects then the function passed as argument to map will be executed for all objects in the array. Did you resolve your issue?
– Shivam
Nov 14 '18 at 18:43
No i am not yet, i dont't know why map doesnt fit
– Adrian
Nov 14 '18 at 18:46
|
show 7 more comments
Ok, but now i have a problem with function map in this line {tasks.map(task => ( <li key={task.id}> {task.name} </li> ))}
– Adrian
Nov 14 '18 at 18:38
what problem? If thetasksis an arraymapshould work
– Shivam
Nov 14 '18 at 18:39
hmm that's weird because like i show above json is an array with objects
– Adrian
Nov 14 '18 at 18:40
If its array of objects then the function passed as argument to map will be executed for all objects in the array. Did you resolve your issue?
– Shivam
Nov 14 '18 at 18:43
No i am not yet, i dont't know why map doesnt fit
– Adrian
Nov 14 '18 at 18:46
Ok, but now i have a problem with function map in this line {tasks.map(task => ( <li key={task.id}> {task.name} </li> ))}
– Adrian
Nov 14 '18 at 18:38
Ok, but now i have a problem with function map in this line {tasks.map(task => ( <li key={task.id}> {task.name} </li> ))}
– Adrian
Nov 14 '18 at 18:38
what problem? If the
tasks is an array map should work– Shivam
Nov 14 '18 at 18:39
what problem? If the
tasks is an array map should work– Shivam
Nov 14 '18 at 18:39
hmm that's weird because like i show above json is an array with objects
– Adrian
Nov 14 '18 at 18:40
hmm that's weird because like i show above json is an array with objects
– Adrian
Nov 14 '18 at 18:40
If its array of objects then the function passed as argument to map will be executed for all objects in the array. Did you resolve your issue?
– Shivam
Nov 14 '18 at 18:43
If its array of objects then the function passed as argument to map will be executed for all objects in the array. Did you resolve your issue?
– Shivam
Nov 14 '18 at 18:43
No i am not yet, i dont't know why map doesnt fit
– Adrian
Nov 14 '18 at 18:46
No i am not yet, i dont't know why map doesnt fit
– Adrian
Nov 14 '18 at 18:46
|
show 7 more comments
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