Error: JSON array contains unterminated string literal

Question

Error: JSON array contains unterminated string literal

Hey there,

 var favorites = 'Array (


[0] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]
[1] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]
[2] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]

)
';

I've been encountering a syntax error - an unterminated string literal when I try to display the above content using console.log in JavaScript. I tried changing some characters and using regex patterns, but it seems like multi-line strings are causing an issue.

This dilemma began with an SQL query as seen below...

$favLinks = [];
$favQuery = "SELECT * FROM userfavorites WHERE users = '$username'";
$favResults = mysqli_query($conn, $favQuery);

while($row = mysqli_fetch_assoc($favResults)) {

array_push($favLinks, $row['fav_id']);

Then, I attempted this...

var favorites = <?php print_r ($favLinks); ?>

which resulted in the earlier mentioned problem.

If you have any suggestions on fixing this syntax error, I'd greatly appreciate it. Thanks!

javascript json

Answer 1

Answer №1

Since multiline strings are not permitted in JavaScript:

"A
 B"

This will result in a syntax error. You can either replace the newlines with \n or use template literals like so:

`A
 B`

In your code snippet:

var newfavz =` <?php print_r ($favurl); ?>`;

Even though you fixed the error, the string is still not usable and needs to be parsed. Consider using JSON or creating your own parser.

Answer 2

Since multiline strings are not permitted in JavaScript:

"A
 B"

This will result in a syntax error. You can either replace the newlines with \n or use template literals like so:

`A
 B`

In your code snippet:

var newfavz =` <?php print_r ($favurl); ?>`;

Even though you fixed the error, the string is still not usable and needs to be parsed. Consider using JSON or creating your own parser.

Answer 3

Answer №2

To create a multiline string in JavaScript, remember to add a backslash at the end of each line:

const newFavorites = 'Array (\
[0] => ["6","1","2","5","3","4"]\
[1] => ["6","1","2","5","3","4"]\
[2] => ["6","1","2","5","3","4"]\
)\
';

Answer 4

To create a multiline string in JavaScript, remember to add a backslash at the end of each line:

const newFavorites = 'Array (\
[0] => ["6","1","2","5","3","4"]\
[1] => ["6","1","2","5","3","4"]\
[2] => ["6","1","2","5","3","4"]\
)\
';

Answer 5

Answer №3

To achieve the desired output, there are multiple approaches you can take:

One way is to utilize ES6 template literals:

var newfavz = `Array (

[0] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]
[1] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]
[2] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]

)
`;

Another option would be to use a backslash for line breaks:

var newfavz = 'Array (\n\
\n\
[0] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n\
[1] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n\
[2] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n\
\n)\
';

You can also concatenate strings to achieve the desired format:

var newfavz = 'Array (\n' +
'\n' +
'[0] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n' +
'[1] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n' +
'[2] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n' +
'\n' +
')\n';

The symbol \n represents a newline character in this context.

Answer 6

To achieve the desired output, there are multiple approaches you can take:

One way is to utilize ES6 template literals:

var newfavz = `Array (

[0] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]
[1] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]
[2] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]

)
`;

Another option would be to use a backslash for line breaks:

var newfavz = 'Array (\n\
\n\
[0] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n\
[1] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n\
[2] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n\
\n)\
';

You can also concatenate strings to achieve the desired format:

var newfavz = 'Array (\n' +
'\n' +
'[0] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n' +
'[1] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n' +
'[2] => [" 6 "," 1 "," 2 "," 5 "," 3 "," 4 "]\n' +
'\n' +
')\n';

The symbol \n represents a newline character in this context.

Error: JSON array contains unterminated string literal

Answer №1

Answer №2

Answer №3

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