JavaScript SyntaxError – JSON.parse: bad parsing

This JavaScript exception thrown by JSON.parse() occurs if string passed as a parameter to the method is invalid.

Message:

SyntaxError: JSON.parse: unterminated string literal
SyntaxError: JSON.parse: bad control character in string literal
SyntaxError: JSON.parse: bad character in string literal
SyntaxError: JSON.parse: bad Unicode escape
SyntaxError: JSON.parse: bad escape character
SyntaxError: JSON.parse: unterminated string
SyntaxError: JSON.parse: no number after minus sign
SyntaxError: JSON.parse: unexpected non-digit
SyntaxError: JSON.parse: missing digits after decimal point
SyntaxError: JSON.parse: unterminated fractional number
SyntaxError: JSON.parse: missing digits after exponent indicator
SyntaxError: JSON.parse: missing digits after exponent sign
SyntaxError: JSON.parse: exponent part is missing a number
SyntaxError: JSON.parse: unexpected end of data
SyntaxError: JSON.parse: unexpected keyword
SyntaxError: JSON.parse: unexpected character
SyntaxError: JSON.parse: end of data while reading object contents
SyntaxError: JSON.parse: expected property name or '}'
SyntaxError: JSON.parse: end of data when ',' or ']' was expected
SyntaxError: JSON.parse: expected ',' or ']' after array element
SyntaxError: JSON.parse: end of data when property name was expected
SyntaxError: JSON.parse: expected double-quoted property name
SyntaxError: JSON.parse: end of data after property name when ':' 
             was expected
SyntaxError: JSON.parse: expected ':' after property name in object
SyntaxError: JSON.parse: end of data after property value in object
SyntaxError: JSON.parse: expected ',' or '}' after property value in 
             object
SyntaxError: JSON.parse: expected ',' or '}' after property-value 
             pair in object literal
SyntaxError: JSON.parse: property names must be double-quoted strings
SyntaxError: JSON.parse: expected property name or '}'
SyntaxError: JSON.parse: unexpected character
SyntaxError: JSON.parse: unexpected non-whitespace character after 
             JSON data
SyntaxError: JSON.parse Error: Invalid character at position {0} 
             (Edge)

Error Type:

SyntaxError

Cause of Error: This string passed to JSON.parse() method is invalid and will throw this error.

Example 1:



HTML

filter_none

edit
close

play_arrow

link
brightness_4
code

<script>
    var str = '{"Prop_1" : "Val_1"}';
    JSON.parse(str);
    document.write(str);
</script>

chevron_right


Output:

{"Prop_1" : "Val_1"}

Example 2:

HTML

filter_none

edit
close

play_arrow

link
brightness_4
code

<script>
    var str = '{"Prop_1" : "Val_1"}}';
    JSON.parse(str);
    document.write(str);
</script>

chevron_right


Output(in console):

Unexpected token } in JSON at position 2

full-stack-img

My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.


Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.