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JSON-parse-Error.html - JSON.parse() Errors
How to catch errors when calling the JSON.parse() function in JavaScript?
✍: FYIcenter.com
If you want to catch errors when calling the JSON.parse() function in JavaScript,
you can follow this tutorial:
1. Use the "try {...} catch {...}" block to catch the error object throw from the JSON.parse() function, as shown below:
try { var val = JSON.parse(...); ... } catch (err) { ... }
2. Print out the "message" string from the error object back to the user or the log file. The message string gives more details about the error, as shown below:
try { ... } catch (err) { document.write(" err.message = "+err.message+"\n"); ... }
3. Enter the following example JavaScript code in a file, JSON-parse-Error.html:
<!-- JSON-parse-Error.html Copyright (c) FYIcenter.com --> <html> <body> <script type="text/javascript"> try { var val1 = JSON.parse('2020'); // Valid var val2 = JSON.parse('"foo"'); // Valid var val3 = JSON.parse('[1, 5, "false",]'); // Invalid document.write("<p>Value from JSON.parse():</p>"); document.write("<pre>"); document.write(" val1.toString() = "+val1.toString()+"\n"); document.write(" val2.toString() = "+val2.toString()+"\n"); document.write(" val3.toString() = "+val3.toString()+"\n"); document.write("</pre>"); } catch (err) { document.write("<p>Error from JSON.parse():</p>"); document.write("<pre>"); document.write(" err.message = "+err.message+"\n"); document.write("</pre>"); } </script> </body> </html>
4. Save the above code in a file and open it in a Web browser. You see the following output:
Error from JSON.parse(): err.message = Unexpected token ] in JSON at position 15
2017-08-16, 631👍, 0💬
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