What are good practice to handle undefined ,null and empty errors while doing gliderecord

[Rajyalakshmi]

What are good practice to handle undefined ,null and empty errors while doing gliderecord in servicenow

[Nilesh Pol · Accepted solution]

@Rajyalakshmi here is some of examples to handle undefined ,null and empty errors while doing gliderecord

1.  Before using a GlideRecord, ensure it actually found something, Always wrap logic inside if (gr.next()) or while (gr.next()).

2. Sometimes a record exists, but a specific field may be null, undefined, or empty, then  gs.nil(value) safely checks if a variable is null, undefined, or an empty string ("").

3. When dealing with dynamic tables or uncertain fields use GlideRecord.IsValidRecord() or IsValidField() that will Prevents “invalid field name” or “undefined” errors at runtime.

4. Add clear logs for missing/empty data during development.

Summery:

Case	Recommended Practice
Check record existence	if (gr.next()) or if (gr.get(sys_id))
Check null/empty	if (!gs.nil(value))
Default value	`var val = gr.field
Validate record	gr.isValidRecord()
Validate field	gr.isValidField('field_name')
Handle JSON safely	try { JSON.parse() } catch(e)
Avoid direct field access	Always confirm existence first

[Ankur Bawiskar · Accepted solution]

@Rajyalakshmi 

what's your actual context or business requirement?

If my response helped please mark it correct and close the thread so that it benefits future readers.

[Nawal Singh · Accepted solution]

Hi @Rajyalakshmi ,

Please review the below link that will definitely answer your query-

https://www.servicenow.com/community/developer-articles/performance-best-practices-for-server-side-c...

If you found my response helpful, please mark it as helpful and accept it as the solution.

Thank you
Nawal Singh

[Nilesh Pol · Accepted solution]

@Rajyalakshmi here is some of examples to handle undefined ,null and empty errors while doing gliderecord

1.  Before using a GlideRecord, ensure it actually found something, Always wrap logic inside if (gr.next()) or while (gr.next()).

2. Sometimes a record exists, but a specific field may be null, undefined, or empty, then  gs.nil(value) safely checks if a variable is null, undefined, or an empty string ("").

3. When dealing with dynamic tables or uncertain fields use GlideRecord.IsValidRecord() or IsValidField() that will Prevents “invalid field name” or “undefined” errors at runtime.

4. Add clear logs for missing/empty data during development.

Summery:

Case	Recommended Practice
Check record existence	if (gr.next()) or if (gr.get(sys_id))
Check null/empty	if (!gs.nil(value))
Default value	`var val = gr.field
Validate record	gr.isValidRecord()
Validate field	gr.isValidField('field_name')
Handle JSON safely	try { JSON.parse() } catch(e)
Avoid direct field access	Always confirm existence first

[Ankur Bawiskar · Accepted solution]

@Rajyalakshmi 

what's your actual context or business requirement?

If my response helped please mark it correct and close the thread so that it benefits future readers.

[Rajyalakshmi · Accepted solution]

Hi @Ankur Bawiskar ,

Thank you for update. Just for understanding and to get good practice while development.

Regards,

Rajyalakshmi

[Nawal Singh · Accepted solution]

Hi @Rajyalakshmi ,

Please review the below link that will definitely answer your query-

https://www.servicenow.com/community/developer-articles/performance-best-practices-for-server-side-c...

If you found my response helpful, please mark it as helpful and accept it as the solution.

Thank you
Nawal Singh