Api development

[lgtm-com[bot]]

This pull request introduces 31 alerts and fixes 4 when merging 211a8a1ea6f585ae55de90d67b83ad3aabe11c00 into 434669058b54a19b9eed1cc32b12a5834cca1de8 - view on LGTM.com

new alerts:

• 21 for Missing variable declaration
• 3 for Unused import
• 2 for Identical operands
• 2 for Useless conditional
• 1 for Unused local variable
• 1 for Potentially unsafe external link
• 1 for Incomplete URL substring sanitization

fixed alerts:

• 3 for Unused import
• 1 for Unused local variable