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| Line 4: | Line 4: | ||
* the input is empty entirely or multiple white spaces | * the input is empty entirely or multiple white spaces | ||
* the input contains [[Byte order mark]] (BOM)<ref>[https://blog.longwin.com.tw/2013/11/php-json_decode-null-fix-2013/ PHP json_decode() 傳回 NULL 的解法 | Tsung's Blog]</ref> | * the input contains [[Byte order mark]] (BOM)<ref>[https://blog.longwin.com.tw/2013/11/php-json_decode-null-fix-2013/ PHP json_decode() 傳回 NULL 的解法 | Tsung's Blog]</ref> | ||
* Use {{kbd | key=<nowiki>'</nowiki>}} instead of {{kbd | key=<nowiki>"</nowiki>}} for quotation | |||
Solution: | Solution: | ||
* Not allowed empty input | * Not allowed empty input | ||
* Remove [[Byte order mark]] (BOM) | * Remove [[Byte order mark]] (BOM) | ||
* Use {{kbd | key=<nowiki>"</nowiki>}} for quotation | |||
* Use [https://jsonlint.com/ JSONLint - The JSON Validator] to validate the JSON format | * Use [https://jsonlint.com/ JSONLint - The JSON Validator] to validate the JSON format | ||