Introduction

The native function to switch from json is much too limited. It fails if the input text differs slightly from the strict JSON format and the error message is not at all explicit.

JSONEx attempts to remedy this situation by correcting the input text.

JSONEx

add quotation marks around the keys if they do not have one.
replace single quotes around keys or values with quotation marks
remove the commas at the end of the list of properties
Adds the missing right quotation mark to keys that have a left quotation mark

Error handling is improved. Instead of indicating a character position in the input string more or less at the parser's misunderstanding, JSONEx indicates the type of expected word, an extract from the input string where it is located. error.

How it works

At first, JSONEx uses the native function of the JSON API. If it fails, the input string is corrected and JSONEx retries the call to the native function a second time. If the parsing fails you get the improved message from the first parsing attempt and the improved message from the 2nd attempt.

Compare

Input	JSON Native		JSONEx
	status	message	status	message	undestand
{a:1}	error	Unexpected token a in JSON at position 1	ok		{"a":1}
{"a":1,}	error	Unexpected token } in JSON at position 7	ok		{"a":1}
{'a':1}	error	Unexpected token ' in JSON at position 1	ok		{"a":1}
{"a":[1,2,3,]}	error	Unexpected token ] in JSON at position 12	ok		{"a":[1,2,3]}
{"a":[1,2,3,'r']}	error	Unexpected token ] in JSON at position 12	ok		{"a":[1,2,3,"r"]}
{"a:1}	error	Unexpected end of JSON input	error	Unexpected end of JSON input while parsing near {"a:1} -----^ Error: Second chance: parse error at position 6 with state obj_key_str after {"a:1} --------------------^
[ {"a":1},{"b":2,"bb:3}]	error	Unexpected end of JSON input	error	Unexpected end of JSON input while parsing near "a":1},{"b":2,"bb:3}] -----------------------^ Error: Second chance: parse error at position 24 with state obj_key_str after [ {"a":1},{"b":2,"bb:3}] --------------------^

API

JSONEx.parse

JSONEx.parse(text)

textstring to parse

Parse a string as JSON and return the value.

JSONEx.stringify

JSONEx.stringify(obj)

obja object

string

Return a JSON string corresponding to the specified value.

JSONEx.correct

JSONEx.correct(text);

texta json string or similar

try to transform the text to be compatible JSON

JSONEx.replaceNativeJson

JSONEx.replaceNativeJson();

Replace JSON native parser with JSONEx

JSONEx.revertToNativeJson

JSONEx.revertToNativeJson();

Restore JSON native parser

API for json-better-parser