json-half-parse

npm install --save json-half-parse

Parses JSON, returning a partially parsed result if there are errors:

JSON.parse('[1, 2, ueauu]'); // Error
json.parse('[1, 2, ueauu]'); // [1, 2]
 
JSON.parse('{ "a": 1, "b":'); // Error
json.parse('{ "a": 1, "b":'); // { a: 1 }

Still respects JSON syntax: no trailling commas, double quoted strings only etc.

API

const { error, value } = json.parse(string);

value is an object like that returned JSON.parse. error is an object represented as { message, remainingText, location }

• location is represented as { line, column, offset }, where offset is character index

const { error, value } = json.parseWithAst(string);

value is an abstract syntax tree (ast) with each node being represented as { type, value, ?match, ?isComplete }.

• type is either null, string, boolean, number, array, or object
• For all primitive, value is the JSON value
• For an array, value is an array of values represented in the ast form
• For an object, value is a entry of [key, v], where key is a string, and v is an ast value
• match is available for primitives, and gives the string that was matched
• isComplete is available for objects and arrays, and indicates whether they were completely parsed

Not built around efficiency: don't use it in performance sensitive scenarios.