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I'd like to read JSON-encoded data into C structs. The structure of the json data is known in advance, relatively flat and mimicked by some C struct typedefs. An array at the third level or so contains an extremely lengthy list of JSON objects which have to be processed one at a time.
The code is intended to run on a very constrained system so the library should not dynamically allocate memory.
I know there is Crockford's List of JSON libraries, but I'm not quite sure which one is the best fit for the stated problem.
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A function that does not accept a callback or return a promise blocks until it returns a value. So yes it JSON. parse blocks. Parsing JSON is a CPU intensive task, and JS is single threaded.
The JSON.parse() method parses a JSON string, constructing the JavaScript value or object described by the string. An optional reviver function can be provided to perform a transformation on the resulting object before it is returned.
JSON alone is not much of a threat. After all, it's only a data-interchange format. The real security concerns with JSON arise in the way that it is used. If misused, JSON-based applications can become vulnerable to attacks such as JSON hijacking and JSON injection.
JSON strings do not allow real newlines in its data; it can only have escaped newlines. Snowflake allows escaping the newline character by the use of an additional backslash character.
Try jsmn lib, I love that it can parse any json file with only two malloc's.
jsmn is a minimalistic library for parsing JSON data format. It can be easily used in small projects or can be integrated into embedded systems.
jsmn is a good choice, because:
- it is compatible with C89 compiler version
- it uses no dynamic memory allocation
- it has the smallest possible overhead
- it needs only one pass to parse JSON data
- it has no dependencies, even libc
- it is distributed under MIT license, so you can use it in your proprietary projects
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Try with json-c is one of the most common and it is open source and work also on Windows (Win32).
JSON-C implements a reference counting object model that allows you to easily construct JSON objects in C, output them as JSON formatted strings and parse JSON formatted strings back into the C representation of JSON objects.
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