Using python ijson to read a large json file with multiple json objects

Question

I'm trying to parse a large (~100MB) json file using ijson package which allows me to interact with the file in an efficient way. However, after writing some code like this,

with open(filename, 'r') as f:
    parser = ijson.parse(f)
    for prefix, event, value in parser:
        if prefix == "name":
            print(value)

I found that the code parses only the first line and not the rest of the lines from the file!!

Here is how a portion of my json file looks like:

{"name":"accelerator_pedal_position","value":0,"timestamp":1364323939.012000}
{"name":"engine_speed","value":772,"timestamp":1364323939.027000}
{"name":"vehicle_speed","value":0,"timestamp":1364323939.029000}
{"name":"accelerator_pedal_position","value":0,"timestamp":1364323939.035000}

In my opinion, I think ijson parses only one json object.

Can someone please suggest how to work around this?

Answer 1

Since the provided chunk looks more like a set of lines each composing an independent JSON, it should be parsed accordingly:

# each JSON is small, there's no need in iterative processing
import json 
with open(filename, 'r') as f:
    for line in f:
        data = json.loads(line)
        # data[u'name'], data[u'engine_speed'], data[u'timestamp'] now
        # contain correspoding values