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You can encounter the “JSONDecodeError: Expecting value line 1 column 1 (char 0)” in Python. This guide will navigate through this error and how to fix it effectively.
When does “Jsondecodeerror: Expecting Value: Line 1 Column 1 (Char 0)” happen?
The “Jsondecodeerror: Expecting Value: Line 1 Column 1 (Char 0)” will happen when users decode the empty string as JSON or attempt to parse incorrect JSON.
This is an illustrated example of when this error happens:
import json
# json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
result = json.loads('')
Here are the main causes of this error:
1. Attempting to read a JSON file wrongly.
2. Empty JSON file.
3. Attempting to parse a response with different content-type.
How to solve this error?
Approach 1: Use JSON. load() to read a file correctly
First, you need to read the example in which you have a file with the main contents below.
[
{"margherita":7.99},
{"pepperoni":9.99},
{"four cheeses":10.99}
]
Next, use the JSON library.
import json
json_path = 'pizza.json'
data = json.loads(json_path)
Run the code and the “JSONDecodeError: Expecting value line 1 column 1 (char 0)” appear.
JSONDecodeError: Expecting value: line 1 column 1 (char 0)Json.loads() is replaced by json.load() in this case.
import json
json_path = 'pizza.json'
with open(json_path, 'r') as f:
data = json.load(f.read())
print(data)
Finally, you run the code and check the outcome below.
[{'margherita': 7.99}, {'pepperoni': 9.99}, {'four cheeses': 10.99}]Cool! This error is solved completely.
Approach 2: Add a try/except statement
Take a look at the example in which you get the empty file that is read by using “JSON.loads().” At this moment, the file is named ‘particles.json.’
import json
filename = 'particles.json'
with open(filename, 'r') as f:
contents = json.loads(f.read())
print(contents)
As the JSON file is empty, this error will occur during its attempts to read the contents.
JSONDecodeError Traceback (most recent call last)
Input In [1], in <cell line: 5>()
3 filename = 'particles.json'
5 with open(filename, 'r') as f:
----> 6 contents = json.loads(f.read())
7 print(contents)
File ~/opt/anaconda3/lib/python3.8/json/__init__.py:357, in loads(s, cls, object_hook, parse_float, parse_int, parse_constant, object_pairs_hook, **kw)
352 del kw['encoding']
354 if (cls is None and object_hook is None and
355 parse_int is None and parse_float is None and
356 parse_constant is None and object_pairs_hook is None and not kw):
--> 357 return _default_decoder.decode(s)
358 if cls is None:
359 cls = JSONDecoder
File ~/opt/anaconda3/lib/python3.8/json/decoder.py:337, in JSONDecoder.decode(self, s, _w)
332 def decode(self, s, _w=WHITESPACE.match):
333 """Return the Python representation of ``s`` (a ``str`` instance
334 containing a JSON document).
335
336 """
--> 337 obj, end = self.raw_decode(s, idx=_w(s, 0).end())
338 end = _w(s, end).end()
339 if end != len(s):
File ~/opt/anaconda3/lib/python3.8/json/decoder.py:355, in JSONDecoder.raw_decode(self, s, idx)
353 obj, end = self.scan_once(s, idx)
354 except StopIteration as err:
--> 355 raise JSONDecodeError("Expecting value", s, err.value) from None
356 return obj, end
JSONDecodeError: Expecting value: line 1 column 1 (char 0)The best way to deal with this empty file is by adding a statement to discover the error.
import json
filename = 'particles.json'
with open(filename, 'r') as f:
try:
contents = json.loads(f.read())
print(contents)
except json.decoder.JSONDecodeError:
print('File is empty')
Next, you add the content to this file.
[
{"proton":938.3},
{"neutron":939.6},
{"electron":0.51}
]
Then, read the file into the program.
import json
filename = 'particles.json'
with open(filename, 'r') as f:
try:
contents = json.loads(f.read())
print(contents)
except json.decoder.JSONDecodeError:
print('File is empty')
Lastly, print the result.
[{'proton': 938.3}, {'neutron': 939.6}, {'electron': 0.51}]Based on the result above, this error is tackled completely.
Approach 3: Check the response status code carefully before doing the JSON parse
Look at the example in which you need to parse the JSON response by implementing the request library. First of all, you send a GET call and take a response. However, you face the response which brings the error.
To solve this problem, let’s check the code is OK before doing the Json parse. You have to browse around the code to check the response brings the 200 status code and that the content type is valid.
import requests
from requests.exceptions import HTTPError
url = 'https://httpbin.org/get'
try:
response = requests.get(url)
status = response.status_code
if (status != 204 and response.headers["content-type"].strip().startswith("application/json")):
try:
json_response = response.json()
print(json_response)
except ValueError:
print('Bad Data from Server. Response content is not valid JSON')
elif (status != 204):
try:
print(response.text)
except ValueError:
print('Bad Data From Server. Reponse content is not valid text')
except HTTPError as http_err:
print(f'HTTP error occurred: {http_err}')
except Exception as err:
print(f'Other error occurred: {err}')
Next, run the code to obtain the outcome.
{'args': {}, 'headers': {'Accept': '*/*', 'Accept-Encoding': 'gzip, deflate, br', 'Host': 'httpbin.org', 'User-Agent': 'python-requests/2.27.1', 'X-Amzn-Trace-Id': 'Root=1-6265a5c1-3b57327c02057a3a39ffe86d'}, 'origin': '90.206.95.191', 'url': 'https://httpbin.org/get'}The error is eliminated in this case.
Conclusion
That’s all about the “JSONDecodeError: Expecting value line 1 column 1 (char 0)”. If you have some questions related to it, please contact us soon.
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