everfern-ai/everfern/json

Claude Code and agent skill by everfern-ai/everfern

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Use this skill any time a JSON (JavaScript Object Notation) file is the primary input or output. This includes tasks to: read, parse, validate, analyze, or modify JSON files; create new JSON files; merge or transform JSON structures; extract data from JSON; convert data to JSON format. If the user mentions a JSON file by name, extension, or path (.json), use this skill.

Install

npx vskill@latest install everfern-ai/everfern/json

SKILL.md

JSON File Handling in EverFern

Overview

Users may ask you to read, analyze, create, or modify JSON files. Use Python with built-in json module or pandas for structured data. Use absolute Windows paths (e.g., C:\Users\Username\Downloads\data.json).

Reading JSON Files

Read and Parse JSON
python
import json
# Read JSON file
with open(r'C:\path\to\file.json', 'r') as f:
data = json.load(f)
# Print formatted JSON
print(json.dumps(data, indent=2))
# Get specific values
value = data['key']
nested_value = data['parent']['child']
Read with pandas (for tabular JSON)
python
import pandas as pd
# Read JSON file as DataFrame
df = pd.read_json(r'C:\path\to\file.json')
# Preview data
print(df.head())
print(df.info())

Writing JSON Files

Write Python Objects as JSON
python
import json
data = {
'name': 'John',
'age': 30,
'email': 'john@example.com',
'hobbies': ['reading', 'coding', 'gaming']
}
# Write to file (formatted)
with open(r'C:\path\to\output.json', 'w') as f:
json.dump(data, f, indent=2)
# Write minified (compact)
with open(r'C:\path\to\output_minified.json', 'w') as f:
json.dump(data, f)

Parsing and Transforming JSON

Parse JSON String
python
import json
json_string = '{"name": "Alice", "age": 25}'
data = json.loads(json_string) # Parse string
print(data['name'])
Convert JSON to String
python
json_string = json.dumps(data, indent=2)
print(json_string)
Validate JSON
python
import json
def validate_json(json_file):
try:
with open(json_file, 'r') as f:
json.load(f)
print("✓ Valid JSON")
return True
except json.JSONDecodeError as e:
print(f"✗ Invalid JSON: {e}")
return False
validate_json(r'C:\path\to\file.json')

Data Transformation

Extract and Transform Data
python
import json
# Read JSON
with open(r'C:\path\to\input.json', 'r') as f:
data = json.load(f)
# Transform (example: extract specific fields)
transformed = [
{'id': item['id'], 'name': item['name']}
for item in data
]
# Write transformed data
with open(r'C:\path\to\output.json', 'w') as f:
json.dump(transformed, f, indent=2)
Flatten Nested JSON
python
import json
import pandas as pd
with open(r'C:\path\to\nested.json', 'r') as f:
data = json.load(f)
# Flatten to DataFrame then back to JSON
df = pd.json_normalize(data)
flattened = json.loads(df.to_json(orient='records'))
with open(r'C:\path\to\flattened.json', 'w') as f:
json.dump(flattened, f, indent=2)
Merge Multiple JSON Files
python
import json
files = [
r'C:\path\to\file1.json',
r'C:\path\to\file2.json',
r'C:\path\to\file3.json'
]
merged = []
for file in files:
with open(file, 'r') as f:
merged.extend(json.load(f))
with open(r'C:\path\to\merged.json', 'w') as f:
json.dump(merged, f, indent=2)

Query and Filter JSON

Filter Arrays in JSON
python
import json
with open(r'C:\path\to\file.json', 'r') as f:
data = json.load(f)
# Filter: get items where age > 25
filtered = [item for item in data if item['age'] > 25]
with open(r'C:\path\to\filtered.json', 'w') as f:
json.dump(filtered, f, indent=2)
Group JSON Data
python
import json
from itertools import groupby
with open(r'C:\path\to\file.json', 'r') as f:
data = json.load(f)
# Group by category
grouped = {}
for item in data:
category = item['category']
if category not in grouped:
grouped[category] = []
grouped[category].append(item)
with open(r'C:\path\to\grouped.json', 'w') as f:
json.dump(grouped, f, indent=2)

Special Cases

Handle Large JSON Files
python
import json
# Process in chunks
def process_large_json(file_path, chunk_size=1000):
with open(file_path, 'r') as f:
data = json.load(f)
for i in range(0, len(data), chunk_size):
chunk = data[i:i + chunk_size]
# Process chunk
print(f"Processing {len(chunk)} items...")
# Save chunk results
with open(f'output_{i}.json', 'w') as out:
json.dump(chunk, out)
process_large_json(r'C:\path\to\large_file.json')
Add UTF-8 BOM (for Excel compatibility)
python
import json
with open(r'C:\path\to\file.json', 'w', encoding='utf-8-sig') as f:
json.dump(data, f, indent=2, ensure_ascii=False)

Tips and Best Practices

  • Always validate: Use try/except with json.JSONDecodeError when reading untrusted JSON
  • Pretty print: Use indent=2 or indent=4 for human-readable output
  • Encoding: Always specify encoding='utf-8' for Windows compatibility
  • Escape characters: Use ensure_ascii=False to preserve non-ASCII characters
  • Large files: For very large JSON, consider streaming or chunking
  • Comments: JSON doesn't support comments; use separate .jsonc files if comments are needed

Security

  • Security scanPassed, 93 of 100Pattern checks on the skill's files.
  • Model reviewNot runA model review is scheduled for the next rescan.

Quality evaluation

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Source

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