A Python parser for ISO 15022 messages used for messaging in securities trading by the SWIFT network. This parser is designed to handle the standard format of SWIFT financial messages.
$ pip install swift-parser-py
$ git clone https://github.com/solchos/swift-parser.git
$ cd swift-parser
$ pip install -e .
from swift_parser_py.swift_parser import SwiftParser
# Initialize the parser
parser = SwiftParser()
# Parse a SWIFT message
with open('message.txt', 'r') as file:
swift_message = file.read()
# Method 1: Using process() for direct result
result = parser.process(swift_message)
print(result)
# Method 2: Using parse() with a callback
def callback(err, result):
if err:
print(f"Error: {err}")
else:
print(result)
parser.parse(swift_message, callback)
It is also possible to run the parser from the command line:
$ python -m swift_parser_py.swift_parser path/to/message.txt
The parser is composed of several specialized components:
block1_parser.py: Parses Block 1 (Basic Header)block2_parser.py: Parses Block 2 (Application Header)block3_parser.py: Parses Block 3 (User Header, optional)block5_parser.py: Parses Block 5 (Trailer, optional)metadata/patterns.jsonThe parser fully supports Block 5 (Trailer) with the following features:
CHK: Checksum (mandatory)TNG: Test & Training Message (optional)PDE: Possible Duplicate Emission (optional)DLM: Delayed Message (optional)MRF: Message Reference (optional)PDM: Possible Duplicate Message (optional)SYS: System Originated Message (optional)FinParserMtParserThe parser supports an extensive set of field patterns as defined in the ISO 15022 standard:
For more details about field patterns, see FIELD_PATTERNS.md
The parser supports all standard SWIFT MT message types, including but not limited to:
Parsing this SWIFT message:
{1:F01EXAMPLEBANK0001000001}{2:I103RECEIVERBANK0000N}{3:{108:MSGREF2023}{121:REF-XYZ-789}}{4:
:20:CUSTREF2023-001
:23B:CRED
:32A:230803USD5000,00
:33B:USD5000,00
:50K:/87654321
SENDER COMPANY LTD
123 SENDER STREET, CITY
:52A:ORDERBANK
:53A:SENDERBANK
:57A:RECEIVERBANK
:59:/12345678
BENEFICIARY NAME
15 BENEFICIARY ROAD
:70:PAYMENT FOR SERVICES
INVOICE 2023-001
:71A:SHA
:72:/ACC/INTERNAL TRANSFER
-}{5:{CHK:123456789ABC}{PDE:1348120811BANKFRPPAXXX2222123456}}
Results in a structured dictionary with blocks and parsed fields:
{
"block1": {
"block_id": 1,
"content": "F01EXAMPLEBANK0001000001",
"application_id": "F",
"service_id": "01",
"receiving_lt_id": "EXAMPLEBANK0",
"session_number": "0010",
"sequence_number": "00001"
},
"block2": {
"content": "I103RECEIVERBANK0000N",
"block_id": 2,
"direction": "I",
"msg_type": "103",
"bic": "RECEIVERBA",
"prio": "N"
},
"block3": {
"block_id": 3,
"tags": {
"108": "MSGREF2023",
"121": "REF-XYZ-789"
},
"content": [
{
"name": "108",
"content": [
"MSGREF2023"
]
},
{
"name": "121",
"content": [
"REF-XYZ-789"
]
}
]
},
"block4": {
"fields": [
{
"type": "20",
"option": "",
"fieldValue": "CUSTREF2023-001",
"content": ":20:CUSTREF2023-001",
"ast": {
"Reference Number": "CUSTREF2023-001"
}
},
{
"type": "23",
"option": "B",
"fieldValue": "CRED",
"content": ":23B:CRED",
"ast": {
"Bank Operation Code": "CRED"
}
},
{
"type": "32",
"option": "A",
"fieldValue": "230803USD5000,00",
"content": ":32A:230803USD5000,00",
"ast": {
"Date": "230803",
"Currency": "USD",
"Amount": "5000,00"
}
},
{
"type": "33",
"option": "B",
"fieldValue": "USD5000,00",
"content": ":33B:USD5000,00",
"ast": {
"Currency": "USD",
"Instructed Amount": "5000,00"
}
},
{
"type": "50",
"option": "K",
"fieldValue": "/87654321\nSENDER COMPANY LTD\n123 SENDER STREET, CITY",
"content": ":50K:/87654321\nSENDER COMPANY LTD\n123 SENDER STREET, CITY",
"ast": {
"Account": "/87654321",
"Name": "SENDER COMPANY LTD",
"Address": ["123 SENDER STREET, CITY"],
"Name and Address": ["SENDER COMPANY LTD", "123 SENDER STREET, CITY"]
}
},
{
"type": "52",
"option": "A",
"fieldValue": "ORDERBANK",
"content": ":52A:ORDERBANK",
"ast": {
"BIC": "ORDERBANK"
}
},
{
"type": "53",
"option": "A",
"fieldValue": "SENDERBANK",
"content": ":53A:SENDERBANK",
"ast": {
"BIC": "SENDERBANK"
}
},
{
"type": "57",
"option": "A",
"fieldValue": "RECEIVERBANK",
"content": ":57A:RECEIVERBANK",
"ast": {
"BIC": "RECEIVERBANK"
}
}
// Additional fields omitted for brevity
]
},
"block5": {
"block_id": 5,
"tags": {
"CHK": "123456789ABC",
"PDE": "1348120811BANKFRPPAXXX2222123456"
},
"content": [
{
"name": "CHK",
"content": [
"123456789ABC"
]
},
{
"name": "PDE",
"content": [
"1348120811BANKFRPPAXXX2222123456"
]
}
],
"pde_details": {
"time": "1348",
"date": "120811",
"bic": "BANKFRPPAXXX",
"session_number": "2222",
"sequence_number": "123456"
}
}
}
## Usage Examples
### 1. Basic Parsing
```python
from swift_parser_py.swift_parser import SwiftParser
# Initialize the parser
parser = SwiftParser()
# Parse a SWIFT message
swift_message = "{1:F01EXAMPLEBANK0001000001}{2:I103RECEIVERBANK0000N}..."
result = parser.process(swift_message)
# Access basic message information
msg_type = result['block2']['msg_type'] # "103"
sender_bic = result['block2']['bic'] # "RECEIVERBA"
# Access specific fields
reference = result['block4']['fields'][0]['fieldValue'] # "CUSTREF2023-001"
amount = result['block4']['fields'][2]['ast']['Amount'] # "5000,00"
currency = result['block4']['fields'][2]['ast']['Currency'] # "USD"
sender_name = result['block4']['fields'][4]['ast']['Name'] # "SENDER COMPANY LTD"
beneficiary_account = result['block4']['fields'][8]['ast']['Account'] # "/12345678"
from swift_parser_py.swift_parser import SwiftParser
def message_callback(err, result):
if err:
print(f"Error parsing message: {err}")
else:
# Process the result
print(f"Message type: MT{result['block2']['msg_type']}")
print(f"Reference: {result['block4']['fields'][0]['fieldValue']}")
print(f"Amount: {result['block4']['fields'][2]['ast']['Amount']} {result['block4']['fields'][2]['ast']['Currency']}")
# Initialize the parser
parser = SwiftParser()
# Parse with callback
parser.parse(swift_message, message_callback)
You can run the parser directly from the command line:
# Using the module
python -m swift_parser_py.swift_parser path/to/message.txt
# Output will be printed to the console in JSON format
import os
from swift_parser_py.swift_parser import SwiftParser
def process_directory(directory_path):
parser = SwiftParser()
results = []
for filename in os.listdir(directory_path):
if filename.endswith('.txt'):
file_path = os.path.join(directory_path, filename)
with open(file_path, 'r') as file:
swift_message = file.read()
try:
result = parser.process(swift_message)
results.append({
'filename': filename,
'parsed': result,
'status': 'success'
})
except Exception as e:
results.append({
'filename': filename,
'error': str(e),
'status': 'error'
})
return results
# Process all messages in a directory
results = process_directory('path/to/messages')
from swift_parser_py.swift_parser import SwiftParser
parser = SwiftParser()
# Method 1: Using try/except
try:
result = parser.process(swift_message)
# Check for field parsing errors
for field in result['block4']['fields']:
if 'ast' in field and 'error' in field['ast']:
print(f"Warning: Field {field['type']}{field.get('option', '')} parsing error: {field['ast']['error']}")
except Exception as e:
print(f"Error parsing message: {e}")
# Method 2: Using callback
def callback(err, result):
if err:
print(f"Error: {err}")
else:
# Process the result
print(f"Message type: MT{result['block2']['msg_type']}")
print(f"Reference: {result['block4']['fields'][0]['fieldValue']}")
# Parse with callback
parser.parse(swift_message, callback)
import sqlite3
from swift_parser_py.swift_parser import SwiftParser
def store_messages_in_db(messages_directory, db_path):
# Initialize parser and database
parser = SwiftParser()
conn = sqlite3.connect(db_path)
cursor = conn.cursor()
# Create table if it doesn't exist
cursor.execute('''
CREATE TABLE IF NOT EXISTS swift_messages (
id INTEGER PRIMARY KEY AUTOINCREMENT,
msg_type TEXT,
reference TEXT,
amount TEXT,
currency TEXT,
sender TEXT,
receiver TEXT,
raw_message TEXT,
parsed_data TEXT,
created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
)
''')
# Process messages and store in database
for filename in os.listdir(messages_directory):
if filename.endswith('.txt'):
with open(os.path.join(messages_directory, filename), 'r') as file:
swift_message = file.read()
try:
result = parser.process(swift_message)
# Extract key fields
msg_type = result['block2']['msg_type']
reference = result['block4']['fields'][0]['fieldValue'] # Field 20
# These fields might not exist in all messages
amount = None
currency = None
for field in result['block4']['fields']:
if field['type'] == '32' and field.get('option') == 'A':
amount = field['ast'].get('Amount')
currency = field['ast'].get('Currency')
break
sender = result['block1']['receiving_lt_id']
receiver = result['block2']['bic']
# Store in database
cursor.execute(
"INSERT INTO swift_messages (msg_type, reference, amount, currency, sender, receiver, raw_message, parsed_data) VALUES (?, ?, ?, ?, ?, ?, ?, ?)",
(msg_type, reference, amount, currency, sender, receiver, swift_message, json.dumps(result))
)
except Exception as e:
print(f"Error processing {filename}: {e}")
# Commit changes and close connection
conn.commit()
conn.close()
from flask import Flask, request, jsonify
from swift_parser_py.swift_parser import SwiftParser
app = Flask(__name__)
parser = SwiftParser()
@app.route('/parse', methods=['POST'])
def parse_message():
if 'message' not in request.json:
return jsonify({'error': 'No message provided'}), 400
swift_message = request.json['message']
try:
result = parser.process(swift_message)
return jsonify(result)
except Exception as e:
return jsonify({'error': str(e)}), 500
if __name__ == '__main__':
app.run(debug=True)
# In views.py
from django.http import JsonResponse
from django.views.decorators.csrf import csrf_exempt
import json
from swift_parser_py.swift_parser import SwiftParser
parser = SwiftParser()
@csrf_exempt
def parse_swift_message(request):
if request.method == 'POST':
try:
data = json.loads(request.body)
if 'message' not in data:
return JsonResponse({'error': 'No message provided'}, status=400)
swift_message = data['message']
result = parser.process(swift_message)
return JsonResponse(result)
except json.JSONDecodeError:
return JsonResponse({'error': 'Invalid JSON'}, status=400)
except Exception as e:
return JsonResponse({'error': str(e)}, status=500)
return JsonResponse({'error': 'Method not allowed'}, status=405)
import json
import pika
from swift_parser_py.swift_parser import SwiftParser
# Initialize the parser
parser = SwiftParser()
# Set up RabbitMQ connection
connection = pika.BlockingConnection(pika.ConnectionParameters('localhost'))
channel = connection.channel()
channel.queue_declare(queue='swift_messages')
channel.queue_declare(queue='parsed_messages')
def callback(ch, method, properties, body):
try:
# Parse the message
swift_message = body.decode('utf-8')
result = parser.process(swift_message)
# Publish the parsed result to another queue
channel.basic_publish(
exchange='',
routing_key='parsed_messages',
body=json.dumps(result)
)
# Acknowledge the message
ch.basic_ack(delivery_tag=method.delivery_tag)
except Exception as e:
# Handle error
print(f"Error processing message: {e}")
# Reject the message (could be requeued if needed)
ch.basic_nack(delivery_tag=method.delivery_tag, requeue=False)
# Start consuming messages
channel.basic_consume(queue='swift_messages', on_message_callback=callback)
print('Waiting for messages. To exit press CTRL+C')
channel.start_consuming()
For processing large volumes of messages:
import multiprocessing
from swift_parser_py.swift_parser import SwiftParser
import os
import json
def process_file(file_path):
try:
parser = SwiftParser()
with open(file_path, 'r') as file:
swift_message = file.read()
result = parser.process(swift_message)
return {'file': file_path, 'result': result}
except Exception as e:
return {'file': file_path, 'error': str(e)}
def parallel_process_messages(message_dir, output_dir, num_processes=None):
# Get all message files
file_paths = [os.path.join(message_dir, f) for f in os.listdir(message_dir) if f.endswith('.txt')]
# Use multiprocessing to parse messages in parallel
with multiprocessing.Pool(processes=num_processes or multiprocessing.cpu_count()) as pool:
results = pool.map(process_file, file_paths)
# Process results
for item in results:
if 'error' in item:
print(f"Error processing {item['file']}: {item['error']}")
else:
# Save parsed result to JSON file
output_file = os.path.join(output_dir, os.path.basename(item['file']).replace('.txt', '.json'))
with open(output_file, 'w') as f:
json.dump(item['result'], f, indent=2)
print(f"Processed {item['file']} -> {output_file}")
The project includes comprehensive tests in the tests directory:
# Run all tests
python -m unittest discover -s swift_parser_py/tests
# Run specific test files
python -m unittest swift_parser_py.tests.test_block3_parser
python -m unittest swift_parser_py.tests.test_patterns
python -m unittest swift_parser_py.tests.test_comprehensive
Sample test output:
=== SWIFT MESSAGE PARSING RESULTS ===
BLOCK 1 (BASIC HEADER):
Application ID: F
Service ID: 01
Receiving LT ID: EXAMPLEBANK0
Session Number: 0010
Sequence Number: 00001
BLOCK 2 (APPLICATION HEADER):
Message Type: MT103
Direction: I
BIC: RECEIVERBA
Priority: N
BLOCK 3 (USER HEADER):
Tag 108: MSGREF2023
Tag 121: REF-XYZ-789
BLOCK 4 (TEXT BLOCK):
Field 20: CUSTREF2023-001
Field 23B: CRED
Field 32A: 230803USD5000,00
Field 33B: USD5000,00
Field 50K: /87654321...
Field 52A: ORDERBANK
Field 53A: SENDERBANK
Field 57A: RECEIVERBANK
Field 59: /12345678...
Field 70: PAYMENT FOR SERVICES...
Field 71A: SHA
Field 72: /ACC/INTERNAL TRANSFER
The test suite includes:
Contributions are welcome! If you'd like to contribute, please:
import json
from swift_parser_py.swift_parser import SwiftParser
# Load custom patterns
with open('custom_patterns.json', 'r') as file:
custom_patterns = json.load(file)
# Initialize parser with custom patterns
parser = SwiftParser(field_patterns=custom_patterns)
from swift_parser_py.swift_parser import SwiftParser
def validate_swift_message(swift_message):
parser = SwiftParser()
validation_errors = []
try:
result = parser.process(swift_message)
# Check for required fields
required_fields = ['20', '23B', '32A', '50K', '59']
found_fields = [field['type'] for field in result['block4']['fields']]
for field in required_fields:
if field not in found_fields:
validation_errors.append(f"Missing required field: {field}")
# Check for field parsing errors
for field in result['block4']['fields']:
if 'ast' in field and 'error' in field['ast']:
validation_errors.append(f"Field {field['type']}{field.get('option', '')} parsing error: {field['ast']['error']}")
# Validate specific fields
for field in result['block4']['fields']:
if field['type'] == '32' and field.get('option') == 'A':
# Validate date format
date = field['ast'].get('Date', '')
if len(date) != 6:
validation_errors.append(f"Invalid date format in field 32A: {date}")
# Validate currency code
currency = field['ast'].get('Currency', '')
if len(currency) != 3:
validation_errors.append(f"Invalid currency code in field 32A: {currency}")
return {
'valid': len(validation_errors) == 0,
'errors': validation_errors,
'parsed_data': result
}
except Exception as e:
return {
'valid': False,
'errors': [f"Error parsing message: {str(e)}"],
'parsed_data': None
}
Potential areas for future development:
Licensed under the MIT License. See LICENSE for more information.
FAQs
Python-based metadata-driven parser for SWIFT/ISO 15022 messages
We found that swift-parser-py demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
MCP spec updated with structured tool output, stronger OAuth 2.1 security, resource indicators, and protocol cleanups for safer, more reliable AI workflows.
Security News
More than half of CISOs now manage 10+ security areas, often with few legal safeguards and short tenures, yet continue to secure budgets and higher pay.
Security News
Libxml2’s solo maintainer drops embargoed security fixes, highlighting the burden on unpaid volunteers who keep critical open source software secure.