Which of the following is the correct way to define a POST route in FastAPI that accepts JSON input for LangChain processing?

easy📝 Syntax Q3 of 15

LangChain - Production Deployment

A@app.route('/process', methods=['POST']) async def process(data): return {'result': data}

B@app.get('/process') def process(data: dict): return {'result': data}

C@app.post('/process') async def process(data: dict): return {'result': data}

D@app.post('/process') def process(): return {'result': 'no input'}

Step-by-Step Solution

Solution:

Step 1: Identify correct HTTP method and decorator
FastAPI uses @app.post for POST routes.
Step 2: Check function signature for JSON input
The correct signature uses async def process(data: dict) to automatically parse and accept JSON input.
Final Answer:
@app.post('/process') async def process(data: dict): return {'result': data} -> Option C
Quick Check:
Correct POST route with JSON input = @app.post('/process') async def process(data: dict): return {'result': data} [OK]

Quick Trick: Use @app.post and async def with typed parameters [OK]

Common Mistakes:

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