JSON Prompting: Practical Guide for LLMs with Python Coding Example

Import os
Getpass Import
os.environ["OPENAI_API_KEY"] = getpass('Enter OpenAI API Key: ')

OpenAI can be imported from OpenAI
OpenAI client()

After reading this email, summarize it and make a list of the next steps.

Email:
Hello team. Let's finish the marketing plan before Tuesday. Alice prepare the first draft, Bob handle the design.

prompt_text = """
List the actions that you will take after reading the email.

Email:
Hello team. Let's finish the marketing plan before Tuesday. Alice prepare the first draft, Bob handle the design.
"""

response_text = client.chat.completions.create(
    model="gpt-5",
    messages=[{"role": "user", "content": prompt_text}]
)

text_output = response_text.choices[0].message.content
print(text_output)

Summary:
By Tuesday, the team must finalize its marketing plan. Alice will draft the document, while Bob will design it.

Take Action:
Do you have a draft marketing plan?
Bob: Finish the design before Tuesday.
Finalize your marketing plan for Tuesday.

prompt_json = """
The output must be strictly JSON.

 high"


Email:
Hello team. Let's finish the marketing plan before Tuesday. Alice prepare the first draft, Bob handle the design.
"""

response_json = client.chat.completions.create(
    model="gpt-5",
    messages=[
        {"role": "system", "content": "You are a precise assistant that always replies in valid JSON."},
        {"role": "user", "content": prompt_json}
    ]
)

json_output = response_json.choices[0].message.content
print(json_output)

{
  "summary": "Finalize the marketing plan by Tuesday; Alice to draft and Bob to handle design.",
  "action_items": [
    "Alice: prepare the draft",
    "Bob: handle the design",
    "Team: finalize the marketing plan by Tuesday"
  ],
  "priority": "medium"
}

plain_text_prompt = """
Review the market updates below:

Market Text
Tesla's Q2 results exceeded expectations thanks to increased Model Y sales. However, rising BYD competition is a threat.
Apple's revenue grew steadily, driven by iPhone sales. However, services revenues fell slightly.
Amazon AWS is still the dominant cloud computing provider in Europe, despite increasing regulatory scrutiny.

Generate:
Market summary in two lines
The sentiment of each company. (positive,negative,neutral)
Important growth risks and opportunities
Score of confidence from 0-10
"""

response_plain = client.chat.completions.create(
    model="gpt-5",
    messages=[{"role": "user", "content": plain_text_prompt}]
)

plain_output = response_plain.choices[0].message.content
print(plain_output)

Summary of the Market
- Updates on earnings are largely constructive. Tesla beat Q2 expectations with a successful Model Y. Apple grew iPhone revenue, while AWS continues to be the cloud leader.
Apple Services are on the decline, BYD is putting pressure on Tesla. Amazon's European reputation has also been gaining more scrutiny.

Sentiment:
Tesla: Positive
- Apple: Neutral
Amazon: Positive

Growth opportunities and Risks:
Tesla
 - Opportunity: Maintain Model Y momentum, scale up production and price to increase volume.
 The increasing competition by BYD may put pressure on share and margins.
Apple
 Opportunity: Monetize the large iPhone user base, re-accelerate service delivery via bundles or ecosystem engagement.
 Risks: Softening of services; reliance on iPhone to drive top line growth.
Amazon Web Services (AWS).
 Opportunity: Use leadership to secure more AI workloads for enterprises and long-term commitments.
 - Risques: European regulation scrutiny can lead to penalties, costs of compliance, and contract/pricing restrictions.

Confidence Score: 7/10

json_prompt = """
The following is a market update that you can analyze and then return your response to in JSON format.

{
  "summary": "2-line market overview",
  "companies": [
     negative 
  ],
  "confidence_score": "integer (0-10)"
}

Market Text
Tesla's Q2 results exceeded expectations thanks to increased Model Y sales. However, rising BYD competition is a threat.
Apple's revenue is growing steadily, driven by iPhone sales. However, services revenues are slightly down.
Amazon AWS is still the dominant cloud computing provider in Europe, despite increased regulatory scrutiny.
"""

response_json = client.chat.completions.create(
    model="gpt-5",
    messages=[
        {"role": "system", "content": "You are a precise assistant that always outputs valid JSON."},
        {"role": "user", "content": json_prompt}
    ]
)

json_output = response_json.choices[0].message.content
print(json_output)

{
  "summary": "Markets saw mixed corporate updates: Tesla beat expectations on strong Model Y sales and AWS maintained cloud leadership.nHowever, Apple's growth was tempered by softer services revenue while Tesla and AWS face competition and regulatory risks.",
  "companies": [
    {
      "name": "Tesla",
      "sentiment": "positive",
      "opportunities": [
        "Leverage strong Model Y demand to drive revenue and scale production",
        "Sustain earnings momentum from better-than-expected Q2 results"
      ],
      "risks": [
        "Intensifying competition from BYD",
        "Potential price pressure impacting margins"
      ]
    },
    {
      "name": "Apple",
      "sentiment": "neutral",
      "opportunities": [
        "Build on steady iPhone-driven revenue growth",
        "Revitalize Services to reaccelerate growth"
      ],
      "risks": [
        "Slight decline in services revenue",
        "Reliance on iPhone as the primary growth driver"
      ]
    },
    {
      "name": "Amazon (AWS)",
      "sentiment": "positive",
      "opportunities": [
        "Capitalize on cloud leadership to win new enterprise workloads",
        "Expand higher-margin managed services and deepen customer spend"
      ],
      "risks": [
        "Increasing regulatory scrutiny in Europe",
        "Potential compliance costs or operational restrictions"
      ]
    }
  ],
  "confidence_score": 8
}