JSON Structured Prompting

You can write a FLUX.2 prompt as JSON to organize subjects, styles, and composition in your application. Send it as a string in the prompt field. When to use JSON:

Production workflows requiring consistent structure
Automation and programmatic generation
Complex scenes with multiple subjects and relationships
When you need to iterate on specific elements independently

When natural language works better:

Quick iterations and exploration
Simple, single-subject scenes
When prompt length isn’t a concern
Creative workflows where flexibility matters

Choose the format that is easier to maintain in your workflow and compare results with your own prompts.

The Base Schema

{
  "scene": "overall scene description",
  "subjects": [
    {
      "description": "detailed subject description",
      "position": "where in frame",
      "action": "what they're doing"
    }
  ],
  "style": "artistic style",
  "color_palette": ["#hex1", "#hex2", "#hex3"],
  "lighting": "lighting description",
  "mood": "emotional tone",
  "background": "background details",
  "composition": "framing and layout",
  "camera": {
    "angle": "camera angle",
    "lens": "lens type",
    "depth_of_field": "focus behavior"
  }
}

Building a Prompt Step by Step

Build a product shot incrementally to see how each element contributes.

Step 1: Generating a coffee mug

{
  "scene": "Professional studio product photography setup with polished concrete surface",
  "subjects": [
    {
      "description": "Minimalist ceramic coffee mug with steam rising from hot coffee inside",
      "pose": "Stationary on surface",
      "position": "Center foreground on polished concrete surface",
      "color_palette": ["matte black ceramic"]
    }
  ],
  "style": "Ultra-realistic product photography with commercial quality",
  "color_palette": ["matte black", "concrete gray", "soft white highlights"],
  "lighting": "Three-point softbox setup creating soft, diffused highlights with no harsh shadows",
  "mood": "Clean, professional, minimalist",
  "background": "Polished concrete surface with studio backdrop",
  "composition": "rule of thirds",
  "camera": {
    "angle": "high angle",
    "distance": "medium shot",
    "focus": "Sharp focus on steam rising from coffee and mug details",
    "lens-mm": 85,
    "f-number": "f/5.6",
    "ISO": 200
  }
}

Professional product shot of a single black coffee mug with steam — Step 1: Single matte black mug with steam

Step 2: Adding a second mug in a different color

{
  "scene": "Professional studio product photography setup with polished concrete surface",
  "subjects": [
    {
      "description": "Minimalist ceramic coffee mug with steam rising from hot coffee inside",
      "pose": "Stationary on surface",
      "position": "Center foreground on polished concrete surface",
      "color_palette": ["matte black ceramic"]
    },
    {
      "description": "Minimalist ceramic coffee mug, matching design to the black mug",
      "pose": "Stationary on surface",
      "position": "Right side of the black mug on polished concrete surface",
      "color_palette": ["matte yellow ceramic"]
    }
  ],
  "style": "Ultra-realistic product photography with commercial quality",
  "color_palette": ["matte black", "matte yellow", "concrete gray", "soft white highlights"],
  "lighting": "Three-point softbox setup creating soft, diffused highlights with no harsh shadows",
  "mood": "Clean, professional, minimalist",
  "background": "Polished concrete surface with studio backdrop",
  "composition": "rule of thirds",
  "camera": {
    "angle": "high angle",
    "distance": "medium shot",
    "focus": "Sharp focus on steam rising from coffee and both mugs in frame",
    "lens-mm": 85,
    "f-number": "f/5.6",
    "ISO": 200
  }
}

Product shot with black and yellow coffee mugs — Step 2: Added a yellow mug to the composition

Step 3: Change the color of the steam

{
  "scene": "Professional studio product photography setup with polished concrete surface",
  "subjects": [
    {
      "description": "Minimalist ceramic coffee mug with bright red steam rising from hot coffee inside",
      "pose": "Stationary on surface",
      "position": "Center foreground on polished concrete surface",
      "color_palette": ["matte black ceramic", "bright red steam"]
    },
    {
      "description": "Minimalist ceramic coffee mug, matching design to the black mug",
      "pose": "Stationary on surface",
      "position": "Right side of the black mug on polished concrete surface",
      "color_palette": ["matte yellow ceramic"]
    }
  ],
  "style": "Ultra-realistic product photography with commercial quality",
  "color_palette": ["matte black", "matte yellow", "bright red", "concrete gray", "soft white highlights"],
  "lighting": "Three-point softbox setup creating soft, diffused highlights with no harsh shadows",
  "mood": "Clean, professional, minimalist",
  "background": "Polished concrete surface with studio backdrop",
  "composition": "rule of thirds",
  "camera": {
    "angle": "high angle",
    "distance": "medium shot",
    "focus": "Sharp focus on steam rising from coffee and both mugs in frame",
    "lens-mm": 85,
    "f-number": "f/5.6",
    "ISO": 200
  }
}

Product shot with black and yellow mugs, red steam rising from the black mug — Step 3: Changed the steam color to bright red

You can include the JSON directly in your prompt, or flatten it into natural language. FLUX.2 understands both formats.

For precise brand color matching with hex codes, see HEX Color Prompting.

Video Generation with FLUX

Image Generation with FLUX

Image Editing with FLUX

Use Cases with FLUX

The Base Schema

Building a Prompt Step by Step

Step 1: Generating a coffee mug

Step 2: Adding a second mug in a different color

Step 3: Change the color of the steam

​The Base Schema

​Building a Prompt Step by Step

​Step 1: Generating a coffee mug

​Step 2: Adding a second mug in a different color

​Step 3: Change the color of the steam

The Base Schema

Building a Prompt Step by Step

Step 1: Generating a coffee mug

Step 2: Adding a second mug in a different color

Step 3: Change the color of the steam