JSON to Prompt Schema
Free online JSON to prompt converter, no installation required. Convert JSON structure to AI prompt instructions
About JSON to Prompt
Converts a sample JSON object into a schema-style prompt you can paste into an LLM to ask for a matching response. The generator walks the JSON recursively and emits each field as `- "key": <inferred type>` (number, string, boolean, null, nested object, or array of <type>), then wraps the structure in a fixed instruction template that demands valid JSON only.
How to Use
1. Paste a JSON object into the Input textarea (use Load Sample to drop in an example with nested address and a projects array). 2. The Output card renders the prompt live; if the JSON is malformed you see an Invalid JSON error, and if the parsed value is not an object you see a Not an Object error. 3. Click Copy to copy the generated prompt.
Type Inference Rules
null becomes `null`, booleans become `boolean`, numbers become `number`, strings become `string`. Arrays are described as `array of:` followed by the type of their first element (or `array (empty)` when the array has no items). Objects become `object with:` and then list each key indented one level deeper, so nested structures recurse and emit a tree rather than the original values.
▶Does the output preserve my actual values?
▶How are arrays described?
▶What if I paste a JSON array or primitive at the top level?
▶Is my data sent to a server?
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