The short answer
Tables help people read; formats such as JSON (a text format for fields and values) help programs process data. Valid structure can still contain wrong facts.
Try it in three steps
- Select only four or five necessary fields.
- Distinguish unknown from none and attach currencies to amounts.
- Test with an incomplete sample.
A practice prompt
Before you start
This table exercise requires no JSON knowledge.
Practice material (fictional)
Input: screws 8 boxes; washer quantity unknown. Use item, quantity, unit and questions columns.Replace placeholders in the prompt with this material, or append the material if there are no placeholders. Reading time excludes doing the exercise.
Return a table with item, quantity, unit and questions. Add no columns and mark unknown quantities as unknown, not zero.What to look for (not a recorded test result)
Screws have quantity 8 and unit boxes; washer quantity and unit remain unknown. Validate JSON separately if using programmatic output.
If it goes wrong
If fields drift, simplify them and add edge examples; a table-like appearance is not enough.
Check your result
Fields have clear meanings and missing values cannot be mistaken for business numbers.
References and scope
The links below support the concepts or product navigation. The steps and exercises are our teaching suggestions, not official certification or measured customer outcomes. Product interfaces and availability may change. References checked on 2026-10-17.