How many tokens does my JSON payload use?
Teams sending structured data to LLMs use this to count tokens in a JSON payload. Token counts drive both cost and whether your prompt even fits, so this page turns your text and settings into exact figures you can act on.
Results update automatically as you type.
- Estimated tokens
- 0
- Words
- 0
- Characters
- 0
- Input cost at this model(GPT-5)
- $0.0000
Why this isn't trivial
The part people underestimate: JSON's keys, quotes and braces add substantial token overhead beyond the actual values. In practice the biggest savings come from trimming keys and whitespace or using a compact format, so it is worth modelling before you commit.
How it's calculated
We estimate this by tokenizing the JSON and pricing it at the input rate. Every figure uses the current provider prices baked into the site (reviewed daily), and you can override any input to match your own assumptions.
Frequently asked questions
Is JSON token-heavy?+
Yes — repeated keys and punctuation add overhead on every payload.
How do I shrink it?+
Use short keys, drop whitespace, or send only necessary fields.
Are these prices up to date?+
Yes. The model prices behind this calculator are refreshed and reviewed daily, so your estimate reflects current provider rates rather than a stale snapshot.
Related
Estimates for planning. Pricing data last reviewed 28 July 2026.