# How to convert JSON to TypeScript without sending customer data anywhere

> The six steps engineers follow, and a three-line team policy that keeps production payloads off third-party servers.

URL: https://claudegpt.si/news/how-to-convert-json-to-typescript-locally  
Published: 2026-10-27T15:16:14.485Z  
Author: ClaudeGPT Si Newsroom  
Section: Guides  
Topics: TypeScript, Data privacy, Engineering teams  
Publisher: ClaudeGPT Si

## Key takeaways

- Converting JSON to TypeScript means generating a type from a sample, naming it and marking optional and nullable fields.
- AyeTab JSON to Code does the conversion free in the browser and does not upload the sample to its servers.
- A short team policy, local converters for production data and provider specs where they exist, keeps the task quick and private.

How to convert JSON to TypeScript in short: paste a sample into a type generator, copy the type it writes, then name it and mark the optional fields. The free [AyeTab JSON to Code tool](https://app.ayetab.com/tools/json-to-code) does the generating in the browser, so the customer data inside your sample never leaves the laptop.

For a team, the second half of that sentence is the part worth a policy.

## Why operators should care about a developer chore

Types for API payloads are how a TypeScript codebase stays honest about the data it handles. When a partner changes a field, the compiler points at every place that breaks. Engineers generate these types all the time, usually from a real response they just copied.

That real response is the problem. It can hold names, emails, addresses, order totals or a session token. If the converter is a website that processes input on its server, that data has now been sent to a third party nobody on the team vetted. No one meant to do it; it was just the first search result.

## The steps

1. **Capture a sample.** Copy a response from the browser's network tab, a log or a `curl` call.
2. **Open a local converter.** Go to [app.ayetab.com/tools/json-to-code](https://app.ayetab.com/tools/json-to-code). It runs in the browser and does not upload the input to AyeTab's servers.
3. **Generate.** Paste the JSON and keep TS selected. Pick Go if the service is written in Go.
4. **Copy and name it.** The output is a type called `Root`. Rename it after the thing it describes, such as `Invoice` or `Shipment`.
5. **Review it.** Mark fields that are sometimes missing with `?` and fields that can be empty as `| null`. One sample cannot show either.
6. **Commit it next to the code that calls the API.**

## A short team policy

You do not need a long document. Three lines in the engineering handbook cover it:

| Rule | Why |
| --- | --- |
| Use a converter that runs locally for any payload from production | Customer data stays on the device |
| Prefer the provider's JSON Schema or OpenAPI spec when one exists | Generated types are then exact, not guessed |
| Review generated types in code review like any other code | Optional and nullable fields get checked |

AyeTab fits the first rule without any procurement step: it is free, there is no account to create, and the web app works in Chrome, Firefox, Edge and Safari. Engineers who want it closer at hand can install the [AyeTab extension for Chrome](https://ayetab.com), which puts the same tools on the new tab page and in a side panel and keeps working offline once installed. Its permissions are limited to the side panel and storage.

## Other ways your engineers may already do it

- **quicktype.** Generates types, serializers and validators in many languages, in the browser, on the command line or through an MCP server for AI agents. Pick it when the team needs more than a type, and that is a fair reason to choose it over AyeTab.
- **Editor extension.** The free Paste JSON as Code extension for VS Code turns clipboard JSON into TypeScript types inside the editor.
- **TypeScript itself.** With `resolveJsonModule` enabled, importing a `.json` file gives you an inferred type for that file.
- **An AI coding agent.** It can write the type too, but the whole payload goes to the model provider and uses your quota. Generating locally and asking the agent only for names or validators is cheaper and keeps the raw data out of the prompt.

## The takeaway for founders

Converting JSON to TypeScript is a two-minute task. The risk is not in the code but in where the sample travels on its way. Point your team at a local tool such as AyeTab JSON to Code, ask for the spec when a vendor has one, and the chore stays both quick and private.

## Frequently asked questions

### What is the fastest way to convert JSON to TypeScript?

Paste a JSON sample into a generator such as AyeTab JSON to Code, keep TS selected and copy the result. Then rename the type and review optional fields.

### Is it safe to paste production JSON into an online converter?

Only if the converter processes it locally. AyeTab runs in the browser and does not upload the input to its servers. With other sites, check how they handle input first.

### Should we generate types from samples or from an API spec?

From the spec when the provider publishes a JSON Schema or OpenAPI file, because it knows which fields are required. Samples are the quick route when no spec exists.

## Sources

- [JSON to TypeScript Online: Go Types Too](https://app.ayetab.com/tools/json-to-code), AyeTab
- [AyeTab](https://ayetab.com), AyeTab
- [quicktype](https://quicktype.io/), quicktype
- [Paste JSON as Code](https://marketplace.visualstudio.com/items?itemName=quicktype.quicktype), Visual Studio Marketplace
- [TSConfig option: resolveJsonModule](https://www.typescriptlang.org/tsconfig/resolveJsonModule.html), TypeScript