---
title: "Deploy JSON Field Project"
description: "Select named fields from each JSON object"
category: "Automation"
url: https://railway.com/deploy/json-field-project
---

# Deploy JSON Field Project

Select named fields from each JSON object

**[Deploy JSON Field Project on Railway](https://railway.com/template/json-field-project)**

Machine-readable deploy manifest (JSON, validated by TemplateCI): https://railway.com/deploy/json-field-project/manifest.json

- **Creator:** dankeewithtwoes's Projects
- **Category:** Automation

## Template content

### Tool

- **Image:** python:3.13-slim
- **Start command:** `python -c "import base64,os;exec(compile(base64.b64decode(os.environ['TOOL_CODE']),'tool.py','exec'))"`
- **Health check:** /health
- **Public domain:** Yes

## Documentation

# Deploy and Host JSON Field Project on Railway

Select named fields from each JSON object.

## About Hosting JSON Field Project

This is a stateless JSON tool. Deploy it, copy TOOL_TOKEN from service variables and send it as an Authorization: Bearer header on POST /run. The /health endpoint is public and returns readiness only. Inputs are limited to 64 KiB. The application does not store requests or call a model.

## Why Deploy JSON Field Project

Call a deterministic operation from an agent, workflow or application without an LLM API key.

## Common Use Cases

- Select named fields from each JSON object.
- Insert a deterministic check or transformation in a workflow.
- Repeat the documented example in a regression check.

## Dependencies for JSON Field Project

- Python 3.13 container and a Railway project.
- An HTTP client with your generated bearer token.

### Example input for POST /run

```json
{"fields": ["a"], "rows": [{"a": 1, "b": 2}]}
```

### Expected response

```json
{"result": [{"a": 1}]}
```

The single process is intended for small internal workloads. Set concurrency and load limits upstream before serving high volume traffic.


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Open this page in a browser: https://railway.com/deploy/json-field-project