vault backup: 2026-05-15 15:29:41

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Vadym Samoilenko 2026-05-15 15:29:41 +01:00
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- 14:41 — session ended | `Shumiland`
- 14:43 — session ended | `Shumiland`
- 14:43 — session ended | `Shumiland`
- 15:29 (4min) — session ended | `ai_leed`

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@ -35,7 +35,7 @@ This 3-hop pattern works for hundreds of articles without vector search.
| [[wiki/reports/_index\|reports/]] | Weekly and monthly summaries — generate: `uv run python scripts/report-generator.py --weekly` | 1 |
| [[wiki/infrastructure/_index\|infrastructure/]] | Server inventory: all 10 SSH hosts — optical, optical-dev, optical-prod, baic, librechat, modocmms, box-cli, aimpress, pve | 12 |
| [[wiki/testing/_index\|testing/]] | Web app testing: functional, performance, security, UI types; TDD/BDD/Agile methodologies; Selenium/Cypress/Playwright/JMeter/OWASP ZAP tools | 1 |
| [[wiki/payloadcms/_index\|payloadcms/]] | Full Payload CMS reference — getting started, config, database (Postgres/MongoDB/SQLite), all 22 field types, access control, hooks, authentication (cookies, JWT, API keys, custom strategies, token data), admin UI, custom components, Lexical rich text, live preview, versions/drafts, Local/REST/GraphQL APIs, queries, plugins, jobs queue, upload, ecommerce, production deploy, TypeScript, migration guides, i18n, localization | 71 |
| [[wiki/payloadcms/_index\|payloadcms/]] | Full Payload CMS reference — getting started, config, database (Postgres/MongoDB/SQLite), all 22 field types, access control, hooks, authentication (cookies, JWT, API keys, custom strategies, token data), admin UI, custom components, Lexical rich text, live preview, versions/drafts, Local/REST/GraphQL APIs, queries, plugins, jobs queue, upload, ecommerce, production deploy, TypeScript, migration guides, i18n, localization | 72 |
| [[wiki/shared-patterns/_index\|shared-patterns/]] | Oliver Agency standard library patterns: httpx, structlog, pydantic-settings, alembic — reuse before writing from scratch | 4 |
| [[wiki/mistakes/_index\|mistakes/]] | Anti-patterns extracted from sessions — per-stack running lists (fastapi, react, docker, postgres, general) — injected at session start | 5 |

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| [[wiki/payloadcms/fields-email\|Email Field]] | Email field with built-in format validation — unique index, saveToJWT, index, placeholder, autoComplete, custom components | raw/fields__email.md | 2026-05-15 |
| [[wiki/payloadcms/fields-group\|Group Field]] | Nest fields under a shared property (named) or visually group without nesting (presentational); `localized` covers all nested fields at once | raw/fields__group.md | 2026-05-15 |
| [[wiki/payloadcms/fields-join\|Join Field]] | Virtual bi-directional relationship field — zero-overhead reverse lookup, custom junction tables, polymorphic, query options across all APIs | raw/fields__join.md | 2026-05-15 |
| [[wiki/payloadcms/fields-json\|JSON Field]] | Stores native JSON in DB (not string) — jsonSchema validation + Monaco typeahead, local/remote schemas, vs Code Field | raw/fields__json.md | 2026-05-15 |

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---
title: "JSON Field"
aliases: [payload-json-field, json-field-payload]
tags: [payloadcms, fields, json, validation, monaco]
sources: [raw/fields__json.md]
created: 2026-05-15
updated: 2026-05-15
---
The JSON Field stores raw JSON (object/array/primitive) directly in the database — unlike the [[wiki/payloadcms/fields-code|Code Field]] which stores a plain string. The Admin Panel shows a Monaco editor with full JSON syntax highlighting.
## Config
```ts
import type { Field } from 'payload'
export const MyJSONField: Field = {
name: 'customerJSON',
type: 'json',
required: true,
}
```
## Config Options
| Option | Description |
|--------|-------------|
| `name` * | DB property name |
| `jsonSchema` | JSON Schema for validation + editor typeahead |
| `label` | Admin Panel label (string or i18n object) |
| `unique` | DB-level unique index |
| `index` | DB index for faster queries |
| `validate` | Custom validation function (client + server) |
| `saveToJWT` | Include in JWT if field is top-level in auth collection |
| `hooks` | Field lifecycle hooks |
| `access` | Field-level access control |
| `hidden` | Hide from all APIs + Admin (still saved to DB) |
| `defaultValue` | Default value |
| `localized` | Enable per-locale content |
| `required` | Make field mandatory |
| `virtual` | Disable DB column (`true`) or link to a relationship (`string path`) |
| `typescriptSchema` | Override generated TS type with JSON schema |
| `admin.editorOptions` | Pass options to Monaco editor |
## JSON Schema Validation
Attach a `jsonSchema` to enable:
- **Editor typeahead** — Monaco auto-completes properties and enums in the Admin Panel
- **Save-time validation** — invalid documents cannot be saved
### Local Schema
```ts
{
name: 'customerJSON',
type: 'json',
jsonSchema: {
uri: 'a://b/foo.json', // required (any unique URI)
fileMatch: ['a://b/foo.json'], // required (must match uri)
schema: {
type: 'object',
properties: {
foo: { enum: ['bar', 'foobar'] },
},
},
},
}
// {"foo": "bar"} ✓ {"foo": "other"} ✗
```
### Remote Schema
```ts
{
name: 'customerJSON',
type: 'json',
jsonSchema: {
uri: 'https://example.com/customer.schema.json',
fileMatch: ['https://example.com/customer.schema.json'],
// schema omitted — Payload fetches it from the URL
},
}
```
> **Gotcha:** If the remote URL is not publicly accessible, Payload will fail to fetch the schema. Embed the schema inline or import it from a local file.
## JSON vs Code Field
| | JSON Field | [[wiki/payloadcms/fields-code|Code Field]] |
|--|------------|------------|
| DB storage | Native JSON / JSONB | Plain string |
| Editor | Monaco (JSON mode) | Monaco (any language) |
| Validation | JSON Schema supported | Custom `validate` only |
| Use case | Structured data, API configs, metadata | Source code snippets, templates |
## Custom Components
Both Server and Client component patterns are supported. Import `JSONField` from `@payloadcms/ui`:
```tsx
// Server
import { JSONField } from '@payloadcms/ui'
import type { JSONFieldServerComponent } from 'payload'
export const CustomJSONFieldServer: JSONFieldServerComponent = ({
clientField, path, schemaPath, permissions,
}) => <JSONField field={clientField} path={path} schemaPath={schemaPath} permissions={permissions} />
// Client
'use client'
import type { JSONFieldClientComponent } from 'payload'
export const CustomJSONFieldClient: JSONFieldClientComponent = (props) => <JSONField {...props} />
```
## Key Takeaways
- `type: 'json'` stores actual JSON in the DB (not a stringified value) — use this when you need to query or index the JSON contents later
- `jsonSchema` unlocks both Monaco typeahead in the Admin Panel and automatic save-time validation — add it for any structured config or metadata field
- For remote schemas: if the URL is not public, embed the schema inline to avoid fetch failures
- `admin.editorOptions` accepts the full Monaco `EditorOptions` object for advanced editor configuration
- Use [[wiki/payloadcms/fields-code|Code Field]] instead when storing source code, templates, or any non-JSON string that just needs syntax highlighting
## Sources
- [Payload CMS — JSON Field docs](https://payloadcms.com/docs/fields/json)
- Raw file: `raw/fields__json.md`