Jadpo is experimental and not ready for production. These docs follow the compiler's main branch as of 5 Nov 2026. What's built · Install 0.3.0
jadpo
ReferenceWeb and network

LanguageValues and typesStandard typesWeb and network

ProblemDetails

On this page

An HTTP API's error body, as other APIs often send one.

Use it to read errors from an outside service. In your own routes, declare failures instead.

Shape

Field Type Required?
type Url No
status HttpStatus No
title Text No
detail Text No
instance Url No

Write every field when you build one, and give a field that isn't required as none.

Example

example
ProblemDetails {    type: none    status: 404    title: "Not Found"    detail: none    instance: none}

Good to know

  • == tells you whether two are the same. < and list.sort_by don't take it, so sort by one of its parts instead.

In JSON

An object of its parts, in a request, a response or json.write:

json
{"type":"https://example.com/probs/out-of-credit","status":403,"title":"You do not have enough credit.","detail":"You have 30 credits, but that costs 50.","instance":"https://example.net/account/12345/msgs/abc"}{"status":404,"title":"Not Found"}{"status":503}

When you read one, a field that isn't required may be left out, or sent as null.

Details

Text form, storage, how it is shown, and operations

ProblemDetails is in the group Web and network, and has been in Jadpo since 0.1.0.

Text form

It has no single text form, so text.from and text.parse don't take it.

How it is stored

It is stored in 5 columns, each named for the field, _ and its suffix. This is {"status":503}:

Column Type Holds
<field>_type text NULL::text
<field>_status smallint 503
<field>_title text NULL::text
<field>_detail text NULL::text
<field>_instance text NULL::text

How it is shown to people

text.format(value, locale:) shows it to people in their locale.

With locale: Locale.en_gb:

Value Shown
{"type":"https://example.com/probs/out-of-credit","status":403,"title":"You do not have enough credit.","detail":"You have 30 credits, but that costs 50.","instance":"https://example.net/account/12345/msgs/abc"} "You do not have enough credit.\nYou have 30 credits, but that costs 50."
{"status":404,"title":"Not Found"} Not Found
{"status":503} 503
{} about:blank

Operations

It also takes text.format, json.read, json.write and ==. How every standard type behaves says how they work.

Markdown for agents: /docs/types/type-problem-details.md.Built from Jadpo main at aee2e8f.