openjung-api

name

openjung-api

description

Guide for integrating with the OpenJung (OEJTS) personality test API - a free, open-source alternative to MBTI. Use when building applications that need personality assessment, integrating MBTI-style tests, or working with the OpenMBTI API endpoints. Covers: (1) Fetching test questions, (2) Submitting answers and calculating results, (3) Understanding the scoring system, (4) Recording test sessions, (5) Retrieving aggregate statistics.

OpenJung API Integration

OpenJung is an open-source personality test based on OEJTS (Open Extended Jungian Type Scales) - a validated 32-question assessment that determines MBTI-compatible personality types.

Base URL: https://openmbti.org

Quick Start

Minimal Integration (3 Steps)

// 1. Fetch questions
const { questions } = await fetch('https://openmbti.org/api/questions').then(r => r.json());

// 2. Collect user answers (32 questions, values 1-5)
const answers = { "1": 3, "2": 5, /* ... all 32 */ "32": 4 };

// 3. Calculate result
const { result } = await fetch('https://openmbti.org/api/calculate', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({ answers })
}).then(r => r.json());

console.log(result.type); // "ENFP"

API Endpoints

GET /api/questions

Fetch all 32 test questions.

GET /api/questions?locale=en

Response:

{
  "totalQuestions": 32,
  "questions": [
    {
      "id": 1,
      "dimension": "JP",
      "leftTrait": "Makes lists",
      "rightTrait": "Relies on memory"
    }
  ]
}

POST /api/calculate

Calculate personality type from answers.

POST /api/calculate
{
  "answers": { "1": 3, "2": 5, ... "32": 4 },
  "locale": "en",    // optional
  "save": true       // optional - saves to database
}

Response:

{
  "result": {
    "type": "ENFP",
    "scores": { "EI": 18, "SN": 28, "TF": 22, "JP": 32 },
    "percentages": { "E": 75, "I": 25, "S": 12, "N": 88, "T": 31, "F": 69, "J": 0, "P": 100 },
    "typeInfo": {
      "name": "Campaigner",
      "description": "...",
      "strengths": ["..."],
      "weaknesses": ["..."]
    },
    "shareUrl": "https://openmbti.org/type/enfp?ei=18&sn=28&tf=22&jp=32"
  },
  "recordId": "uuid"
}

POST /api/record

Record a completed test result (fire-and-forget).

POST /api/record
{
  "answers": { ... },
  "result": { "type": "ENFP", "scores": {...}, "percentages": {...} }
}

GET /api/stats

Get aggregate test statistics.

{
  "totalTests": 15234,
  "typeDistribution": [{ "type": "INFP", "count": 2341 }],
  "localeDistribution": [{ "locale": "en", "count": 8234 }]
}

Scoring System

Scale: 1-5 Likert (1 = strongly left trait, 5 = strongly right trait)

Dimensions (8 questions each):

• EI: Extroversion (E) ↔ Introversion (I)
• SN: Sensing (S) ↔ Intuition (N)
• TF: Thinking (T) ↔ Feeling (F)
• JP: Judging (J) ↔ Perceiving (P)

Score Range: 8-40 per dimension (8 questions × 1-5 scale)

Threshold: 24 (midpoint)

• Score ≤ 24 → left preference (E, S, F, J)
• Score > 24 → right preference (I, N, T, P)

Note: TF dimension is inverted - low score = F (Feeling), high = T (Thinking)

Question Mapping

Dimension	Question IDs
JP	1, 5, 9, 13, 17, 21, 25, 29
TF	2, 6, 10, 14, 18, 22, 26, 30
EI	3, 7, 11, 15, 19, 23, 27, 31
SN	4, 8, 12, 16, 20, 24, 28, 32

Localization

44 languages supported. Pass locale parameter to endpoints:

• en (English), zh (Simplified Chinese), ja (Japanese), ko (Korean)
• es (Spanish), fr (French), de (German), pt (Portuguese)
• And 36 more...

Error Handling

Error Code	Description
INVALID_BODY	Malformed JSON
INVALID_PARAMS	Missing/wrong answers format
INCOMPLETE_ANSWERS	Not all 32 questions answered
CALCULATION_FAILED	Server error

Resources

For detailed API specifications and TypeScript types, see references/api_reference.md.