plos-open-access-api

PLOS Search API

Overview

PLOS (Public Library of Science) publishes 7 peer-reviewed open access journals covering biology, medicine, genetics, and more. The Search API provides Solr-powered full-text search across all PLOS content — 350K+ articles, all freely available under CC-BY licenses. No authentication required. Particularly valuable for biomedical and life sciences systematic reviews.

API Endpoint

Base URL

https://api.plos.org/search

Search Examples

# Basic keyword search
curl "https://api.plos.org/search?q=CRISPR+gene+editing&rows=20&wt=json"

# Search in specific fields
curl "https://api.plos.org/search?q=title:\"machine learning\"+AND+abstract:biomarker&wt=json"

# Filter by journal
curl "https://api.plos.org/search?q=microbiome&fq=journal:\"PLOS ONE\"&wt=json"

# Filter by date range
curl "https://api.plos.org/search?q=COVID-19+vaccine&\
fq=publication_date:[2024-01-01T00:00:00Z TO 2026-12-31T23:59:59Z]&wt=json"

# Filter by article type
curl "https://api.plos.org/search?q=climate+change&fq=article_type:\"Research Article\"&wt=json"

# Return specific fields only
curl "https://api.plos.org/search?q=deep+learning&fl=id,title,author,publication_date,score&wt=json"

Search Fields

| Field | Description | Example |

|-------|-------------|---------|

| title | Article title | title:"attention mechanism" |

| abstract | Abstract text | abstract:neural+network |

| body | Full text body | body:transformer |

| author | Author name | author:"Vaswani" |

| subject | Subject area | subject:"Neuroscience" |

| journal | Journal name | journal:"PLOS Medicine" |

Query Parameters

| Parameter | Description | Default |

|-----------|-------------|---------|

| q | Solr query (supports AND/OR/NOT) | Required |

| fq | Filter query (narrows without affecting score) | None |

| fl | Fields to return (comma-separated) | All |

| rows | Results per page (max 999) | 10 |

| start | Pagination offset | 0 |

| sort | Sort order | score desc |

| wt | Format: json or xml | xml |

| hl | Enable highlighting | false |

Available Return Fields

| Field | Type | Description |

|-------|------|-------------|

| id | string | DOI |

| title | string | Article title |

| author | array | Author names |

| abstract | string | Abstract text |

| body | string | Full text (large) |

| publication_date | date | Publication date |

| journal | string | Journal name |

| article_type | string | Article type |

| subject | array | Subject categories |

| score | float | Relevance score |

PLOS Journals

| Journal | Scope |

|---------|-------|

| PLOS ONE | Multidisciplinary |

| PLOS Biology | Life sciences |

| PLOS Medicine | Clinical medicine |

| PLOS Genetics | Genetics and genomics |

| PLOS Computational Biology | Computational biology |

| PLOS Pathogens | Infectious disease |

| PLOS Neglected Tropical Diseases | Tropical medicine |

Python Usage

import requests

BASE_URL = "https://api.plos.org/search"


def search_plos(query: str, rows: int = 20,
                journal: str = None,
                from_date: str = None,
                fields: str = None) -> list:
    """Search PLOS open access articles."""
    params = {
        "q": query,
        "wt": "json",
        "rows": rows,
        "fl": fields or "id,title,author,abstract,publication_date,journal,score",
    }

    fq_parts = []
    if journal:
        fq_parts.append(f'journal:"{journal}"')
    if from_date:
        fq_parts.append(
            f"publication_date:[{from_date}T00:00:00Z TO NOW]"
        )
    if fq_parts:
        params["fq"] = " AND ".join(fq_parts)

    resp = requests.get(BASE_URL, params=params)
    resp.raise_for_status()
    data = resp.json()

    results = []
    for doc in data.get("response", {}).get("docs", []):
        results.append({
            "doi": doc.get("id"),
            "title": doc.get("title"),
            "authors": doc.get("author", []),
            "date": doc.get("publication_date", "")[:10],
            "journal": doc.get("journal"),
            "abstract": (doc.get("abstract", [""])[0])[:300]
                        if isinstance(doc.get("abstract"), list)
                        else (doc.get("abstract", ""))[:300],
        })
    return results


def get_full_text(doi: str) -> str:
    """Retrieve full text body of a PLOS article."""
    params = {
        "q": f'id:"{doi}"',
        "fl": "body",
        "wt": "json",
    }
    resp = requests.get(BASE_URL, params=params)
    resp.raise_for_status()
    docs = resp.json().get("response", {}).get("docs", [])
    return docs[0].get("body", "") if docs else ""


# Example: search PLOS Computational Biology
papers = search_plos(
    "protein structure prediction",
    journal="PLOS Computational Biology",
    from_date="2024-01-01",
)
for p in papers:
    print(f"[{p['date']}] {p['title']}")
    print(f"  DOI: {p['doi']}")

# Example: full-text search across all PLOS
papers = search_plos("body:reinforcement+learning AND title:robot")
for p in papers:
    print(f"{p['title']} — {p['journal']}")

Advanced Solr Queries

# Phrase proximity search (words within 5 of each other)
q=abstract:"machine learning"~5

# Boosted field search
q=title:"CRISPR"^2 OR abstract:"CRISPR"

# Wildcard search
q=title:neuro*

# Range query on dates
fq=publication_date:[2024-01-01T00:00:00Z TO 2024-12-31T23:59:59Z]

Rate Limits

No formal rate limit, but PLOS requests courtesy delays of 1 request per second for bulk operations. No authentication needed.

References

• PLOS API Documentation
• PLOS Search Tips
• Solr Query Syntax