ncbi-eutils

This package is a JavaScript wrapper for NCBI's E-utilities API documented at http://www.ncbi.nlm.nih.gov/books/NBK25500/. It uses ES6 promises to support "piping" to combine successive E-utility calls, e.g. piping esearch results to elink, then piping its result to esummary. This can be used in node (CommonJS) or the browser.

Usage

Access a single eutil:

  var eutils = require('ncbi-eutils');
  eutils.esearch({db:'gene', term: 'foxp2[sym] AND human[orgn]'})
    .then(function(d){console.log(d)}) 

Basic data pipelines: esearch -> esummay

  eutils.esearch({db:'gene', term: 'ltf[sym] AND human[orgn]'})
    .then(eutils.esummary)
    .then(function(d){console.log(d)})

More complex data pipelines: esearch -> elink -> esummary

  eutils.esearch({db: 'protein', term: '15718680[UID]'})
    .then(eutils.elink({dbto:'gene'}))
    .then(function(d) {
      //supported eutil parameters can be added like this
      d.retstart = 5;
      return eutils.esummary(d);
    })
    .then(function (d) {console.log(d)})
    .catch(function (d) {console.log(d)});

Install

npm install --save ncbi-eutils

or in a browser

<script src="ncbi-eutils.min.js"></script>
<script>
      var eutils = require('ncbi-eutils');
      ...
</script>

API

All calls in this package return a promise object. To get the return values, pass a function to .then() or .catch() to get the results and errors, respectively. Alternatively, pass another eutil function to .then() to create a data pipeline. For detailed descriptions of each E-utility, please visit NCBI's documentations.

eutils.einfo([db])

If db is specified, return all metadata for that database. Otherwise, return the list of all available NCBI databases. To see a live example of this, go to: http://linjoey.github.io/ncbi-eutils/docs/dbinfo.html.

eutils.esearch(options)

Provides a list of UIDs matching a text query

options.db a valid NCBI database name

options.term a valid search term

eutils.esummary(options)

Returns document summaries (DocSums) for a list of input UIDs

options.db a valid NCBI database name

options.id array of ids to pass to esummary e.g ['12345', '67890']. Only required if called as the start of a pipeline.

eutils.efetch(options)

Returns formatted data records for a list of input UIDs

options.db a valid NCBI database name

options.id array of ids to pass to efetch e.g ['12345', '67890']. Only required if called as the start of a pipeline.

eutils.elink(options)

Returns UIDs linked to an input set of UIDs in either the same or a different Entrez database

options.dbto a valid NCBI database name

options.dbfrom a valid NCBI database name. Only required if called as the start of a pipeline.

options.id array of ids to pass to esummary e.g ['12345', '67890']. Only required if called as the start of a pipeline.

Dev Agenda

• [ ] Fix up efetch to support more user options
• [x] test complex pipelines e.g. esearch | elink | efetch
• [ ] implement other eutils: espell, egquery, ecitmatch?
• [x] implement convenience calls for esearch -> esummary
• [ ] write test test test
• [ ] elink-> results dont have auto history server, relinking to other eutils use manual id passing. Implement epost to support large tasks

NCBI Copyright & Disclaimers

Please visit http://www.ncbi.nlm.nih.gov/About/disclaimer.html for NCBI's copyright notice.

License

MIT