DocGen Guide 128 tools · prices checked 20 Oct 2026 Find my tool
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JSON API to DOCX for contracts: 22 document generation tools

For contracts, we list 22 tools that turn JSON sent to an API into a Word document. The lowest paid starting price is $19 a month, from DocuGenerate. The first three in our order are Conga Composer, Formstack Documents and Carbone.

Tools
22
With USD price
12, from $19
Free tier
11
Direct / via Zapier
17 / 5
Checked
20 Oct 2026
  1. 01
    Conga Composer Editor's pick conga.com

    Enterprise Salesforce document generation.

    Outputs PDF, DOCX, XLSX, PPTX, HTML, email Template Word Also reads Salesforce G2 4.4 (849)
    Not published
  2. 02
    Formstack Documents Editor's pick formstack.com

    Formerly WebMerge. Only in Suite plan, $250/mo paid annually, 250 deliveries/mo.

    Outputs PDF, DOCX, PPTX, e-sign documents Template Word, PDF form, Visual builder Also reads Salesforce, HubSpot, Airtable, built-in forms +2 G2 4.5 (148)
    $250 / mo
  3. 03
    Carbone Editor's pick carbone.io

    Priced in EUR: Essential EUR 29/mo (EUR 26 annual).

    Outputs PDF, DOCX, XLSX, PPTX, HTML Template Word Also reads Airtable, Zapier/Make/n8n
    $28 EUR 26, converted
  4. 04
    Xpertdoc xpertdoc.com

    CCM and document generation with Microsoft Dynamics CRM connector.

    Outputs PDF, DOCX, email, e-sign documents Template Word G2 4.3 (26)
    On request
  5. 05
    Knackly knackly.io

    Legal document automation.

    Outputs DOCX, PDF Template Word Also reads built-in forms, Zapier/Make/n8n
    $209 / mo
  6. 06
    Docxpresso docxpresso.com

    EUR pricing shown as Core 2500 EUR/user/mo (likely 25.00, formatting unclear).

    Outputs PDF, DOCX Template Word Also reads built-in forms
    $27 EUR 25/user, converted
  7. 07
    docxtemplater docxtemplater.com

    JS library, MIT/GPLv3 core.

    Outputs DOCX, PPTX, XLSX Template Word
    $45 EUR 500/yr, converted
  8. 08
    Foxit Document Generation API developer-api.foxit.com

    Word template plus JSON. Startup $1,750/yr (computed $145.83/mo).

    Outputs PDF, DOCX Template Word
    $145.83 / mo
  9. 09
    Experlogix Document Automation experlogix.com

    Also Dynamics 365, SugarCRM, Power Platform.

    Outputs PDF, DOCX, XLSX, email, e-sign documents Template Word Also reads Salesforce
    On request
  10. 10
    Aspose.Words products.aspose.com

    SDK. Developer Small Business license $1,679 perpetual.

    Outputs PDF, DOCX, HTML, Markdown Template Word
    On request
  11. 11
    Legito legito.com

    Smart document and contract automation.

    Outputs DOCX, PDF, e-sign documents Template Visual builder, Word Also reads built-in forms
    Not published free tier
  12. 12
    ActiveDocs activedocs.com

    Word-based enterprise document generation.

    Outputs DOCX, PDF, e-sign documents Template Word
    On request
12 of 22 shown Show the other 10Hide the other 10
  1. 13
    docassemble docassemble.org

    MIT guided-interview and document assembly.

    Outputs PDF, DOCX Template Word, PDF form Also reads built-in forms
    Free
  2. 14
    HotDocs mitratech.com

    Owned by Mitratech. Desktop and cloud.

    Outputs DOCX, PDF Template Word Also reads built-in forms
    On request
  3. 15
    PDF4me pdf4me.com

    Ynoox GmbH. Generate Documents endpoint.

    Outputs PDF, DOCX Template Word Also reads Zapier/Make/n8n
    Not published free tier
  4. 16
    Adobe Document Generation API developer.adobe.com

    Part of Adobe PDF Services.

    Outputs PDF, DOCX Template Word
    On request free tier
  5. 17
    Docupilot Editor's pick via Zapier docupilot.com

    Starter $29/mo, 100 docs.

    Outputs PDF, DOCX, PPTX, XLSX, e-sign documents Template Word, Visual builder Also reads Airtable, Zapier/Make/n8n, built-in forms
    $29 / mo
  6. 18
    Gavel Editor's pick via Zapier gavel.io

    Formerly Documate (Documate Inc. dba Gavel).

    Outputs DOCX, PDF Template Word, PDF form Also reads built-in forms, Zapier/Make/n8n
    $83 / mo
  7. 19
    Documentero via Zapier documentero.com

    Micro $19.50/mo shown; price formatting unclear on page.

    Outputs DOCX, XLSX, PDF Template Word Also reads Google Sheets, CSV, Excel, Zapier/Make/n8n +1
    $19.50 / mo
  8. 20
    Crove via Zapier crove.app

    Individual $33/mo billed $390/yr.

    Outputs PDF, DOCX, e-sign documents Template Word, Visual builder Also reads built-in forms, Zapier/Make/n8n
    $33 / mo
  9. 21
    DocuGenerate via Zapier docugenerate.com

    Word templates plus JSON.

    Outputs PDF, DOCX Template Word Also reads Coda, Zapier/Make/n8n
    $19 / mo, cheapest here
  10. 22
    PandaDoc Editor's pick pandadoc.com

    Adjacent proposal and e-sign suite.

    Outputs PDF, e-sign documents, DOCX Template Visual builder Also reads HubSpot, Salesforce, Pipedrive, Zapier/Make/n8n G2 4.7 (3324)
    $19 / mo

What differs for JSON API

For contracts delivered as DOCX, templates are built in Word (21), a visual builder (5) and a fillable PDF form (3). Among them, 5 need Zapier, Make or n8n to read JSON sent to an API, so they sit after the tools with a direct connection. Of these, 11 have a free tier.

Besides DOCX, these tools for contracts also write PDF (21), e-sign documents (8) and XLSX (6). Your own code decides when to call the API, so a document can be built on any event. Published starting prices run from $19 to $250 a month, the top end from Formstack Documents. Prices were checked on 20 Oct 2026.

Nearby pages

Broader list: JSON API to DOCX (29 tools).

Related lists: JSON API to DOCX for letters (15 tools), JSON API to DOCX for reports (15), JSON API to DOCX for invoices (13), JSON API to DOCX for proposals (7), JSON API to PDF for contracts (32), JSON API to XLSX for contracts (6), JSON API to PPTX for contracts (5).

How to generate PDFs from a JSON API: a step-by-step guide, updated 21 Oct 2026.

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